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FAQ02771 of General Purpose Relays FAQ

FAQ No. FAQ02771

Primary Contents

Question

Why do Relays switching capacity vary with the type of load?

Answer



Generally, the switching capacity for an inductive load will be lower than the switching capacity for a resistive load due to the influence of the electromagnetic energy stored in the inductive load.

Example: MY2 General-purpose Relays

Resistive loadInductive load (cos Φ = 0.4, L/R = 7 ms)
Rated load220 VAC, 5 A
24 VDC, 5 A
220 VAC, 2 A
24 VDC, 2 A

When AC inductive loads are used, an inrush current of 5 to 10 times (varies with load) the steady-state current will be generated.
For DC inductive loads, 5 to 10 times (varies with load) the counter electromotive force is generated.
Allow for a margin when selecting Relays.

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