ABB S800S-UC Miniature Circuit Breaker, 4-Pole, 40A, UC-K, 1000 V dc DC, 50 kA Breaking Capacity

This miniature circuit-breaker is designed to protect DC electrical circuits by interrupting fault currents in industrial installations. It operates with a four-pole configuration and a specific tripping characteristic suited to DC applications, providing controlled disconnection where high DC voltages are present. The device is built for panel or system integration in controlled-environment switchgear where finger-safe protection is required.

• 50kA breaking capacity limits fault energy and protects upstream equipment
• UC-K tripping characteristic provides predictable DC fault response
• Screw terminals enable straightforward secure conductor connections
• Reset I/O actuator allows visible manual switching and resetting
• IP20 enclosure rating ensures Basic finger protection in cabinets

• Suitable for DC solar array string protection up to 1000V
• Used with industrial control gear requiring four-pole isolation
• Ideal for battery-bank distribution systems
• Can be used for protecting motor-drive DC supply rails
• Used for sectionalising DC busbars in commercial installations

It provides four poles to isolate all conductors simultaneously for complete circuit disconnection.

It interrupts fault currents up to 50kA breaking capacity to reduce thermal and mechanical stress on installations.

Screw terminals are provided to secure conductors using standard screw-tightening methods.

A reset I/O actuator is fitted to permit manual switching and Visual indication of state.

It is designed to meet the requirements of IEC/EN 60947-2 for low-voltage switching devices.