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NB3LEU-A-C40 Chint RCBO 40A C Curve 30mA 10kA 1 Pole + Neutral
Chint NB3LEU-C40 RCBO, a 40 A C curve 30 mA 1P+N residual current operated circuit breaker with over-current protection and 10 kA short-circuit breaking capacity for consumer units and distribution boards.
£20.31
Why Choose the Chint NB3LEU-C40 RCBO?
The Chint NB3LEU-C40 is a compact and reliable residual current operated circuit breaker with over-current protection (RCBO) designed for residential, commercial and light industrial electrical installations. As part of the Chint NB3LEU series, it combines earth leakage protection, overload protection and short-circuit protection in one modular device.
This RCBO features a 1P+N configuration, making it suitable for single-phase circuits requiring both live and neutral switching. Its C curve tripping characteristic is suitable for circuits with moderate inrush currents, while the 30 mA residual current sensitivity provides additional protection against electric shock.
With a rated current of 40 A, a rated voltage of 240 V AC and a short-circuit breaking capacity of 10 kA, the NB3LEU-C40 is well suited to higher rated final circuits, radial circuits, small motors and selected distribution applications. Its DIN rail mounting design supports quick and secure installation in consumer units and distribution boards.
Key Advantages
- Compact RCBO combining RCD and MCB protection.
- 40 A rated current for higher rated final circuits.
- 30 mA residual current sensitivity for additional personal protection.
- C curve characteristic suitable for circuits with moderate inrush current.
- 10 kA short-circuit breaking capacity for dependable fault protection.
- DIN rail mounting for fast installation in consumer units and distribution boards.
Key Features
- Chint NB3LEU series electronic RCBO.
- 40 A rated current.
- 30 mA residual operating current.
- 1P+N configuration.
- C curve over-current protection.
- 10 kA rated short-circuit capacity.
- Provides overload, short-circuit and earth leakage protection.
- DIN rail mounting for modular electrical assemblies.
Combined Circuit and Earth Leakage Protection
RCBOs such as the Chint NB3LEU-C40 combine the functions of an MCB and an RCD in a single device. This allows the circuit to be disconnected in the event of overload, short circuit or earth leakage, helping improve electrical safety and circuit reliability.
The NB3LEU-C40 is suitable for applications where individual circuit protection is required. By protecting each final circuit independently, RCBOs can help minimise disruption compared with shared RCD arrangements, as a fault on one circuit is less likely to disconnect unrelated circuits.
Typical Applications
- Consumer units and distribution boards.
- Higher rated radial circuits.
- Residential electrical installations.
- Commercial building circuits.
- Small motors and inductive loads.
- Electrical panels requiring combined over-current and residual current protection.
Technical Specifications
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| Current | 40 A | |
|---|---|---|
| Phase | Single Phase | |
| Poles | 1-pole + N | |
| Device Type | RCBO | |
| Trip Curve | C curve | |
| Breaking Capacity | 10 kA | |
| Residual Current | 30 mA | |
| RCD Type | Type AC | |
| Manufacturer | Chint | |
| Series | NB3LEU | |
| Model | NB3LEU-C40 | |
| Product type | Residual current operated circuit breaker with over-current protection / RCBO | |
| Number of poles | 1P+N | |
| Rated current | 40 A | |
| Residual operating current | 30 mA | |
| Residual current type | Type AC | |
| Tripping curve | C curve | |
| Rated voltage | 230 / 240 V AC | |
| Rated frequency | 50 / 60 Hz | |
| Rated short-circuit capacity | 10 kA | |
| Rated insulation voltage | 500 V | |
| Rated impulse withstand voltage | 4 kV | |
| Mounting type | 35 mm DIN rail | |
| Protection rating | IP20 | |
| Operating temperature | approx. -5 to +40°C | |
| Standards | IEC / EN 61009-1 |
Frequently Asked Questions
What is the Chint NB3LEU-C40 used for?
The Chint NB3LEU-C40 is used to provide overload, short-circuit and residual current protection for single-phase electrical circuits.
What current rating does this RCBO have?
The NB3LEU-C40 has a rated current of 40 A.
What does C curve mean?
A C curve RCBO trips between 5 and 10 times its rated current, making it suitable for circuits with moderate inrush currents from motors, transformers and similar loads.
What residual current sensitivity does it provide?
This RCBO provides a residual operating current sensitivity of 30 mA.
Does the NB3LEU-C40 provide over-current protection?
Yes, the NB3LEU-C40 provides overload, short-circuit and residual current protection in one compact device.
Trusted by Electrical Installers Worldwide
Chint RCBOs are widely used by electrical contractors, panel builders and maintenance engineers to deliver reliable circuit protection in residential, commercial and light industrial electrical installations.
