Switch fuse disconnector OS400D12K 3-pole 400A

The OS400D12K Switch Fuse is a robust, high-performance device designed for industrial applications requiring reliable power isolation and protection. This front-operated, 3-pole unit is equipped with a direct-mounted handle for ease of operation and features base mounting for secure installation. It complies with IEC 60947-3 standards and offers an IP20 degree of protection, ensuring safe use in environments classified under pollution degree 3.

 

Rated at 400 A for conventional free-air thermal current (Ith) at 40°C and fully enclosed operation, this switch fuse supports main circuit voltages up to 690 V AC. Its rated operational power accommodates loads ranging from 132 kW at 240 V to up to 400 kW at 690 V (AC-23A classification). The device supports multiple fuse sizes (NH0/NH1/NH2) within the DIN system and offers flexibility in connection layouts with both top-in bottom-out or bottom-in top-out terminal positions.

 

Designed with lug terminals measuring 25 mm wide, it specifies tightening torque values between 30–44 N·m for secure electrical connections. The switch is engineered to handle short-circuit currents up to a rated conditional value of Inc: 100 kA (500 V) or Inc: 80 kA (690 V), as well as withstand short-time low-voltage currents of Icw:14 kiloampere rms over one second.

 

This durable solution features minimal power loss of just 36 W at full load conditions while delivering rated insulation voltage levels up to Ui:1000 V and impulse withstand capability up to Uimp:12 kV. With dimensions of L360 x W365 x H175 mm and weighing approximately ‎6.61 kg‎ net weight it integrates efficiently into diverse B2B switching needs automation or infrastructure settings