Which machine is better to put to protect the engine from short circuit?

Hello, I have a 7.5kW motor, a current of 10 to 15 A in the load. Which machine is more correct to set? ABB MS116-16 (Automatic circuit breaker for motor protection against short-circuit and thermal overload 10.0 ... 16.0A 16kA) or ABB MS116-20 (Automatic circuit breaker for engine protection against short-circuit and thermal overload 16.0 ... 20.0A 10kA)?

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Posted: Updated: 16.11.2017 1 comment
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  • Admin
    07/31/2017 at 19:35

    The thermal relay is selected at 15-20% of the rated current. The rated current is indicated in the passport or plate on the motor housing. It is advisable that the resulting overload current (thermal) is not in the extreme limits of the setting. Therefore, find out the rated current, otherwise there will be no sense from the relay.

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