£410.63
The ABB DSE203NMC40A100 is a high-performance 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. As part of the proven ABB DSE203N M series, this compact protective device integrates multiple protection functions into a single unit, making it ideal for commercial, industrial and OEM applications.
Designed to maximise electrical safety and installation efficiency, the DSE203NMC40A100 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 C trip characteristic, 100 mA Type A residual current sensitivity and a 10 kA breaking capacity, the ABB DSE203NMC40A100 is ideally suited to protecting three-phase distribution systems, industrial machinery, HVAC equipment, automation systems and commercial electrical installations. Its compact three-module DIN rail mounted construction enables straightforward installation within modern switchboards and control panels.
The ABB DSE203NMC40A100 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 C tripping characteristic makes it particularly suitable for circuits supplying motors, transformers, HVAC systems, compressors and other equipment with moderate inrush currents. Combined with Type A residual current detection, it delivers reliable protection for modern three-phase installations.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Type | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Residual Current Type | Type A. |
| Number of Poles | 3 poles plus neutral (unswitched neutral). |
| Operating Characteristic | Instantaneous. |
| Rated Current | 40 A. |
| Connection Type | Bottom power supply connection. |
| Terminal 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 Terminal | Left side. |
It provides combined overcurrent and residual current protection for three-phase electrical circuits in commercial, industrial and OEM installations.
Type C devices are designed for circuits with moderate inrush currents, making them ideal for motors, transformers, compressors and industrial electrical equipment.
The 100 mA Type A residual current protection detects AC and pulsating DC earth leakage currents, helping improve electrical safety and equipment protection.
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...