Sigma Elektrik Low Voltage Contactors are designed in accordance with IEC/EN 60947-4-1. They are used remotely to control and protect (only in combination with thermal Overload Relays) electrical motors and other electrical loads such as lamps, capacitors, transformers, pumps etc. The contactors are used together with thermal Overload relays so as to protect the circuits likely to be overloaded in operation.