£429.17
The ABB DSE203NMB50A100 is a premium 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO), designed to provide reliable protection against overloads, short circuits and earth leakage faults in three-phase electrical installations. Part of the trusted ABB DSE203N M series, this compact device combines overcurrent and residual current protection into a single unit, making it ideal for commercial, industrial and OEM applications.
Engineered to maximise electrical safety whilst reducing installation time and switchboard space, the DSE203NMB50A100 continuously monitors residual current while protecting circuits against overload and short-circuit conditions. Its integrated design reduces wiring complexity and improves overall system reliability.
Featuring a 50 A Type B trip characteristic, 100 mA Type A residual current sensitivity and a 10 kA breaking capacity, the ABB DSE203NMB50A100 is ideally suited for protecting sensitive three-phase distribution systems, industrial machinery, commercial installations and automation equipment.
The ABB DSE203NMB50A100 combines miniature circuit breaker functionality with advanced electronic residual current protection in a single compact device. This simplifies installation whilst providing dependable protection against overloads, short circuits and earth leakage faults across commercial and industrial electrical systems.
Its Type B tripping characteristic provides rapid magnetic operation for circuits with relatively low inrush currents, making it suitable for protecting sensitive electrical equipment, distribution circuits, automation systems and industrial control installations. Combined with Type A residual current detection, it delivers dependable protection for modern three-phase electrical systems.
| 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 plus neutral (neutral unswitched). |
| Operating Characteristic | Instantaneous. |
| Connecting Capacity | Busbar 10 mm², rigid 1–25 mm², flexible 1–16 mm². |
| Electrical Endurance | 10,000 cycles. |
| Mechanical Endurance | 20,000 cycles. |
| Position of Neutral Terminals | Left. |
| Earthing Switch Type | Undelayed. |
It provides combined overload, short-circuit and earth leakage protection for three-phase electrical circuits used in commercial, industrial and OEM installations.
Type B devices provide rapid magnetic tripping at relatively low fault current levels, making them suitable for circuits with low inrush currents and sensitive electrical equipment.
The 100 mA Type A residual current protection detects AC and pulsating DC earth leakage currents, helping improve electrical safety whilst protecting equipment and installations.
The device protects three phases with an unswitched neutral using a 3P+N configuration.
It is designed for DIN rail installation within commercial distribution boards, industrial control panels, OEM machinery and three-phase electrical installations.
ABB DSE203N M RCBOs are trusted by electrical contractors, panel builders and industrial engineers for delivering dependable circuit protection, compact installation and compliance with recognised international electrical standards.
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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...