1SFN034403R1000

The ABB VM140/190, Ordering Code 1SFN034403R1000, is a heavy-duty mechanical interlocking accessory used with ABB AF-series block contactors. It is designed to mechanically connect two contactors and prevent both devices from closing simultaneously.

This type of interlocking is important in control circuits where simultaneous contactor operation could cause an electrical or mechanical conflict. Typical applications include forward/reverse motor starters, changeover contactor systems, reversing circuits, industrial motor control panels, MCC panels, machine automation panels and OEM electrical assemblies.