Aumov LV Ultramov Varistor Design Guide Page 18 Varistor Design Guide For DC & Automotive Applications

2015 Littelfuse DC Application Varistor Design Guide www.littelfuse.com DC Application Varistor Design Guide Introduction to Metal Oxide Varistors (MOVs) How to Connect a Littelfuse Varistor Transient suppressors can be exposed to high currents for short durations (in the range of nanoseconds to milliseconds). Littelfuse varistors are connected in parallel to the load, and any voltage drop in the leads to the varistor will reduce its effectiveness. Best results are obtained by using short leads to reduce induced voltages. DC Applications DC applications require connection between plus and minus or plus and ground and minus and ground. For example, if a transient towards ground exists on all three phases (common mode transients), only transient suppressors connected phase to ground would absorb energy. Transient suppressors connected phase to phase would not be effective. COMMON MODE TRANSIENT Incorrect Correct Introduction to Metal Oxide Varistors (MOVs) 17

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