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20 July, 04:25

If a fuse or circuit breaker directly opens a circuit when the current limit is reached, do overload heaters open and break the circuit when their current limit is reached?

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  1. 20 July, 06:09
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    No

    Explanation:

    No, overload heaters do not open to break the circuit when their current limit is reached. These are safety device to prevent over heating.

    Thermal overload relays in a motor are intended to protect the conductors (windings). Such safety devices are made to maintain the current flow in a circuit at a safety level so as to avoid overheating of the circuitry conductors. And the excess of current is often called as over current.
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