Integration Notes
The 3RB1257-0KB01: Mounts in size S10/S12 contactor assemblies or individually. Main circuit uses busbar connection — plan for busbar taps rather than cable lugs. Auxiliary wiring is screw-terminal, accepts standard ferruled stranded conductors. The DC 24 V control supply powers the reset solenoid and ground-fault signaling; verify polarity and free-wheel diode on the coil if retrofitting into an existing panel.