Circuit breaker noark Ex9BN 3P B 25A 6kA AC (MPN NO015)

The noark Ex9BN three-pole miniature circuit breaker, type B with a rated current of 25 A and a breaking capacity of 6 kA AC, is intended to provide reliable overcurrent protection in residential, commercial and light industrial electrical installations. The device is DIN-rail mountable and designed to protect wiring, electrical loads and connected equipment from overloads and short circuits while fitting standard distribution boards and control panels.

Advantages

The Ex9BN 3P B 25A 6kA AC offers stable trip characteristics for protection of circuits with moderate inrush currents, ensuring sensitive disconnection of fault currents while avoiding unnecessary trips from temporary surges. Compact three-pole design reduces panel space requirements and simplifies wiring for three-phase circuits. Mechanical construction conforms to standard installation practices and supports easy DIN-rail mounting and replacement.

Suitable for

• Protection of three-phase branch circuits in residential and commercial distribution boards
• Feeding small motor loads, lighting circuits and general-purpose outlets with type B characteristic
• Use in control panels and sub-distribution for light industrial equipment

Key specifications

• Poles: 3 (three-pole)
• Tripping characteristic: type B (earth leakage and short-circuit sensitivity appropriate for resistive and light inductive loads)
• Rated current: 25 A
• Breaking capacity: 6 kA AC
• Mounting: DIN-rail compatible
• Application environment: residential, commercial and light industrial installations

How to use

Install the circuit breaker on a standard DIN rail inside a distribution board or control panel according to local electrical codes and national wiring regulations. Ensure incoming and outgoing conductors are sized appropriately for the 25 A rating and torqued to the manufacturer’s recommended values. Use the breaker as a protective device for three-phase circuits, connecting each phase to one pole and verifying correct orientation and secure terminal connections before energizing the circuit. Test the installation by switching the breaker on and off and, where applicable, perform insulation and continuity checks prior to commissioning.

Usage recommendations

Choose type B characteristic for circuits with mainly resistive or light inductive loads and moderate inrush currents; for heavy motor loads or high inrush devices consider selecting a breaker with a different tripping curve. Regularly inspect connections and perform periodic functional checks in accordance with applicable standards to maintain reliable protection.