£373.19
The ABB DSE203NMB50A30 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 installations, it provides dependable circuit protection while reducing the number of separate protective devices required within a distribution board.
As part of ABB's DSE203N M electronic RCBO range, this model features a 50 A rated current, a Type B tripping characteristic, 30 mA Type A residual current protection and an unswitched neutral. It is designed for protecting three-phase circuits supplying lighting, heating, control equipment, distribution circuits and other applications with relatively low or predictable inrush currents.
With a 10 kA breaking capacity, electronic residual current sensing and integrated overload protection, the DSE203NMB50A30 delivers reliable protection for modern low-voltage electrical installations while helping simplify maintenance and fault finding.
The ABB DSE203NMB50A30 continuously monitors overload, short-circuit and earth leakage conditions. When a fault is detected, the RCBO disconnects the protected circuit rapidly, helping protect connected equipment and improve electrical safety. Integrating these protective functions into one device reduces installation complexity while providing dedicated protection for individual three-phase circuits.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Function | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Type of Residual Current | Type A. |
| Number of Poles | 3 poles + neutral (neutral unswitched). |
| Operating Characteristic | Instantaneous. |
| Connection Type and Range | Bottom power supply connection; terminals accept busbar 10 mm², rigid cables 1–25 mm², flexible cables 1–16 mm². |
| Mechanical Endurance | 20,000 cycles. |
| Electrical Endurance | 10,000 cycles. |
| Position of Neutral Terminals | Left side. |
It is a three-phase plus neutral electronic RCBO that combines overload, short-circuit and Type A residual current protection within one compact device.
The ABB DSE203NMB50A30 has a rated current of 50 A.
This model features a Type B tripping characteristic, making it suitable for circuits with relatively low or predictable inrush currents.
The device provides 30 mA Type A residual current protection for AC and pulsating DC earth leakage currents.
The DSE203NMB50A30 has a rated short-circuit breaking capacity of 10 kA.
ABB DSE203N electronic RCBOs are trusted by electrical contractors, panel builders and industrial engineers for reliable protection, compact installation and dependable performance in modern low-voltage electrical systems.
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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...