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 Imax 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)


Disconnection module with ejector – for disconnecting the signal circuits.
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Slots for jumper bars – for quickly connecting signal circuits.
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Terminals with direct plug-in technology – fast and vibration-proof connection without tools.
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Marking of the protected side – minimises wiring errors.
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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.: 85363010, Gross weight: 43.10 g, PU: 1.00 pc(s)



Additional information

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.



Technical data

SPD class T
Max. continuous operating voltage (d.c.) (UC ) 33 V
Max. input current according to EN 60079-11 (Ii ) 0.5 A
D1 Lightning impulse current (10/350 µs) per line (Iimp ) 1 kA
C2 Total nominal discharge current (8/20 µs) (In ) 10 kA
Cut-off frequency line-line (fG ) 5.8 MHz
Approvals UL, CSA, EACEx, ATEX, IECEx, SIL

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