Westhomes HNB2L-63 1P+N RCCB | 230V Mini Circuit Breaker 63A

The HNB2L-63 is a single-phase, DIN-rail mounted residual current protection device rated up to 63 A at 230 V. It is designed to protect people against electric shock and to reduce fire risk from earth leakage in domestic and light-commercial distribution boards. Despite the "Mini Circuit Breaker" wording, as an RCCB its core job is earth-leakage protection rather than overload/short-circuit protection alone.

"1P+N" means the unit switches one phase (L) and one neutral (N) in a single narrow DIN-rail unit. Both conductors pass through the internal residual-current CT, and the device opens both poles simultaneously on a trip. This is the standard configuration for single-phase 230 V final circuits in homes, apartments and small offices.

The 63 A rated current is the maximum continuous current the device can carry without overheating, not the leakage trip threshold. It sets the upper limit for the load and cable size it can protect; a 63 A RCCB is typically used as a main or group RCD feeding multiple downstream MCBs whose total load does not exceed 63 A. Always size upstream cables and MCBs to match.

A toroidal core-balance current transformer continuously sums the currents in L and N. Under normal operation they are equal and opposite, producing zero net flux. If current leaks to earth through a person or faulty insulation, the imbalance energizes an electromagnetic release that opens the contacts. This happens independently of load current and very quickly, typically well under 0.1 s at rated sensitivity.

As an RCCB it does not — it trips only on residual (earth-leakage) current. You must pair it with a suitably rated MCB (or use an RCBO where combined protection is required) to cover overcurrent and short circuits. The 63 A rating is the current-carrying capacity of the RCCB itself, not an overload trip setting.

For personal protection against direct or indirect contact, a 30 mA sensitivity (IΔn) is the widely accepted international choice for socket outlets and final circuits. Higher sensitivities such as 10 mA are used in special locations (e.g. bathrooms, medical), while 100–300 mA versions are used upstream for fire protection and selectivity. Confirm the exact IΔn on the HNB2L-63 nameplate when ordering.

Type AC trips only on pure sinusoidal AC leakage currents. Type A adds detection of pulsating DC leakage, which comes from inverter air conditioners, washing machines, dishwashers, LED lighting, TVs and laptop chargers. For modern single-phase homes with electronic appliances, Type A is strongly preferred; Type AC is generally only acceptable for older, purely resistive installations.

Snap the unit onto a 35 mm DIN rail in the consumer unit. Connect the incoming phase and neutral to the line-side terminals (typically the top), and the outgoing circuit to the load-side terminals (bottom), observing the marked L and N positions. Route the neutral through the device — never bypass it — and keep downstream neutrals segregated; do not share a neutral between two RCCBs, as this causes nuisance tripping.

That pattern usually points to a leakage fault inside that appliance — damp heating element, degraded motor winding, or damaged cable insulation. Unplug or isolate the suspected load and confirm the RCCB stays stable with other circuits, then have the appliance inspected or replaced. If it trips even with everything disconnected, the fault lies in the fixed wiring or a neutral-to-earth cross-connection and needs an electrician.

RCCBs of this type are designed to IEC 61008 (residual current operated circuit-breakers without integral overcurrent protection). Products sold into the EU/EEA market should carry CE marking and relevant certification, and should comply with national wiring rules (e.g. IET BS 7671 in the UK, NF C 15-100 in France). Always verify the certificate and country of installation standard before procurement.