Why do Relays switching capacity vary with the type of load?
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 load||Inductive load (cos Φ = 0.4, L/R = 7 ms)|
|Rated load||220 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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