Specifications

Product Type Fuse Switch Disconnector	Brand ABB	Series OS250B
Application Isolation and protection in low-voltage distribution systems (industrial / commercial feeders, motor circuits)

Max. Rated Operation AC Voltage (Ue) 690V AC	Position of Line Terminals Top in / Bottom out or reverse	Rated Impulse Withstand Voltage (Uimp) 12kV
Rated Insulation Voltage (Ui) 1000V	Rated Operating Voltage 690V AC	Rated Operation Power at AC-23, 400 V 140kW
Rated Operational Current AC21-A (Ie) 250A	Rated Operational Current AC22-A (Ie) 250A	Rated Operational Current AC23-A (Ie) 250A
Rated Permanent Current at AC-21, 400 V 250A	Rated Short Time Withstand Current (Icw) 8kA (1 s)	Rated Uninterrupted Current (Iu) 250A
Power Loss 17W	Rated Current (In) 250A	Rated Frequency 50/60Hz
Fuse Size B1-B3	Mechanical Life ~16,000 operations	No. of Poles 3P

Housing Material

Reinforced thermoplastic

Padlockable

Yes (OFF position)

Depth 154mm	Height 193mm	Weight 4.1kg
Width 208mm

Rated Surrounding Temperature Without Derating 40°C	Pollution Degree 3	Storage Temperature -40°C to 70°C
Operating Temperature -25°C to 55°C	IP Rating IP20

Standards and Approvals

IEC 60947-3, CE, RoHS

ABB OS250B12P Switch Fuses 3-P 250A For: B1-B3 Shape 1000VAC 250 kW Lug Terminal IP65