Hager MCB 10A Triple Pole B Curve NBN310A

Hager NBN310A: 10A 3 Pole B Curve Miniature Circuit Breaker (MCB) with 10kA/15kA breaking capacity for three-phase distribution boards.

Safety & Reliability

This Hager miniature circuit breaker protects three-phase circuits against short circuits and overload current, tripping automatically to isolate the fault before damage occurs. The trip-free mechanism means the breaker cannot be held closed against a fault, so protection stays reliable even under fault conditions.

A clear green "OFF" indicator on the toggle shows isolation status at a glance, helping engineers confirm safe isolation before working on a circuit. Rated to 10kA per BS EN 60898-2 and 15kA per BS EN 60947-2, this mcb electrical device handles demanding fault levels found in commercial and industrial installations.

Installation & Compliance

At just 3 modules wide, this triple pole mini circuit breaker keeps consumer unit and distribution board layouts compact, freeing up space for additional circuits. Connection terminals accept up to 25mm² flexible or 35mm² rigid conductors, giving installers flexibility on cable sizing without adapters.

Built to BS EN 60898-2 and BS EN 60947-2, this Hager NBN310A unit gives contractors a wylex miniature circuit breaker alternative with documented, verifiable compliance for sign-off and building control records. An IP20 enclosure rating and 500V insulation voltage suit standard enclosed distribution board applications.

Control & Isolation

Beyond overload and short-circuit protection, this hager miniature circuit breaker also functions as a manual isolator and control switch for the protected circuit, letting engineers isolate load-side equipment for maintenance without removing the breaker. Rated for AC voltage at 400V and 50Hz, it suits standard UK three-phase supplies.

Key Features of the Hager Miniature Circuit Breaker NBN310A Include:

• Protects Against Short Circuits And Overload Current
• Trip-Free Mechanism Prevents Closing Against A Fault
• Green "OFF" Toggle Indicator Shows Isolation Status At A Glance
• Doubles As A Manual Isolator And Control Switch
• Compact 3 Module Width Saves Distribution Board Space
• Accepts 25mm² Flexible Or 35mm² Rigid Conductors
• B Curve Tripping Characteristic For General Circuit Protection
• Rated Current: 10A
• Rated Voltage: 400V AC, 50Hz
• Breaking Capacity: 10kA (BS EN 60898-2) / 15kA (BS EN 60947-2)
• Degree Of Protection: IP20
• Conforms To BS EN 60898-2 (10kA) And BS EN 60947-2 (15kA)
• Supplied As Single Unit

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