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Automatically operated electrical switch designed to protect an electrical circuit from damage caused by excess current from an overload or short circuit.

A device that interrupts excessive current by melting a metal wire or strip to prevent damage to a circuit.

A device often built into motors or transformers that shuts the system down if it gets too hot.

Breaks the circuit when it detects an unintended electrical arc to prevent electrical fires.

Protects electrical devices from voltage spikes by blocking or shorting to ground voltages above a safe threshold.

Protects against electric shock by breaking the circuit when a difference in currents between hot and neutral wires occurs.

Maintains a constant voltage level to electrical equipment regardless of fluctuations in input voltage.

Protects motors by sensing an overload condition and interrupting power flow to the motor.

Protects electrical power systems from damages by directing lightning surge voltages to the ground.