OS250D12K SWITCH FUSE

 

The OS250D12K is a high-performance 3-pole switch fuse assembly engineered to meet demanding industrial applications. Designed in compliance with IEC 60947-3 standards, it supports reliable operation in circuits up to a rated operational voltage of 690 V AC and a maximum current capacity of 250 A. The unit enables effective overcurrent protection via its DIN-standard NH0/NH1 fuse system, making it suitable for diverse electrical environments.

 

Featuring base mounting and front-operated accessibility, the OS250D12K ensures user-friendly installation and operation. The direct-mounted handle enhances operational control while maintaining compactness. Its lug terminals, with a width of 25 mm, provide robust connections requiring tightening torque between 30 and 44 N·m.

 

Electrical performance highlights include conventional free-air thermal current (Ith) ratings at Θ = 40 °C of up to 250 A and a conditional short-circuit current rating of (690 V) 100 kA. Rated operational power spans from (220–240 V) at 75 kW to (690 V) at an impressive output of 250 kW under AC-23A utilization categories. Additionally, this switch fuse offers superior insulation capabilities with Ui rated at up to 1000 V and Uimp surge withstand ratings of up to 12 kV.

 

Physically robust yet compact, the unit measures H270 x W310 x D200 mm with a net weight of approximately 4 kg. Its IP20 degree-of-protection classification per IEC60529 ensures suitability for controlled industrial environments where contamination levels align with Pollution Degree 3 specifications.

 

The OS250D12K excels in efficiency through minimal power loss—just 17 W—at full load conditions while retaining consistent long-term reliability within harsh operating conditions. It is ideal for applications requiring secure line-terminal configurations such as Top In - Bottom Out or Bottom In - Top Out orientations suited for modular systems or panel installations across sectors including marine, oil & gas, infrastructure projects, and automated facilities demanding precision-built circuit protection solutions.