The 1SFA611920R8019 is a ABB Contact Block for use with devices including contactors, manual motor starters, pushbuttons, cam switches, switches, timers, and relays. It has a contact block rating of 10A at 277V AC, 1HP at 120V AC, 2HP at 240V AC, 6A at 250V DC, and 5A at 28V DC. The Contact Block also has a front knob to lock the contacts in position when pushed.