Overload switches

Overload Switches for Motor Protection

Overload switches are essential safety devices used to protect electric motors from overheating, excessive current draw, and potential damage. Commonly fitted within motor control systems, they help prevent costly breakdowns, reduce downtime, and support safer, more reliable operation across a wide range of industrial applications.

When a motor is running, it draws electrical current in line with the load placed upon it. Brief increases in current are normal, particularly during start-up, but prolonged overcurrent can cause excessive heat build-up in the motor windings and internal components. Overload switches are designed to detect these conditions and disconnect power before serious damage occurs.

In many systems, overload switches are used alongside contactors, starters, and other motor control equipment. If an overload condition is detected, the switch trips and interrupts the electrical supply to the motor, helping to prevent further strain on the system. Once the fault has been identified and resolved, the overload switch can usually be reset either manually or automatically, depending on the model.

Common Uses of Overload Switches

• Protection for compressor motors and compressed air systems
• Motor starters and electrical control panels
• Pumps, fans, blowers, and industrial machinery
• Applications where prolonged overcurrent may cause overheating

Choosing the correct overload switch is important for maintaining motor performance, improving operational reliability, and extending equipment life. The right protection device can help reduce maintenance costs and minimise the risk of unexpected failures.

At Compressed Air Systems UK, we supply overload switches for a variety of industrial and compressed air applications. If you need help selecting the correct overload protection device, call our team on 01217 533330 for expert advice.