DEHNconnect SD2

Terminal block with integrated surge protection

For protecting measuring and control circuits and bus systems
Maximum impulse current carrying capability I_max up to 20 kA (8/20 µs)
Low voltage protection level, capable of protecting terminal equipment

Modular disconnection function

Disconnection module for disconnecting the signal circuit for maintenance work
Module fixing and mechanical ejector
Module in "parked" position after disconnection

Space-saving and function-optimised design

Terminal block with integrated surge protection (width of 6 mm)
Fast conductor connection without tools thanks to direct plug-in technology
Can be used with jumper bar (accessory)

Details

Terminals with direct-plug-in technology – fast and vibration-proof connection.

lorem ipsum — Terminals with direct-plug-in technology – fast and vibration-proof connection.

Marking of the protected side – minimises wiring errors.

Slots for jumper bars – for quickly connecting signal circuits.

Disconnection module with ejector – for disconnecting the signal circuits.

DCO SD2 ME

Energy-coordinated surge arrester with disconnection function for protecting two single lines sharing a common reference potential as well as unbalanced interfaces.

3 Products

Part No. 917920 DCO SD2 ME 12

GTIN 4013364150560, Customs tariff No. (EU): 85363010, Gross weight: 42.38 g, PU: 1.00 Stk

Predecessor

Images

Additional information

CAD files

Coordinated DCO SD2 ME 12 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting two single cores or one pair
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 14 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 ME 12
Part No.: 917920
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	14 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-PG (f_G )	2.5 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	12 V
Max. continuous operating voltage (d.c.) (U_C )	14 V
Max. continuous operating voltage (a.c.) (U_C )	9.5 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 60 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 50 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 36 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 19 V
Series resistance per line	1.8 ohms
Cut-off frequency line-PG (f_G )	2.5 MHz
Capacitance line-line (C)	≤ 1.2 nF
Capacitance line-PG (C)	≤ 2.4 nF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 19 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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Part No. 917921 DCO SD2 ME 24

GTIN 4013364150577, Customs tariff No. (EU): 85363010, Gross weight: 42.38 g, PU: 1.00 Stk

Predecessor

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Additional information

CAD files

Coordinated DCO SD2 ME 24 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
for protecting two single cores or one pair
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 33 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 ME 24
Part No.: 917921
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	33 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-PG (f_G )	6 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	24 V
Max. continuous operating voltage (d.c.) (U_C )	33 V
Max. continuous operating voltage (a.c.) (U_C )	23 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 120 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 75 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 90 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 45 V
Series resistance per line	1.8 ohms
Cut-off frequency line-PG (f_G )	6 MHz
Capacitance line-line (C)	≤ 0.5 nF
Capacitance line-PG (C)	≤ 1.0 nF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 45 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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Part No. 917922 DCO SD2 ME 48

GTIN 4013364150584, Customs tariff No. (EU): 85363010, Gross weight: 42.29 g, PU: 1.00 Stk

Predecessor

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Additional information

CAD files

Coordinated DCO SD2 ME 48 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting two single cores or one pair
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 55 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 ME 48
Part No.: 917922
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	55 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-PG (f_G )	7.5 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	48 V
Max. continuous operating voltage (d.c.) (U_C )	55 V
Max. continuous operating voltage (a.c.) (U_C )	38.5 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 180 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 110 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 150 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 75 V
Series resistance per line	1.8 ohms
Cut-off frequency line-PG (f_G )	7.5 MHz
Capacitance line-line (C)	≤ 0.3 nF
Capacitance line-PG (C)	≤ 0.6 nF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 75 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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DCO SD2 MD

Energy-coordinated surge arrester with disconnection function for protecting one unearthed pair as well as balanced interfaces.

3 Products

Part No. 917940 DCO SD2 MD 12

GTIN 4013364150591, Customs tariff No. (EU): 85363010, Gross weight: 42.42 g, PU: 1.00 Stk

Predecessor

Images

Additional information

CAD files

Coordinated DCO SD2 MD 12 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting galvanically isolated balanced interfaces
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 14 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 MD 12
Part No.: 917940
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	14 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-PG (f_G )	2.5 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	12 V
Max. continuous operating voltage (d.c.) (U_C )	14 V
Max. continuous operating voltage (a.c.) (U_C )	9.5 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 30 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 750 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 19 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 650 V
Series resistance per line	1.8 ohms
Cut-off frequency line-PG (f_G )	2.5 MHz
Capacitance line-line (C)	≤ 2.4 nF
Capacitance line-PG (C)	≤ 6 pF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 650 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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Part No. 917941 DCO SD2 MD 24

GTIN 4013364150607, Customs tariff No. (EU): 85363010, Gross weight: 42.44 g, PU: 1.00 Stk

Predecessor

Images

Additional information

CAD files

Coordinated DCO SD2 MD 24 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting galvanically isolated balanced interfaces
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 33 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 MD 24
Part No.: 917941
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	33 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-PG (f_G )	6 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	24 V
Max. continuous operating voltage (d.c.) (U_C )	33 V
Max. continuous operating voltage (a.c.) (U_C )	23 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 50 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 750 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 45 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 650 V
Series resistance per line	1.8 ohms
Cut-off frequency line-PG (f_G )	6 MHz
Capacitance line-line (C)	≤ 1.0 nF
Capacitance line-PG (C)	≤ 6 pF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 650 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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Part No. 917942 DCO SD2 MD 48

GTIN 4013364150614, Customs tariff No. (EU): 85363010, Gross weight: 42.35 g, PU: 1.00 Stk

Predecessor

Images

Additional information

CAD files

Coordinated DCO SD2 MD 48 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting galvanically isolated balanced interfaces
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 55 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 MD 48
Part No.: 917942
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	55 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-PG (f_G )	8 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	48 V
Max. continuous operating voltage (d.c.) (U_C )	55 V
Max. continuous operating voltage (a.c.) (U_C )	38.5 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 100 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 750 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 72 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 650 V
Series resistance per line	1.8 ohms
Cut-off frequency line-PG (f_G )	8 MHz
Capacitance line-line (C)	≤ 0.6 nF
Capacitance line-PG (C)	≤ 6 pF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 650 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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DCO SD2 MD HF

Energy-coordinated surge arrester with disconnection function for protecting balanced interfaces with extra-low voltages. Also suitable for high transmission rates due to a diode matrix with minimised capacitance. It is advisable to use SAK shield connection systems for shielded bus lines.

1 Product

Part No. 917970 DCO SD2 MD HF 5

GTIN 4013364150621, Customs tariff No. (EU): 85363010, Gross weight: 42.35 g, PU: 1.00 Stk

Predecessor

Images

Additional information

CAD files

Coordinated DCO SD2 MD HF 5 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 2 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting bus systems and interfaces with
extra low voltage, suitable for high transmission rates
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 8.5 V
Nominal current at 80 °C: 0.5 A
D1 Lightning impulse current (10/350 µs) per line: 1 kA
C2 Total nominal discharge current (8/20 µs): 10 kA

Brand: DEHN
Type: DCO SD2 MD HF 5
Part No.: 917970
or equivalent.

Certificates

Technical data

SPD class	Q
Max. continuous operating voltage (d.c.) (U_C )	8.5 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
Cut-off frequency line-line (f_G )	100 MHz
Approvals	UL, CSA, SIL, ATEX, IECEx
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	Q
Nominal voltage (U_N )	5 V
Max. continuous operating voltage (d.c.) (U_C )	8.5 V
Max. continuous operating voltage (a.c.) (U_C )	6.0 V
Nominal current at 80 °C (I_L )	0.5 A
D1 Lightning impulse current (10/350 µs) per line (I_imp )	1 kA
C2 Total nominal discharge current (8/20 µs) (I_n )	10 kA
C2 Nominal discharge current (8/20 µs) per line (I_n )	5 kA
Voltage protection level line-line for I_n C2 (U_p )	≤ 35 V
Voltage protection level line-PG for I_n C2 (U_p )	≤ 750 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 14 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 650 V
Series resistance per line	1.8 ohm
Cut-off frequency line-line (f_G )	100 MHz
Capacitance line-line (C)	≤ 25 pF
Capacitance line-PG (C)	≤ 10 pF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 00
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL, ATEX, IECEx
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 17ATEX0046 X: II 3 G Ex ec IIC T6...T4 Gc
IECEx approvals	DEK 17.0023X: Ex ec IIC T6...T4 Gc
Extended technical data:	- - - - - - - - - - - - - - - - - - - -
– Max. discharge current (8/20 µs) [1/2 - PG], [1+2 - PG] (I_max )	20 kA
– Voltage protection level line-PG at 1 kV/μs C3 after being subjected to I_max (U_p )	≤ 650 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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DCO SD2 E

Fine limiting surge protective device with disconnection function for two single lines sharing a common reference potential and unbalanced interfaces.

3 Products

Part No. 917987 DCO SD2 E 12

GTIN 4013364150645, Customs tariff No. (EU): 85363010, Gross weight: 50.31 g, PU: 1.00 Stk

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DCO SD2 E 12 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 3 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting bus systems and interfaces with
extra low voltage
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 13 V
Nominal current at 60 °C: 10 A

Brand: DEHN
Type: DCO SD2 E 12
Part No.: 917987
or equivalent.

Certificates

Technical data

SPD class	W
Max. continuous operating voltage (d.c.) (U_C )	13 V
Nominal current at 60 °C (I_L )	10 A
C1 Total nominal discharge current (8/20 µs) (I_n )	0.8 kA
Cut-off frequency line-PG (f_G )	2.3 MHz
Approvals	UL, CSA, SIL
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	W
Nominal voltage (U_N )	12 V
Max. continuous operating voltage (d.c.) (U_C )	13 V
Max. continuous operating voltage (a.c.) (U_C )	9 V
Nominal current at 60 °C (I_L )	10 A
C1 Total nominal discharge current (8/20 µs) (I_n )	0.8 kA
C1 Nominal discharge current (8/20 µs) per line (I_n )	0.4 kA
Voltage protection level line-line for I_n C1 (U_p )	≤ 50 V
Voltage protection level line-PG for I_n C1 (U_p )	≤ 25 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 36 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 18 V
Cut-off frequency line-PG (f_G )	2.3 MHz
Capacitance line-line (C)	≤ 1.3 nF
Capacitance line-PG (C)	≤ 2.5 nF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 20
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0,34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL
SIL classification	up to SIL3 *⁾
*⁾ For more detailed information, please visit www.dehn-international.com.

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Part No. 917988 DCO SD2 E 24

GTIN 4013364150652, Customs tariff No. (EU): 85363010, Gross weight: 45.43 g, PU: 1.00 Stk

Predecessor

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DCO SD2 E 24 surge arrester with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 3 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting bus systems and interfaces with
extra low voltage
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 28 V
Nominal current at 60 °C: 10 A

Brand: DEHN
Type: DCO SD2 E 24
Part No.: 917988
or equivalent.

Certificates

Technical data

SPD class	W
Max. continuous operating voltage (d.c.) (U_C )	28 V
Nominal current at 60 °C (I_L )	10 A
C1 Total nominal discharge current (8/20 µs) (I_n )	0.6 kA
Cut-off frequency line-PG (f_G )	5.5 MHz
Approvals	UL, CSA, SIL
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	W
Nominal voltage (U_N )	24 V
Max. continuous operating voltage (d.c.) (U_C )	28 V
Max. continuous operating voltage (a.c.) (U_C )	19.5 V
Nominal current at 60 °C (I_L )	10 A
C1 Total nominal discharge current (8/20 µs) (I_n )	0.6 kA
C1 Nominal discharge current (8/20 µs) per line (I_n )	0.3 kA
Voltage protection level line-line for I_n C1 (U_p )	≤ 96 V
Voltage protection level line-PG for I_n C1 (U_p )	≤ 48 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 76 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 38 V
Cut-off frequency line-PG (f_G )	5.5 MHz
Capacitance line-line (C)	≤ 0.55 nF
Capacitance line-PG (C)	≤ 1.1 nF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 20
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL
SIL classification	up to SIL3 *⁾
*⁾ For more detailed information, please visit www.dehn-international.com.

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Part No. 917989 DCO SD2 E 48

GTIN 4013364150669, Customs tariff No. (EU): 85363010, Gross weight: 50.11 g, PU: 1.00 Stk

Predecessor

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Additional information

CAD files

DCO SD2 E 48 surge protective device with disconnection function
DEHNconnect SD2 terminal block with integrated surge protection
SPD class: type 4 / P1
Tested to EN 61643-21 and
energy-coordinated according to IEC 61643-22
For protecting bus systems and interfaces with
extra low voltage
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Max. continuous operating voltage (d.c.): 58 V
Nominal current at 60 °C: 10 A

Brand: DEHN
Type: DCO SD2 E 48
Part No.: 917989
or equivalent.

Certificates

Technical data

SPD class	[
Max. continuous operating voltage (d.c.) (U_C )	58 V
Nominal current at 60 °C (I_L )	10 A
C1 Total nominal discharge current (8/20 µs) (I_n )	0.3 kA
Cut-off frequency line-PG (f_G )	8.7 MHz
Approvals	UL, CSA, SIL
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	[
Nominal voltage (U_N )	48 V
Max. continuous operating voltage (d.c.) (U_C )	58 V
Max. continuous operating voltage (a.c.) (U_C )	41 V
Nominal current at 60 °C (I_L )	10 A
C1 Total nominal discharge current (8/20 µs) (I_n )	0.3 kA
C1 Nominal discharge current (8/20 µs) per line (I_n )	0.15 kA
Voltage protection level line-line for I_n C1 (U_p )	≤ 180 V
Voltage protection level line-PG for I_n C1 (U_p )	≤ 90 V
Voltage protection level line-line at 1 kV/µs C3 (U_p )	≤ 150 V
Voltage protection level line-PG at 1 kV/µs C3 (U_P )	≤ 75 V
Cut-off frequency line-PG (f_G )	8.7 MHz
Capacitance line-line (C)	≤ 0.35 nF
Capacitance line-PG (C)	≤ 0.65 nF
Operating temperature range (T_U )	-40 °C ... +80 °C
Degree of protection	IP 20
For mounting on	35 mm DIN rails acc. to EN 60715
Connection (input / output)	spring / spring
Cross-sectional area (solid)	0.34-2.5 mm²
Cross-sectional area (flexible)	0.34-2.5 mm²
Earthing via	DIN rail / terminal
Enclosure material	polyamide PA 6.6
Colour	yellow
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, SIL
SIL classification	up to SIL3 *⁾
*⁾ For more detailed information, please visit www.dehn-international.com.

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DEHNconnect SD2

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DCO SD2 ME

Part No. 917920 DCO SD2 ME 12

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Part No. 917921 DCO SD2 ME 24

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Part No. 917922 DCO SD2 ME 48

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DCO SD2 MD

Part No. 917940 DCO SD2 MD 12

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Part No. 917941 DCO SD2 MD 24

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Part No. 917942 DCO SD2 MD 48

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DCO SD2 MD HF

Part No. 917970 DCO SD2 MD HF 5

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DCO SD2 E

Part No. 917987 DCO SD2 E 12

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Part No. 917988 DCO SD2 E 24

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Part No. 917989 DCO SD2 E 48

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DEHNconnect SD2

Details

DCO SD2 ME

Part No. 917920 DCO SD2 ME 12

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Part No. 917921 DCO SD2 ME 24

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Part No. 917922 DCO SD2 ME 48

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DCO SD2 MD

Part No. 917940 DCO SD2 MD 12

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Part No. 917941 DCO SD2 MD 24

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Part No. 917942 DCO SD2 MD 48

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DCO SD2 MD HF

Part No. 917970 DCO SD2 MD HF 5

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DCO SD2 E

Part No. 917987 DCO SD2 E 12

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