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All electric motors have a lifespan, and to keep them running efficiently and safely they must be protected. One of the main causes of failure is electrical overload, sometimes called overcurrent. When a motor draws more current than it is designed to handle it causes the temperature to build-up resulting in overheating. This damages motor windings and coils. It is important to protect the motor and its circuit, and this is where the use of contactor overload relays can help.RS offer an extensive range of high-quality contactor overload relays from leading industry brands including Schneider Electric, Siemens, ABB, Eaton, Lovato, and Rockwell Automation.

### What is overload protection?

Overload is where a motor draws a high current above its rated value for an extended amount of time. Overload causes overheating of the motor causing damage. To prevent this from happening devices such as contactor relays are specifically designed for industrial control motor protection. They are used with contactors as part of a motor starter or in a control panel or centre.

### What are the different types of contactor overload relays?

The motor protection devices can be classified into two main types which are thermal types and electronic types.Thermal overload relaysUtilise a bi-metallic plate located near a heating element. When excessive current is passed through the heating element N/C (Normally Closed) contacts switch over and opens contacts. This interrupts power from flowing to the contactor's control circuit. Thermal overloads usually offer an adjustable current range as well as a manual or automatic reset option.Electronic RelaysElectronic overload relays don't have a bi-metallic mechanism, Instead, they work by using components such as temperature sensors to measure the load current. They are generally more accurate than thermal devices and they usually have a wider current range, a selectable trip class provides enhanced trip protection against single phasing against the motor.



Shop our range of Contactor & Control Relay Overloads supplies & accessories. Free Next Day Delivery.

Contactor & Thermal Overload Relays | RS

Contactor Overload Relays

Buy from our selection of contactor overload relays from Abb. At RS, we strive to give you the best offers from our supplier and to promptly deliver in the shortest time.

Abb Contactor Overload Relays | RS

Buy from our selection of contactor overload relays from Lovato. At RS, we strive to give you the best offers from our supplier and to promptly deliver in the shortest time.

Lovato Contactor Overload Relays | RS

Buy Eaton Contactor Overload Relays from RS. Browse the latest Contactor Overload Relays by Eaton. With free next day delivery!

Eaton Contactor Overload Relays | RS

Buy Allen Bradley Contactors. Browse our latest Allen Bradley Safety Relay offers. Free Next Day Delivery.

Allen Bradley Contactors | RS

Rockwell Automation Contactors are very versatile, and are used as switches in everything from lighting circuits to motors. They are designed to be connected to high current devices, so it is imperative to choose a reliable part to ensure the efficiency and longevity of your system. Rockwell Automation Contactors are a relay you can trust. Rockwell Automation are a renowned name in automation and control applications. From every aspect of machine processes, Rockwell Automation provide safe, reliable components. Efficiency and safety are at the heart of Rockwells offer, with high quality and reliable parts to suit the most demanding industries. Rockwell Automation combine with RS Components customer first attitude to get you the parts you need in the timeframe you need them. For a service you can trust.

Allen Bradley Contactors

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