SNUBBER CIRCUIT TO CONTACTOR AUXILLIARIES

CLW SPEC NO. CLW/ES/3/0202

              Introduction:

Switching of any voltage across an inductive load results in high reverse voltage build-up giving rise to transients This causes Electromagnetic Interference (EMI) in associated circuitry which might lead to malfunctioning of an electrical system. In a locomotive this might result in troubleshooting of a vital circuitry or damage  to a critical semi-conductor that might cause undesired halting of the locomotive causing manifold problems. Hence it is an important precaution  to  arrest   such   interference   at   the   very   source   to   ensure smooth locomotive operation. A Varistor is a device which can absorb such unwanted electrical disturbances without affecting the normal operation  of  the  circuit  which   the   Varistor   guards   against Electromagnetic Interference (EMI) for trouble-free operation. The Varistor is encapsulated in flame-proof plastic to make it immune to dust and humidity and also fire-proof.