HUM18LY-63 RCBO Circuit Breaker-1P+N,63A 30mA 50mA,Type AC/A

1P+N HUM18LY-63 RCBO Circuit Breaker – 10kA, Type AC/A, 230 Volts

RCBOs have different detection methods for residual current. HUYU’s HUM18LY-63 is an electronic RCBO, designed to detect earth faults quickly and accurately. This device provides a 10kA (Icu) / 7.5kA (Ics) overcurrent tripping capacity, with a current rating range of 6A to 63A and a voltage rating of AC 230V. It also features residual current tripping protection at either 30mA or 50mA. The product carries the CCC mark and complies with the IEC 61009-1 standard, making it suitable for installations in China and export markets requiring this certification.

This 1P+N HUM18LY-63 RCBO stands out with two key features. Firstly, it supports detection of both Type AC residual current (for standard residential circuits) and Type A (which also detects pulsating DC, essential for circuits supplying LED drivers, inverter air conditioners, and electronic appliances). Secondly, the N-pole can be configured in two ways: as a break point (HUM18LY-63) for full phase and neutral isolation, or as a direct-through (HUM18LY-63W) where neutral switching is not necessary.

N-Pole Options – Break Point vs Direct Through

The HUM18LY-63 RCBO disconnects both phase and neutral when tripped, which is commonly required for socket outlets and fixed appliances. Meanwhile, the HUM18LY-63W keeps the neutral solid, simplifying busbar layouts and reducing costs where neutral switching is handled upstream. Both variants share the same 10kA Icu / 7.5kA Ics, 6A–63A current range, Type AC/A residual current detection, and 30mA or 50mA sensitivity. Supported trip curves (B, C, D) enhance the flexibility of load matching from the same product family.

Electronic Detection – Consistent Sensitivity, Type A Capability

Electronic RCBOs like the HUM18LY-63 use a detection circuit powered directly by the supply voltage instead of relying solely on mechanical relays. This ensures steady trip sensitivity over time and across full voltage ranges. Moreover, this design enables Type A residual current detection, which identifies pulsating DC leakage caused by modern appliances such as LED lighting, inverter air conditioners, and variable-speed motors. With a 10kA Icu overcurrent capacity, 500V insulation voltage, and 4kV impulse withstand, the HUM18LY-63 is a reliable solution for both residential and industrial applications.

Technical Specifications

OEM/ODM Supply – Electronic RCBO with CCC Certification for China & Export Markets

Buyer’s Guide

How to Choose a 1P+N RCBO Circuit Breaker – Current, Sensitivity & N-Pole Type

A guide to specifying the HUM18LY-63, plus how HUYU’s RCBO range fits different project needs.

1. Choosing the Current Rating

Lighting circuits: 6A or 10A. Socket outlets: 16A or 20A. Water heaters and air conditioners: 25A or 32A. Cookers, showers, and sub-mains: 40A to 63A. The 25mm² terminal capacity with 2.0 N·m torque handles the largest conductors at 63A. Always verify cable sizing independently — the RCBO circuit breaker protects the cable; the cable must be rated for the load.

2. 30mA or 50mA Residual Current?

30mA is the standard for personal shock protection and is mandatory on socket circuits under most wiring regulations. 50mA offers a slightly higher threshold — useful on fixed equipment circuits where cumulative earth leakage from multiple devices might trigger 30mA nuisance tripping, while still providing earth fault protection. Both sensitivities are available from the same HUM18LY-63 product family.

3. N-Pole Break Point or Direct Through?

Choose the HUM18LY-63 (break point) when the installation requires full isolation of both phase and neutral — the default for most residential and commercial circuits. Choose the HUM18LY-63W (direct through) when neutral isolation is already provided upstream or local codes permit a solid neutral. The direct-through variant typically simplifies busbar arrangements and reduces cost.

4. Which HUYU RCBO Fits Your Project?

HUYU Electric offers four RCBO series for different requirements. The EXB3LY-63 (6kA, 1P+N, 30/50mA) is the entry-level single-phase option. The EXB3LE-63 (6kA, 1P+N–4P, 30–300mA) suits multi-pole applications with seven sensitivity choices. The HUM18LE-63 (10kA, 1P+N–4P, 30–300mA, Type AC/A, CCC/RoHS) covers the full range with higher breaking capacity and multi-certification. The HUM18LY-63 (10kA, 1P+N only, 30/50mA, Type AC/A, CCC) is the electronic-detection specialist with N-pole flexibility — specifically designed for single-phase 230V circuits in projects requiring CCC certification and Type A residual current detection.

Frequently Asked Questions

What is the RCBO breaker?

An RCBO breaker — Residual Current Breaker with Overcurrent — is a single device that combines an MCB (overcurrent protection) and an RCD (earth leakage protection). It protects a circuit against overload, short circuit, and residual current in one DIN-rail-mounted unit. The HUM18LY-63 is an electronic RCBO circuit breaker with 10kA breaking capacity, Type AC/A detection, and 30mA or 50mA sensitivity.

What are the disadvantages of RCBO?

RCBOs cost more per circuit than a shared RCD‑plus‑MCB arrangement, and they occupy more DIN rail space per way in a consumer unit compared to a single RCD protecting multiple MCBs. Electronic RCBOs like the HUM18LY‑63 rely on the supply voltage for the residual current sensing circuit; if the supply fails, the earth leakage detection also stops — though the overcurrent protection remains operational. For circuits where this is a concern, a voltage‑independent (mechanical) RCBO or a backup protection strategy should be considered.

What is the difference between an RCBO and a circuit breaker?

A standard circuit breaker (MCB) protects only against overcurrent — overload and short circuit. An RCBO circuit breaker adds earth leakage protection on top of overcurrent protection. If a person touches a live conductor and current leaks to earth, the RCBO detects the imbalance and trips within milliseconds. An MCB would not respond to this type of fault. The HUM18LY‑63 is an RCBO; a device from the HUYU HUM18 or EXB3 series would be an MCB.

Which is better RCBO or RCCB?

An RCBO is generally the better choice for individual circuit protection because it provides both overcurrent and earth leakage protection in one device. An RCCB provides earth leakage protection only — it must be paired with a separate MCB or fuse for overcurrent protection. Using RCBOs on each circuit means a fault on one circuit does not interrupt power to others; a single RCCB protecting multiple MCBs would disconnect all those circuits on a leakage fault. The HUM18LY‑63 is an RCBO; for applications where only residual current detection is needed and overcurrent protection is provided elsewhere, an RCCB may be sufficient.