1SFN034700R1000

The ABB VM300H, Product ID 1SFN034700R1000, is a heavy-duty mechanical interlocking accessory designed for two horizontally mounted ABB contactors. Its primary purpose is to physically prevent simultaneous closing of both contactors, making it suitable for electrical control arrangements where two switching devices must never operate together.

The VM300H can be used with AC- or DC-operated contactors of the same or different ratings, provided the selected combination complies with ABB’s compatibility table. This makes it particularly useful in forward/reverse motor starters, changeover contactor assemblies, star-delta or transfer arrangements, industrial motor-control panels, MCCs, machinery control panels and OEM automation systems.