HNB9L-63 1P+N RCCB | 230V 63A Electronic RCBO Breaker

The HNB9L-63 1P+N is a single-module (or compact 2-module) residual current operated circuit breaker with overcurrent protection (RCBO) designed for 230V single-phase household and light-commercial circuits. It combines earth-leakage protection, overload protection and short-circuit protection in one device, replacing the traditional MCB + RCD combination in consumer units. It is typically rated up to 63A with a 30mA residual current sensitivity.

An electronic RCBO uses an electronic amplifier (powered by the line voltage) to boost the residual current signal before triggering the trip mechanism, allowing a smaller toroidal core and more compact housing. The trade-off is that it requires a minimum operating voltage to function — if the live or neutral supply is lost, the device may not trip on a residual current fault. Electromagnetic types are fully self-powered and immune to supply loss.

The HNB9L-63 1P+N is rated for AC 230V, 50/60Hz, with a nominal current up to 63A. It offers a residual current sensitivity of typically 30mA (Type AC or Type A), a breaking capacity usually of 6kA (10kA on select versions), and operates on a DIN rail in a 1P+N (2-pole) configuration that switches both line and neutral simultaneously. The tripping curve is typically B or C for standard residential and mixed loads.

"1P+N" means the device has one pole that actively switches and provides overcurrent/short-circuit protection on the line (L) conductor, plus an additional pole that switches the neutral (N) conductor but does not include an overcurrent trip. Both contacts open together during tripping or manual operation, providing complete isolation of the branch circuit. This is the standard configuration for single-phase domestic branch circuits in European and Asian consumer units.

Yes — that is the core advantage of an RCBO. The HNB9L-63 integrates a current-sensing transformer (for residual current detection), an electronic trip unit (for residual current), and a thermal-magnetic trip (for overload and short-circuit) inside one housing. This saves DIN rail space, simplifies wiring, and ensures that earth-fault and overcurrent protection share the same tripping mechanism. Use it where individual branch-circuit RCD protection is required.

Connect the supply L and N to the marked IN terminals (usually top), and the load L and N to the OUT terminals (bottom). Never swap line and neutral or reverse supply/load, as the electronics and test circuit expect a specific polarity. Ensure the neutral conductor is connected only through the RCBO and not bonded to earth downstream. Torque the terminals per the nameplate (commonly 1.2–2.0 N·m for 6mm², up to 3.5 N·m for 25–35mm²) and route neutral wires neatly to avoid inducing leakage.

Electronic RCBOs can be more sensitive to nuisance tripping from high-frequency leakage (e.g., from LED drivers, dimmer switches, variable-speed motors, solar inverters, and EV chargers), surge events, or voltage dips that temporarily disable the electronics. If tripping occurs under normal load, first identify whether it is an earth-fault trip (residual) or overcurrent trip (look at the indicator window or trip cause label on the device), then isolate loads to find the source. Switching to a Type A or Type F RCBO or a time-delayed (S-type) model often resolves high-frequency nuisance trips.

The HNB9L-63 RCBO is designed and tested to IEC 61009-1 (Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses — RCBOs). It also references IEC 60898-1 for the overcurrent/short-circuit characteristics. Depending on the destination market, additional national certifications (CE, CB, UKCA, etc.) may be marked on the rating label.

This single-phase RCBO is ideal for final circuits in residential consumer units — protecting socket outlets, lighting circuits, kitchen circuits, bathroom circuits, and outdoor circuits. It is also widely used in apartments, villas, hotels, offices, retail shops and light-commercial distribution boards where individual branch-circuit earth-leakage protection is required without tripping the whole installation on a single fault.

Press the T (test) button at least every six months — the device should trip immediately and reset after a short pause. Annual maintenance includes checking that terminals are tight, verifying no discoloration or burning around the housing, and confirming the supply voltage is within the rated range (too-low voltage can prevent the electronics from operating). If the test button fails to trip, or if the unit feels warm under normal load, replace it immediately. Electronic RCBOs have a typical design life of 10–20 years depending on environmental conditions.