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Views： 4 Author： Mark Zhang Publish Time： 2026-08-18 Origin： 本站
The DZ30LE-32 RCBO from SINGI combines residual amperage protection and overamperage protection in a single 1P+N module. Designed for residential and light commercial distribution boards, this SINGI RCBO delivers reliable earth-leakage detection and short-circuit protection in one compact package. Engineers and contractors can reduce panel space, simplify wiring, and meet modern electrical safety requirements with a single device.
| Protection Function | DZ30LE-32 RCBO | Separate MCB + RCD |
|---|---|---|
| Overload protection | Yes | Yes (MCB) |
| Short-circuit protection | Yes | Yes (MCB) |
| Earth leakage protection | Yes | Yes (RCD) |
| Panel space required | 1 module | 2 modules |
| Wiring complexity | Low | Higher |
| Coordination between functions | Factory-tested | Manual choice |
A standard miniature circuit breaker (MCB) protects against overloads and short circuits but does not detect earth leakage currents. The DZ30LE-32 residual amperage circuit breaker with overamperage protection integrates both functions. It monitors the vector sum of live and neutral currents. When leakage amperage exceeds the rated residual operating current, the device trips and disconnects the circuit. This dual protection eliminates the need for a separate RCD in many final circuits, saving valuable DIN-rail space in consumer units and distribution boards.
The DZ30LE-32 is rated at 32 A and offers a 30 mA residual sensitivity, suitable for personal protection against indirect contact and direct contact in ordinary installations. The device is designed to comply with GB/T 6829-2017, the Chinese national standard for residual amperage operated circuit-breakers with or without overamperage protection, ensuring its performance and reliability.
Note: Always verify local wiring regulations and choose the appropriate rated residual operating amperage (IΔn) for the installation environment. 30 mA is recommended for general-purpose socket outlets and lighting circuits.
In modern electrical installations, protection against electric shock and fire caused by earth faults is as important as overamperage protection. A residual amperage circuit breaker with overamperage protection addresses both risks in one device. This is valuable in residential and small commercial projects where panel space is limited and installation cost must be controlled.
Using separate MCBs and RCDs requires careful coordination to ensure that the RCD does not trip due to the MCB's magnetic characteristic or that the MCB does not operate during a residual fault. The SINGI DZ30LE-32 RCBO eliminates this coordination issue because the manufacturer tests both functions together. The result is a faster, more reliable response to faults.
According to IEC 60898-1, circuit-breakers for overamperage protection in household installations must meet specific breaking capacity and operating characteristics. The DZ30LE-32 is designed to meet the requirements for both overamperage and residual amperage protection, making it a versatile solution for distribution boards that need to comply with modern electrical standards.
The DZ30LE-32 uses a differential amperage transformer to continuously compare the amperage flowing through the live conductor with the amperage returning through the neutral conductor. Under normal conditions, these currents are equal and opposite. When a leakage amperage flows to earth, an imbalance occurs. The transformer detects this imbalance, and the electronic trip unit activates the mechanism to open the contacts.
This residual amperage circuit breaker is designed with a short response time, within 0.1 seconds for a sudden leakage current, providing a high level of protection. The device also features a test button that simulates a leakage condition and verifies that the trip mechanism is functional. This routine test is recommended at regular intervals to ensure continued protection.
The DZ30LE-32 is manufactured using flame-retardant thermosetting materials that meet high dielectric strength requirements. The amperage path and arc-extinguishing system are optimized to handle short-circuit currents up to the device's rated breaking capacity, ensuring safe interruption even under fault conditions.
The DZ30LE-32 is suitable for a wide range of installations, including:
Because the device combines overamperage and residual amperage protection in one module, it is useful for retrofitting older installations where space is limited. It also simplifies panel design by reducing the number of components and wiring connections, lowering the risk of installation errors.
For engineers and procurement professionals, choosing a SINGI DZ30LE-32 RCBO ensures that the protective device meets the required national and international standards. The device is listed in the SINGI product catalogue, and detailed specifications can be accessed on the official product page.
An RCD only provides residual amperage (earth leakage) protection. An RCBO combines residual amperage protection with overamperage protection (overload and short circuit). The DZ30LE-32 is an RCBO, so it replaces both an MCB and an RCD in most final circuits.
30 mA is the rated residual operating current. The device will trip when the leakage amperage reaches 30 mA, which is the standard threshold for personal protection against electric shock. This sensitivity is suitable for general-purpose socket outlets and lighting circuits in residential and commercial buildings.
Yes, in most cases it can. The DZ30LE-32 provides both functions in a single module, saving space and simplifying wiring. However, always verify that the rated current, breaking capacity, and residual sensitivity match the circuit requirements and local regulations.
It is recommended to press the test button at least once every three months to verify that the residual amperage trip mechanism is working correctly. If the device does not trip when the test button is pressed, consult a qualified electrician.
For detailed technical data, wiring diagrams, and certification documents, visit the official DZ30LE-32 RCBO product page on the SINGI website. Contact the SINGI sales team for volume pricing and OEM inquiries.
[1] GB/T 6829-2017. Residual amperage operated circuit-breakers with or without overamperage protection for household and similar uses (RCBOs) [S]. 2017.
[2] IEC 60898-1. Electrical accessories - Circuit-breakers for overamperage protection for household and similar installations - Part 1: Circuit-breakers for a.c. Operation [S]. 2019.
[3] GB/T 10963.1-2020. Electrical accessories - Circuit breakers for overamperage protection for household and similar installations - Part 1: Circuit-breakers for a.c. Operation [S]. 2020.
