B100 Series, NEMA 1 Enclosed, Pushbutton Operator, Manual Motor Starter. Provides Manual Control and Overload Protection, Includes a 3-Pole BiMetallic Overload Relay, Field Mounted Auxiliary Contacts, Lockout Device Standard, Frame Size M-0. 1 Hp @ 120V AC 1-Phase, 2 Hp @ 240V AC 1-Phase. 3 Hp @ 230V AC 3-Phase, 5 Hp @ 575V AC 3-Phase. Heater Unit Not Included; uses the FH Series.