ABB XT4SU3150AFF000XXX, XT4S series, molded case switch-disconnector, 250 A frame, TMF trip unit, lifecycle stage current.
This is a non-adjustable trip unit, so the protection curve is set at the factory. For a buyer specifying this into a BOM, the 250 A frame and fixed trip mean the part is selected for a specific load current and coordination study; it is not field-adjustable for different ampacities.
Within the XT4S series, the closest alternative would be a variant with a different trip unit type (e.g., electronic trip) or a different frame size. The TMF fixed-trip unit is specific to this order code; a direct pin-compatible alternative would require matching the 250 A frame and the same mounting footprint. The evidence does not list a specific successor or alternate MPN, so verify the trip curve and physical dimensions against your existing installation before substituting.
We source this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quotation — submit an RFQ for a firm quote and lead time.
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