This is a Murr Elektronik 3-position Switching Relay, with a switching capacity of 20A @ 110/127VAC & 10A @ 250VAC. It is equipped with one changeover contact, a voltage-resistant terminal for switching, and a reset button for manual actuation. The unit features a transparent front cover with a key-lock for secure operation, along with short-circuit, overload, and reverse polarity protection to ensure safe operation.