Circuit breaker noark NO025 1P C 25A 6kA AC Ex9BN 100100

Noark single-pole miniature circuit breaker NO025 (model Ex9BN 100100) is a DIN-rail mountable protective device for single-phase electrical circuits. With a C tripping characteristic and a rated current of 25 A, this breaker is designed to protect wiring and connected equipment from overloads and short circuits in standard 230/240 V AC installations. The device provides a breaking capacity of 6 kA (AC), making it suitable for residential, commercial and light-industrial distribution panels where dependable short-circuit interruption is required.

Advantages

The breaker combines a compact form factor with a defined C characteristic for reliable tripping on moderate inrush currents and short-circuit events. DIN-rail compatibility enables straightforward installation in distribution boards and enclosures. A rated breaking capacity of 6 kA ensures the device can interrupt typical fault currents in small to medium installations. The single-pole configuration conserves panel space while providing dedicated protection for single-phase circuits.

Suitable for

• Protection of lighting and socket circuits in residential buildings
• Branch circuit protection in commercial fit-outs and offices
• Local protection for motors or appliances with moderate inrush currents
• Distribution panels in light-industrial or workshop environments

Key specifications

• Poles: 1 (single-pole)
• Tripping characteristic: C (for moderate inrush currents)
• Rated current: 25 A
• Breaking capacity: 6 kA (AC)
• Nominal voltage: for use in 230/240 V AC single-phase systems
• Mounting: DIN-rail compatible
• Application: overload and short-circuit protection

How to use

Install the miniature circuit breaker on a standard DIN-rail inside a distribution board following local electrical codes and safety practices. Ensure power is isolated before making connections. Connect the phase conductor to the breaker input and the load conductor to the output terminal, tightening terminals to the manufacturer's recommended torque. After wiring, switch the breaker on and verify correct operation by applying a controlled load; test routine operation and trip function according to applicable regulations.

Usage recommendations

Use the breaker within its rated current and voltage limits and verify coordination with upstream and downstream protective devices to ensure selective tripping where required. For circuits with high inrush currents, confirm the C characteristic is appropriate; where higher instantaneous tolerance or different coordination is needed, consider an alternative characteristic. Perform periodic visual inspections and testing as part of routine maintenance to confirm terminals are secure and the device operates correctly after fault conditions.