These types of relays consist of bimetallic elements, which are individually calibrated and tested for optimum protection of motors against overloads. The tripping curve shows the inverse time characteristic of all bimetallic relays starting from cold condition. Once the realy is tripped due to overload it cannot be reset immediately as the relay has a specific reset time. Resetting is done maually. Wide range of relays are available depending on various ac loads.

Offers ghd overload relays. Ghd type overload relays are compact in design. They also have bimetallic elements, which are calibrated and tested for precise operation. Their tripping curve is similar to gk-1 type of relays except that they operate on differential mechanism technique. Resetting of ghd relay can be done both manually or automatically. Range (0.3 - 0.48a) to (22 - 30a) ghd contactors these heavy-duty contactors have a robust construction and are designed for trouble free and long operation life. They can withstand high ambient, humidity, under voltage conditions and frequent starts.