£410.63
The ABB DSE203NMB40A100 is a high-performance 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO), engineered to provide reliable protection against overloads, short circuits and earth leakage faults in three-phase electrical installations. As part of the trusted ABB DSE203N M series, this compact protective device integrates multiple protective functions into a single unit, making it ideal for commercial, industrial and OEM applications.
Designed to maximise electrical safety and installation efficiency, the DSE203NMB40A100 continuously monitors residual current whilst protecting circuits against overload and short-circuit conditions. By combining overcurrent and residual current protection within one device, it reduces panel space requirements, simplifies installation and improves overall system reliability.
Featuring a 40 A Type B trip characteristic, 100 mA Type A residual current sensitivity and a 10 kA breaking capacity, the ABB DSE203NMB40A100 is ideally suited for protecting three-phase distribution systems, industrial machinery, automation equipment and commercial electrical installations. Its compact three-module DIN rail mounted construction enables straightforward installation within modern switchboards and control panels.
The ABB DSE203NMB40A100 combines miniature circuit breaker functionality with advanced electronic residual current protection within a single compact device. This simplifies installation whilst delivering 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 ideal for protecting sensitive electrical equipment, automation systems and three-phase distribution circuits requiring dependable fault protection.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Function | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Type of Residual Current | Type A with 30 mA versions for direct contact protection. |
| Contact Configuration | 3 protected poles plus neutral (unswitched neutral). |
| Electrical Endurance | 10,000 operational cycles. |
| Mechanical Endurance | 20,000 cycles. |
| Terminal Connection | Bottom power supply connection. |
| Connecting Capacity | Busbar 10 mm², rigid cables 1–25 mm², flexible cables 1–16 mm². |
| Operating Characteristic | Instantaneous tripping. |
| Position of Neutral Terminals | Left side. |
It provides combined overcurrent and residual current protection for three-phase electrical circuits in commercial, industrial and OEM applications.
Type B devices provide rapid magnetic tripping at relatively low fault current levels, making them suitable for protecting circuits with low inrush currents.
The 100 mA Type A residual current protection detects AC and pulsating DC earth leakage currents, helping improve electrical safety whilst protecting equipment and electrical 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 and OEM electrical equipment.
ABB DSE203N M RCBOs are trusted by electrical contractors, switchboard manufacturers 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...