Hager MCB 40A Single Pole Type D Curve NDN140A

Hager NDN140A: 40A Single Pole D Curve Miniature Circuit Breaker (MCB) with 10kA/15kA short-circuit breaking capacity for demanding overload and fault protection.

Safety & Reliability

This Hager miniature circuit breaker combines overload and short-circuit protection with a trip-free mechanism, so the contacts cannot be held closed against a fault. The toggle shows a clear green "OFF" position when isolated, giving installers and maintenance staff an unambiguous visual check that the circuit is dead before work begins.

Precision Overload & Short-Circuit Protection

The D curve tripping characteristic is suited to circuits with high inrush currents, such as motors and transformers, reducing nuisance tripping on start-up while still protecting against genuine faults. Rated short-circuit breaking capacity of 10kA to BS EN 60898 (and 15kA to BS EN 60947-2) gives this mcb electrical device the robustness needed for industrial and commercial installations, not just domestic consumer units.

Installation & Compliance

A single modular width of 18mm keeps panel space efficient, and terminals accept 25mm² flexible or 35mm² rigid conductors for straightforward wiring on site. Wylex miniature circuit breaker equivalents share this footprint, so this Hager unit drops into standard DIN rail enclosures without modification. Compliance with BS EN 60898-2 and BS EN 60947-2 confirms this mini circuit breaker is fully certified for use across the UK and Europe.

Key Features of the Hager NDN140A Miniature Circuit Breaker (MCB) Include:

• Trip-Free Mechanism Prevents Contacts Being Held Closed Against A Fault
• Clear Green "OFF" Toggle Indication For Safe Isolation
• D Curve Characteristic Suited To High Inrush Loads Such As Motors
• Reduces Nuisance Tripping While Maintaining Fault Protection
• Rated Current: 40A
• Rated Voltage: 400V AC, 50Hz
• Poles: 1 Pole (Single Pole)
• Module Width: 1 Module (18mm)
• Breaking Capacity Icn: 10kA (BS EN 60898) At 230V
• Breaking Capacity Icu: 15kA (BS EN 60947-2) At 230V
• Rated Insulation Voltage (Ui): 500V
• Rated Impulse Withstand Voltage (Uimp): 6kV
• Over Voltage Category: III
• Pollution Degree: 2
• Degree Of Protection: IP20
• Connectable Conductor: 1mm² Solid Core & 1mm² Multi-Wired (Terminal Minimum); Accepts Up To 25mm² Flexible / 35mm² Rigid
• Ambient Operating Temperature: -25°C Minimum
• Compliance: BS EN 60898-2 (10kA) & BS EN 60947-2 (15kA)

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