£340.95
The ABB DSE203NMB25A30 is a compact 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO) designed to provide reliable protection against overloads, short circuits and earth leakage faults. By integrating multiple protective functions into a single device, it simplifies panel design while improving electrical safety for commercial and industrial installations.
As part of ABB's DSE203N M electronic RCBO range, this model incorporates Type A residual current protection, a Type B tripping characteristic and an unswitched neutral. It is suitable for protecting individual three-phase circuits where low to moderate inrush currents are expected, including lighting, heating, control panels and electronic equipment.
With a rated current of 25 A, 30 mA residual current sensitivity and a 10 kA breaking capacity, the DSE203NMB25A30 delivers dependable circuit protection while helping minimise nuisance tripping and simplifying fault isolation.
The DSE203NMB25A30 continuously monitors both overcurrent and earth leakage conditions. If an overload, short circuit or earth fault is detected, the device disconnects the protected circuit quickly to minimise equipment damage and improve personnel safety. Electronic residual current sensing provides consistent performance for modern electrical installations.
| Current | 25 A |
|---|---|
| Phase | Three Phase |
| Function | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Residual Current Type | Type A. |
| Contact Configuration | 3 protected poles plus neutral (neutral unswitched). |
| Protection Rating | Additional direct contact protection at 30 mA versions. |
| Connection Type | Bottom power supply connection with left-positioned neutral terminals. |
| Terminal Capacity | Busbar 10 mm², rigid conductors 1–25 mm², flexible conductors 1–16 mm². |
| Electrical Endurance | 10,000 cycles. |
| Mechanical Endurance | 20,000 cycles. |
| Operating Characteristic | Instantaneous earth fault undelayed switch. |
It is a three-phase plus neutral electronic RCBO providing overload, short-circuit and Type A residual current protection.
The device has a rated current of 25 A.
The RCBO provides 30 mA Type A residual current protection against AC and pulsating DC earth leakage currents.
The DSE203NMB25A30 features a Type B tripping characteristic suitable for circuits with relatively low inrush currents.
The device 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 dependable protection, compact installation and compliance with 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...