£410.63
The ABB DSE203NMC40A300 is a high performance 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO) designed to provide dependable protection against overloads, short circuits and earth leakage faults in commercial and industrial electrical installations. As part of the advanced ABB DSE203N M series, it combines multiple protection functions into a compact three-module device, making it ideal for distribution boards, switchgear and OEM control panels.
Designed for modern electrical systems, the DSE203NMC40A300 incorporates Type A residual current protection, enabling detection of both alternating and pulsating DC earth fault currents. Its electronic operating mechanism provides reliable protection while reducing installation space and simplifying panel layouts. The neutral pole remains unswitched, ensuring dependable protection across three-phase electrical systems.
With a 40 A C-curve rating, 300 mA residual current sensitivity and compatibility with a three-phase 400/415 V AC supply, the DSE203NMC40A300 is ideally suited to industrial machinery, commercial electrical installations and OEM equipment requiring reliable circuit protection.
Electronic RCBOs combine miniature circuit breaker and residual current protection into a single device, providing comprehensive protection against overloads, short circuits and earth leakage faults while reducing installation space and simplifying electrical installations.
The ABB DSE203N M series has been developed for commercial, industrial and OEM applications where dependable protection, easy installation and long service life are essential. Electronic residual current technology ensures consistent performance under demanding operating conditions.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| Function | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Residual Current Type | Type A, 30 mA for additional direct contact protection. |
| Poles | 3 poles plus neutral (neutral unswitched). |
| Operating Characteristic | Instantaneous tripping. |
| Connection | Bottom power supply connection; neutral terminals positioned on left. |
| Terminal Capacity | Busbar 10 mm², rigid cables 1–25 mm², flexible cables 1–16 mm². |
| Electrical Endurance | 10,000 cycles. |
| Mechanical Endurance | 20,000 cycles. |
| Weight | 0.549 kg. |
It protects three-phase electrical circuits against overloads, short circuits and earth leakage faults in commercial and industrial installations.
The device has a 40 A rated current with a C characteristic trip curve.
The DSE203NMC40A300 provides Type A 300 mA residual current protection, detecting alternating and pulsating DC residual currents.
It features a 3P+N configuration with an unswitched neutral.
It is designed for DIN rail installation inside industrial control panels, switchboards and commercial distribution boards.
ABB DSE203N M electronic RCBOs are trusted by electricians, panel builders and industrial engineers for delivering dependable circuit protection, robust construction and long-term reliability.
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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...