A relay that opens or closes contacts with a bending mechanism as a result of the difference in the expansion coefficients of a bimetal, which is heated by the current . The thermal relay switches a magnetic contactor to protect a motor from overload. Specifications: Voltage: 220V Usage: General Purpose Contact Load: High Power Power Source: AC Model Number: NR4-30 25A -36A Protect Feature: Sealed Theory: Thermal Relay Package Includes: 1 x Thermal relay NR4-30 25A -36A thermal overload protection relay