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?

Question

Vivian Henry

Physics

1 September, 21:01

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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Answers (1)

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Rigoberto Boyle · Answer 1

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.