ABB OT125F3 Disconnect Switch Brand: ABB. Part Number: OT125F3. ABB Disconnect Switch, Front Operated Non-Fusible Open, Series: OT Series, 600 VAC, 125 A, 50 hp, 50/60 Hz, 3 Pole, 3.6 kA Short Circuit, Base Mount, Screw Terminal, 40 deg C, 70 mm H x 100 mm W x 74 mm D. Additional Description: ABB -OT125F3 (O) SWITCH NF 3P 125A UL98 NON-RETURNABLE , NON-CANCELLABLE. Catalog Description: 3-pole, front operated, base mounted, DIN-rail mountable switch-diconnector / non-fusible diconnect switch with front protected clamp terminals, handle and shaft are not included..