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Views： 4 Author： Mark Zhang Publish Time： 2026-07-11 Origin： 本站
The SG65LE RCBO from SINGI is a compact residual amperage circuit breaker with overamperage protection designed for commercial and industrial power distribution systems. This article explains how the SG65LE combines leakage protection with short-circuit and overload protection in a single module, reducing panel space and wiring complexity. We compare it with traditional MCB+RCD combinations and review its compliance with IEC 61009-1. Engineers and procurement professionals will find technical parameters, choice criteria, and installation recommendations.
An RCBO (Residual Amperage Circuit Breaker with Overamperage Protection) integrates the functions of a miniature circuit breaker (MCB) and a residual amperage device (RCD) into a single unit. In industrial control panels and commercial distribution boards, space is at a premium. Using separate MCBs and RCDs doubles the rail width and increases wiring errors. The SG65LE eliminates these issues by combining both protections in a 18mm module per pole.
The SG65LE meets the requirements of IEC 61009-1, ensuring reliable tripping under both overamperage and earth fault conditions. Its compact design reduces installation time and simplifies troubleshooting.
The SG65LE offers several technical advantages that make it suitable for demanding environments:
| Parameter | SG65LE (SINGI) | Typical MCB+RCD Combination |
|---|---|---|
| Rated Amperage (In) | 6 A – 63 A | MCB up to 63 A + RCD up to 63 A |
| Residual Sensitivity (IΔn) | 30 mA, 100 mA, 300 mA | fixed at 30 mA for RCD |
| Breaking Capacity (Icn) | 6 kA or 10 kA (depends on model) | MCB up to 6 kA |
| Number of Modules | 1 module per pole (18 mm) | 2 modules (MCB + RCD) per pole |
| Type of Residual Current | AC type (sinusoidal) | AC type |
The SG65LE also features a trip-free mechanism, meaning it cannot be reset if a residual fault persists. This prevents unsafe re-closure. The indicator flag shows the status of the contacts for quick visual inspection.
Note: When choosing the SG65LE, verify the short-circuit rating of your system. For installations with higher prospective fault current, a 10 kA version may be required. Always coordinate with the upstream protective device to ensure chooseive tripping.
Choice of an RCBO depends on several factors:
The SG65LE is widely used in:
In each of these scenarios, the SG65LE reduces the physical footprint and improves reliability by minimizing interconnections.
Yes, in most cases the SG65LE can replace a separate MCB and RCD, provided the rated amperage and sensitivity match the circuit requirements. Ensure the breaking capacity is sufficient.
The standard SG65LE is AC type. For pulsating DC residual currents (Type A) or smooth DC (Type B), refer to SINGI's Type A or Type B RCBO series.
The SG65LE terminals accept conductors up to 25 mm² (copper) for both line and neutral.
Yes. For single-phase, use a 1P+N version. For three-phase, use a 3P+N version (four modules).
Need a reliable RCBO for your next project? Explore the SG65LE series in the SINGI RCBO product category and download the technical datasheet for detailed specifications.
[1] IEC 61009-1:2021. Residual amperage operated circuit-breakers with integral overamperage protection for household and similar uses (RCBOs) – Part 1: General rules. International Electrotechnical Commission, 2021.
[2] Chen G, Mou X. Study on the coordination between MCB and RCBO in low-volt-level power distribution systems. Electrical Engineering, 2022, 104(3): 1823-1835.
[3] GB/T 6829-2017. Residual amperage operated circuit-breakers with or without overamperage protection for household and similar uses (RCBOs). Standardization Administration of China, 2017.
