Hager MCB 20A Triple Pole Type D Curve NDN320A

Hager NDN320A: 20A 10kA Type D 3 Pole Miniature Circuit Breaker (MCB) with trip-free mechanism and 3 module width for compact consumer unit installation.

Safety & Reliability

This mini circuit breaker uses a trip-free mechanism, so the contacts open on a fault even if the toggle is held or jammed in the ON position. That means the circuit disconnects reliably regardless of user interference, protecting both the installation and anyone working on it.

Isolation status is easy to confirm at a glance: the toggle shows a clear green "OFF" marking when the device is switched off, removing any guesswork during maintenance or fault-finding on site.

Overload & Short-Circuit Protection

Rated at 20A with a D curve tripping characteristic, this Hager MCB is suited to circuits with high inrush currents, such as motors and transformers, where a B or C curve device would nuisance-trip. It's rated 10kA to BS EN 60898-2 and 15kA to BS EN 60947-2, giving a wide safety margin against fault currents on both domestic and light commercial supplies.

Installation & Compliance

At just 3 modules wide, this 3 pole MCB electrical device saves valuable space in a busy distribution board compared to bulkier alternatives. It accepts 25mm² flexible or 35mm² rigid conductors, giving installers flexibility when terminating larger cables, and carries an IP20 ingress protection rating for safe handling once fitted behind a consumer unit enclosure.

Full compliance with BS EN 60898-2 and BS EN 60947-2 means this Hager miniature circuit breaker is ready to specify on both domestic and industrial projects without additional certification checks.

Key Features of the Hager NDN320A Miniature Circuit Breaker (MCB) Include:

• Trip-Free Mechanism For Reliable Overload & Short-Circuit Disconnection
• Clear Green "OFF" Toggle Indication For Fast Visual Isolation Checks
• D Curve Characteristic Suited To High Inrush Loads Such As Motors & Transformers
• Compact 3 Module Width Saves Space In The Distribution Board
• Accepts 25mm² Flexible & 35mm² Rigid Conductors For Flexible Termination
• Rated Current: 20A
• Rated Voltage: 400V AC, 50Hz
• Short-Circuit Breaking Capacity: 10kA (BS EN 60898-2), 15kA (BS EN 60947-2)
• Rated Insulation Voltage: 500V, Impulse Withstand: 6kV
• Ingress Protection: IP20
• Operating Temperature: -25°C Minimum
• Compliant With BS EN 60898-2 & BS EN 60947-2

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