EXB3LE-63 RCBO,63A 30mA 100mA 300mA ,1P+N to 4P,Type AC B/C/D

Combined Overcurrent & Earth Leakage Protection Device Rated at 6A to 63A – the EXB3LE-63 RCBO

The HUYU Electric EXB3LE-63 eliminates the need for separate MCB & RCD devices when a distribution board requires both overcurrent and residual current protection from a single device via its RCBO. The full range of EXB3LE-63 includes: 6A – 63A rated current; 30mA – 300mA residual current sensitivity; and 5 pole configurations from: 1P+N through 4P. It conforms to IEC 61009-1 and GB/T 16917.1, carries CB and CE certifications, and uses Type AC residual current detection for standard sinusoidal AC leakage.

Seven different residual current ratings and seven different snap-on accessory options distinguish this high-performing RCBO breaker from simpler models. For instance, a 30mA device protects socket circuits against electric shock; while a 100mA or 300mA unit handles equipment-level earth leakage without nuisance tripping. For remote trip indication, users can add an OF or SD contact, while automatic disconnection on voltage anomalies can be ensured with an undervoltage (MN) or overvoltage (MV) release. Operating across a temperature range of -35°C to +70°C with an IP40 enclosure rating makes it suitable for unconditioned plant rooms and outdoor kiosks. Offering factory-direct OEM/ODM pricing with private labeling and complete documentation, HUYU Electric appeals to buyers who source RCBOs from manufacturers like Hager, Schneider, Fusebox, Eaton, ABB, MK, Chint, Legrand, or Crabtree.

RCBO Types and Configurations – 1P+N to 4P, 30mA to 300mA

All configurations share a 6kA Icn/Ics symmetrical breaking capacity and Type AC residual current detection. The seven IΔn options span 30mA for personnel protection through 300mA for equipment and fire protection. Type B, C, and D thermal-magnetic curves match resistive, inductive, and high-inrush loads respectively. This RCBO circuit breaker family covers the most common installations from residential consumer units to commercial three-phase boards — one product range, one supplier.

Technical Specifications

Buyer’s Guide

How to Choose Your RCBO – Current, Sensitivity & Curve

A practical guide to selecting the right EXB3LE-63 for your consumer unit or distribution board.

1. Choosing the Current Rating

The EXB3LE-63 spans 6A to 63A. Lighting circuits use 6A or 10A; socket outlets 16A or 20A; water heaters and air conditioners 25A or 32A; cookers, showers, and sub-mains 40A to 63A. Because this is an RCBO, each circuit gets its own combined overcurrent and earth leakage protection — a fault on one circuit does not trip the whole board.

2. Selecting the Residual Current (IΔn)

30mA is the standard for personnel shock protection on socket circuits. Use 100mA for circuits feeding fixed equipment where nuisance tripping from normal earth leakage is a concern. 300mA is typically used for fire protection or as a main incoming device. The EXB3LE-63 provides all three common sensitivities plus 50mA, 75mA, 150mA, and 200mA for fine-tuning — a breadth of choice not available on most competing RCBOs.

3. Type B, C, or D Curve?

Type B (3–5× In) for resistive loads. Type C (5–10× In) for inductive loads — motors, HVAC, fluorescent lighting. Type D (10–20× In) for high-inrush equipment. The tripping curve chart above shows the exact time-current relationship. Note: the EXB3LE-63 is Type AC for residual current — suitable for standard sinusoidal AC leakage. For circuits with electronic loads producing DC leakage components, a Type A RCBO would be required.

4. Pole Count & Installation Notes

1P+N for single-phase 230V circuits. 2P for double-pole isolation. 3P and 3P+N for three-phase 400V distribution. 4P for complete isolation with neutral. Mount on TH35-7.5 DIN rail, top-in bottom-out wiring, 25mm² terminal capacity at 2.0 N·m torque. IP20 direct, IP40 in enclosure. The wide -35°C to +70°C operating range covers unconditioned plant rooms and outdoor kiosks.

Frequently Asked Questions

What exactly is an RCBO?

An RCBO (Residual Current Breaker with Overcurrent Protection) is a single device that combines the functions of an MCB and an RCD. It protects against overcurrent and short-circuits, while also detecting earth leakage to provide protection. Using RCBOs simplifies wiring and reduces DIN rail space requirements. The EXB3LE-63 RCBO is an advanced device rated up to 63A, with selectable residual current sensitivity ranging from 30mA to 300mA.

How is an RCBO different from an MCB?

An MCB safeguards against overcurrent, tripping when the rated current is exceeded due to overload or short-circuits. RCBOs offer all the protection features of an MCB but go further by detecting and preventing earth leakage that may result in electric shocks. This makes RCBOs particularly suitable for securing socket circuits in residential electrical systems.

How is an RCBO different from an RCD?

An RCD solely handles earth leakage protection and requires an additional MCB or fuse to protect against overcurrent. RCBOs, on the other hand, integrate both functionalities into a single device, protecting against overcurrent, short circuits, and earth leakage. The EXB3LE-63 RCBO offers a comprehensive solution, combining these protections in one convenient DIN-rail-mounted unit.

What are the types of RCBOs available (A, AC, B)?

RCBOs are classified based on the type of residual currents they detect. Type AC RCBOs respond to standard sinusoidal AC leakage, making them ideal for residential applications. Type A RCBOs additionally detect pulsating DC leakage from rectifier circuits, while Type B RCBOs handle smooth DC currents, suitable for EV chargers and solar inverters. The EXB3LE-63, designed for standard residential and commercial circuits, is a Type AC RCBO.