£357.08
The ABB DSE203NMC40A30 is a high-performance 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO) that combines overload, short-circuit and earth leakage protection within a single compact device. Designed for commercial, industrial and infrastructure applications, it delivers dependable protection while reducing the number of separate protective devices required in a distribution board.
Part of ABB's DSE203N M electronic RCBO range, this model features a 40 A rated current, Type C tripping characteristic, 30 mA Type A residual current protection and a 10 kA breaking capacity. Its electronic protection system, functional earth conductor and unswitched neutral make it ideal for protecting three-phase circuits supplying motors, HVAC systems, pumps, compressors and automation equipment.
The ABB DSE203NMC40A30 continuously monitors overload, short-circuit and earth leakage conditions. If a fault is detected, the RCBO rapidly disconnects the affected circuit, helping to protect connected equipment and improve personnel safety. The integrated design simplifies installation while providing dedicated protection for individual three-phase circuits.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Function | 3P+N eRCBO with overcurrent and earth fault protection, including additional protection against direct contacts (30 mA versions). |
| Residual Current Type | Type A. |
| Current Rating | C40 A. |
| Number of Poles | 3 poles + neutral (neutral unswitched). |
| Connection | Bottom power supply connection. |
| Terminal Capacity | Rigid 1–25 mm², Flexible 1–16 mm², Busbar 10 mm². |
| Operating Characteristic | Instantaneous trip characteristic. |
| Electrical Endurance | 10,000 cycles. |
| Mechanical Endurance | 20,000 cycles. |
| Neutral Terminals Position | Left side. |
It is a 3P+N electronic RCBO providing overload, short-circuit and Type A residual current protection.
The device has a rated current of 40 A.
The DSE203NMC40A30 uses a Type C tripping characteristic suitable for circuits with moderate inrush currents.
It provides 30 mA Type A residual current protection against AC and pulsating DC earth leakage currents.
The device has a rated short-circuit breaking capacity of 10 kA.
ABB DSE203N electronic RCBOs are widely trusted by electrical contractors, panel builders and industrial engineers for dependable protection, high performance and long-term reliability in modern low-voltage electrical installations.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...