S-IR thermal relays can be fitted into corresponding S-ID or S-IDX contactors,
or with use of a special mounting device,
mounted beside them on their own.
Relays wearing K-ERB symbol are used to protect electric machinery against overloads occuring during their continuous work,
while K-ERS relays protect devices against the effects of short circuit.
As the short-circuit protection they break the circuit,
while the overvoltage release activates the breaker switch if short-circuit current flows through the relay.
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