TAD1U is a part of the Macromatic family of robust industrial relays, designed for use in a wide range of industrial applications. The TAD1U AC relay has a multi-position line selectable switch for verifying control functions, an LED indicating coil power is on, and a molded plastic housing with a removable locking cover and recessed terminals for easy wiring. It is UL recognized and CSA approved, and its design allows it to be used in both AC and DC applications. It is suitable for controlling residential and light commercial HVAC equipment, HVAC systems, pumps, fans, motors, and many other applications.