Hager MCB 50A Triple Pole Type D Curve NDN350A

Hager NDN350A: 50A 3 Pole D Curve Miniature Circuit Breaker (MCB) with 10kA breaking capacity and a compact 3 module width.

Safety & Reliability

This mini circuit breaker protects circuits against overload and short-circuit faults, cutting power automatically before cables or connected equipment are damaged. The D curve tripping characteristic is designed for loads with high inrush current, such as motors, transformers and compressors, so the breaker rides through normal start-up surges without nuisance tripping while still reacting fast to a genuine fault. A trip-free mechanism means the toggle cannot be held closed against a fault condition, so the protection can never be manually defeated.

Clear Isolation & Control

The toggle shows a clear green "OFF" indication when the circuit is isolated, giving installers and maintenance staff an unmistakable visual check before opening an enclosure or working downstream. This also lets you isolate an individual three-phase circuit for planned maintenance without shutting down the whole board.

Installation & Compliance

Terminals accept up to 25mm² flexible or 35mm² rigid conductors, giving enough capacity for heavier three-phase loads on commercial and light industrial installations. Built and tested to BS EN 60898-2 (10kA) and BS EN 60947-2 (15kA/30kA), this Hager miniature circuit breaker meets the standards specified for distribution boards, and its slim 3-module width keeps three-phase panels compact where board space is at a premium.

Key Features of the Hager NDN350A Miniature Circuit Breaker (MCB) Include:

• Reliable Overload & Short-Circuit Protection For 3-Phase Circuits
• D Curve Characteristic Suited To Motors, Transformers & High Inrush Loads
• Trip-Free Mechanism Prevents The Breaker Being Held Closed Against A Fault
• Green "OFF" Toggle Indication For Clear, Safe Isolation
• Accepts Up To 25mm² Flexible Or 35mm² Rigid Conductors
• Rated Current: 50A
• Rated Voltage: 400V AC
• Poles: 3 Pole (Triple Pole MCB)
• Tripping Characteristic: Type D Curve
• Breaking Capacity: 10kA (BS EN 60898-2) / 15kA (BS EN 60947-2)
• Width: 3 Modular Spacings
• Ingress Protection: IP20
• Minimum Ambient Operating Temperature: -25°C
• Compliance: BS EN 60898-2, BS EN 60947-2
• Supplied As: Single Hager Electrical MCB, Order Unit Qty 1

If you need some help, would like to take advantage of our Price Promise or have a large order to place, give our team of professionals a call on 0203 994 5470, drop us an email at sales@electricpoint.com or use our Contact Form.