Page top

Lead Contents

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.

Recommended Products

MY

Best-selling, general-purpose relays that can be selected based on operating environment and application

LY

Power-switching Compact General-purpose Relays

G3PE (Three-phase)

Compact, Slim-profile SSRs with Heat Sinks. Solid State Contactors for Three-phase Heaters Reduced Installation Work with DIN Track Mounting.

Other General Purpose Relays FAQ