Hager MCB 20A Single Pole Type D Curve NDN120A

Hager NDN120A: 20A D Curve 1 Pole Miniature Circuit Breaker (MCB) with dual 10kA/15kA breaking capacity for demanding circuit protection.

Reliable Circuit Protection

This mini circuit breaker protects against both short circuits and sustained overload current, tripping the circuit before damage or fire risk occurs. The D curve tripping characteristic makes it suited to circuits with high inrush currents, such as motors and transformers, where standard curves would nuisance-trip.

Safety & Reliability

A trip-free mechanism means the breaker cannot be held closed against a fault, so the circuit is disconnected regardless of how the toggle is operated. Isolation status is shown clearly by the green "OFF" position on the toggle, giving installers and end users an unambiguous visual check before working on the circuit.

Installation & Compliance

Rated for 400V AC at 50Hz with a single module width, this Hager miniature circuit breaker fits standard consumer units and distribution boards without extra space. Terminals accept up to 25mm² flexible or 35mm² rigid conductors, giving installers flexibility when wiring larger loads. It's tested and certified to BS EN 60898-2 (10kA) and BS EN 60947-2 (15kA), so it meets the wiring regulations electricians need to sign off installations with confidence.

Control & Access

As a single pole device, this MCB electrical protection device isolates the live conductor on the protected circuit, giving straightforward manual control for maintenance and testing. It's a direct fit wherever a Wylex miniature circuit breaker or Hager miniature circuit breaker of equivalent rating is being replaced or specified, keeping installation consistent across boards.

Key Features of the Hager NDN120A Miniature Circuit Breaker Include:

• Protects Against Short Circuit & Overload Current
• Trip-Free Mechanism For Guaranteed Disconnection Under Fault Conditions
• Clear Green "OFF" Toggle Indication For Safe Isolation
• D Curve Tripping Characteristic Suited To High Inrush Loads
• Accepts 25mm² Flexible & 35mm² Rigid Conductors
• Rated Current: 20A
• Rated Voltage: 400V AC, 50Hz
• Number Of Poles: 1
• Rated Short-Circuit Breaking Capacity Icn (BS EN 60898): 10kA
• Rated Short-Circuit Breaking Capacity Icu (BS EN 60947-2): 15kA
• Rated Insulation Voltage Ui: 500V
• Rated Impulse-Withstand Voltage Uimp: 6kV
• Ingress Protection Rating: IP20
• Operating Ambient Temperature: -25°C Minimum
• Width: 1 Modular Spacing
• Recess Depth: 70mm
• Compliance: BS EN 60898-2 & BS EN 60947-2
• What's In The Box: 1 x Hager NDN120A MCB

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.