£340.95
The ABB DSE203NMC20A30 is a high-performance three-phase plus neutral electronic residual current circuit breaker with overcurrent protection (eRCBO) designed to provide comprehensive protection against overloads, short circuits and earth leakage faults. Combining multiple protective functions into a single compact device helps reduce panel space while improving electrical safety and simplifying installation.
As part of the advanced ABB DSE203N electronic RCBO series, this device is ideal for commercial, industrial and infrastructure applications requiring reliable individual circuit protection. Its electronic residual current detection, robust construction and compact design make it suitable for modern distribution boards and electrical installations.
With a rated current of 20 A, a Type C tripping characteristic and 30 mA Type A residual current protection, the DSE203NMC20A30 is suitable for circuits supplying motors, pumps, HVAC equipment, lighting, automation systems and other electrical loads with moderate inrush currents. The device features an unswitched neutral and flying leads for straightforward installation in chassis distribution boards.
The ABB DSE203NMC20A30 continuously monitors overload, short-circuit and earth leakage conditions to provide rapid disconnection whenever abnormal operating conditions occur. Combining these protective functions within one compact device improves installation efficiency while delivering dedicated protection for individual three-phase circuits.
Its electronic residual current technology provides dependable protection for modern electrical systems, while the 30 mA sensitivity offers additional protection against indirect contact and enhanced protection against direct contact where required.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Type | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Residual Current Type | Type A, 30 mA versions provide additional direct contact protection. |
| Neutral Configuration | Unswitched neutral, neutral terminals positioned on the left. |
| Rated Current | 20 A. |
| Operating Characteristic | Instantaneous trip. |
| Electrical Endurance | 10,000 cycles. |
| Mechanical Endurance | 20,000 cycles. |
| Connecting Capacity | Busbar 10 mm², rigid 1–25 mm², flexible 1–16 mm² conductors. |
| Position of Power Supply Connection | Bottom. |
The ABB DSE203NMC20A30 protects three-phase electrical circuits against overloads, short circuits and earth leakage faults using a single electronic RCBO.
This model has a rated current of 20 A with a Type C tripping characteristic.
The device provides 30 mA Type A residual current protection, detecting both AC and pulsating DC earth leakage currents.
The DSE203NMC20A30 has a 10 kA short-circuit breaking capacity, making it suitable for demanding commercial and industrial installations.
No. The device features an unswitched neutral configuration with neutral terminals positioned on the left-hand side.
ABB DSE203N electronic RCBOs are widely used by electrical contractors, panel builders and industrial engineers to deliver dependable circuit protection, reliable earth leakage detection and efficient installation in 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...