DEHNconnect SD2 Ex (i)

Terminal block with integrated surge protection

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

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

Slots for jumper bars – for quickly connecting signal circuits.

lorem ipsum — Slots for jumper bars – for quickly connecting signal circuits.

Disconnection module with ejector – for disconnecting the signal circuits.

Marking of the protected side – minimises wiring errors.

Terminals with direct plug-in technology – fast and vibration-proof connection without tools.

DCO SD2 MD EX

Surge arrester with energy-coordinated low-capacitance protective circuit and disconnection module for disconnecting signal circuits. For protecting one pair in intrinsically safe measuring circuits and bus systems, meets FISCO requirements. Self-capacitance and self-inductance negligibly small. Insulation strength > 500 V to earth.

1 Product

Part No. 917960 DCO SD2 MD EX 24

GTIN 4013364150638, Customs tariff No. (EU): 85363010, Gross weight: 43.10 g, PU: 1.00 Stk

Predecessor

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Additional information

CAD files

Surge arrester EX DCO SD2 MD EX 24
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, Ex (i) version
Complies with FISCO requirements
Two-pole terminal with direct plug-in technology
Width: 6 mm
Signal interruption via plug-in module
Nominal voltage: 24 V
Max. continuous operating voltage (d.c.): 33 V
Max. input current according to EN 60079-11: 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 EX 24
Part No.: 917960
or equivalent.

Certificates

Technical data

SPD class	T
Max. continuous operating voltage (d.c.) (U_C )	33 V
Max. input current according to EN 60079-11 (I_i )	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 )	5.8 MHz
Approvals	UL, CSA, ATEX, IECEx, CSA & USA Hazloc, SIL
*⁾ For more detailed information, please visit www.dehn-international.com.

SPD class	T
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
Max. input voltage according to EN 60079-11 (U_i )	30 V
Max. input current according to EN 60079-11 (I_i )	0.5 A
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 )	≤ 1500 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 )	≤ 1400 V
Series resistance per line	1.8 ohms
Cut-off frequency line-line (f_G )	5.8 MHz
Capacitance line-line (C)	≤ 1.0 nF
Capacitance line-PG (C)	≤ 8 pF
Operating temperature range	-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	blue
Test standards	IEC 61643-21 / EN 61643-21
Approvals	UL, CSA, ATEX, IECEx, CSA & USA Hazloc, SIL
SIL classification	up to SIL3 *⁾
ATEX approvals	DEKRA 12ATEX0261 X: II 2(1) G Ex ia [ia Ga] IIC T4,T5,T6 Gb
IECEx approvals	DEK 12.0076X: Ex ia [ia Ga] IIC T4...T6 Gb
CSA & USA Hazloc approvals (1)	70111035: Class I Div. 1; Class I Zone 1
CSA & USA Hazloc approvals (2)	70111035: AEx ia [ia] IIC T4 ... T6
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 )	≤ 1400 V
*⁾ For more detailed information, please visit www.dehn-international.com.

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DEHNconnect SD2 Ex (i)

Details

DCO SD2 MD EX

Part No. 917960 DCO SD2 MD EX 24

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DEHNconnect SD2 Ex (i)

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DCO SD2 MD EX

Part No. 917960 DCO SD2 MD EX 24

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