ABB OT25FT3 Disconnect Switch Brand: ABB. Part Number: OT25FT3. ABB Disconnect Switch, Front Operated Non-Fusible, Series: OT SwitchLine, 600 VAC, 25 A, 20 hp, 3 Pole, NEMA 1/3R/4/4X/12 Enclosure, Door Mounting, Screw Terminal, 43 mm H x 54 mm W x 52 mm D Dimensions. Additional Description: ABB -OT25FT3 (O) ROTARY DISCONNECT, 480VAC, WITH. Catalog Description: 3-pole, front operated, door mounted switch-diconnector / non-fusible diconnect switch with protected clamp terminals, handle is not included..