The Siemens 3RH2122-1BG40 is a panel mount NEMA contactor with a maximum amperage of 10A and coil voltage of 125V. It has 2 normally open and 2 normally closed contacts, and is designed for use with 3-phase AC/DC current. The item dimensions are 2.25" x 1.75" x 2.875" and it comes packaged in a box.