Switch fuse disconnector OS125GD12K 3-pole 125A

The OS125GD12K is a three-pole switch-disconnector fuse unit engineered for industrial and commercial applications requiring reliable circuit protection and isolation. Designed to comply with IEC 60947-3 standards, it accommodates DIN fuse systems compatible with NH000/NH00 sizes, ensuring flexibility for various operational environments. Rated for 690V AC main circuit voltage and a maximum current capacity of 125A, this unit supports AC-21A, AC-22A, and AC-23A operational current ratings across multiple voltage levels. It delivers operational power up to 110 kW at 690V under AC-23A conditions.

 

Constructed with IP20 protection in accordance with IEC 60529, the OS125GD12K is suitable for indoor installations subjected to pollution degree 3 conditions. Its base-mounted configuration features top-in/bottom-out or bottom-in/top-out terminal arrangements using durable lug terminals with a tightening torque range of 15–22 N·m. The front-operated mechanism includes a direct-mounted handle designed for ease of operations while ensuring safety compliance.

 

Key technical attributes include an impulse withstand rating of 8 kV, short-time withstand current capacity of up to 5 kArms (1 second), rated conditional short-circuit currents of up to 100 kA at 500V or up to 80 kA at higher voltages (690V). With minimal per-pole power loss rated at just 4W during operation, the device provides energy-efficient performance critical for demanding electrical systems.

 

The unit measures compactly at a net width of 190 mm, height of 170 mm, depth/length of 210 mm, and weighs approximately ~2 kg—a design optimized for ease in handling and installation within control panels or distribution systems. Additionally compliant with RoHS directive EU2011/65/EU (and amendment July22/2019), it meets modern environmental standards without compromising on technical robustness required by professional buyers in engineering-focused supply chains.