An overload protection switch is a ship-type switch for overcurrent protection.

The principle is that when the circuit experiences an overcurrent, the current passes through a current detection coil, generating a magnetic field that unlocks the overcurrent trip device. Under the action of spring force, the trip device disconnects the circuit, achieving overload (overcurrent) protection. This can protect your wires and equipment from being damaged or burned.

Another type, which is the BD and BC series overload protection switches we produce, disconnects the circuit by means of a temperature-sensitive metal strip that springs up. When the current passing through exceeds the rated current, the metal strip will automatically spring up due to heating, contacting the contact points and disconnecting the connected circuit, thus providing protection for electrical equipment.