How to rate the braking contactors?

The braking contactor is switched on or off via a control contact of the braking device (no-load switching).
When selecting the braking contactor, it must be ensured that the contacts are able to carry the maximally occurring braking current (nominal/rated device current). Therefore, the value “conventional thermal current”(Ith) is decisive when selecting the braking contactor.
If this value is not indicated, the rated operational current for AC1-operation may be used instead.

Advice: By connecting contacts in parallel it is often possible to use a lower-priced contactor of a smaller design.