Surge arresters for LV power supplies
February 2009
Electrical Power & Protection
DEHN’s DEHNrail M pluggable Type 3 surge arresters combine safety and easy handling in one small module providing high performance against common mode and differential mode interferences. The modular two-pole, surge arresters are designed to protect the LV power supply of industrial electronic devices against surges in switchgear installations.
Consisting of a base element and plug-in protection module, DEHNrail M provides increased safety due to the Y-protection circuit, a combined control device and approved disconnection mechanism. A coding system on the base of the unit indicates the type and module, eliminating wrong supply and ensuring the correct choice of product.
Designed for 35 mm DIN rails, DEHNrail M devices provide input and output terminals for series connection in circuits up to 25 A. They adapt to the cable run upstream of the terminal equipment without requiring additional terminal blocks for the outgoing cables. In addition to the standard visual indication with a green and red light, the devices provide a two-pole terminal for remote signalling.
A locking system connects the module and base firmly in place, neither vibrations during transport nor the electromagnetic forces of discharge can loosen the connection. If the protective circuit is overloaded, the module’s release button allows quick exchange of the device. Both the operating state and fault indication are shown by a mark in the inspection window.
For more information contact Paul van As, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
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