£392.09
The ABB DSE203NMC20A100 is a high-performance 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO), engineered to provide dependable 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 combines advanced circuit protection within a single unit, making it ideal for commercial, industrial and OEM electrical systems.
Designed to maximise electrical safety and installation efficiency, the DSE203NMC20A100 continuously monitors residual current whilst protecting circuits against overload and short-circuit conditions. By integrating residual current and overcurrent protection into one device, it reduces panel space requirements, simplifies installation and improves overall system reliability.
With a 20 A Type C trip characteristic, 100 mA Type A residual current sensitivity and a 10 kA breaking capacity, the ABB DSE203NMC20A100 is ideally suited for protecting three-phase distribution circuits, machinery, automation equipment and industrial control systems. Its compact DIN rail mounted three-module construction enables straightforward installation within modern switchboards.
The ABB DSE203NMC20A100 combines miniature circuit breaker functionality with electronic residual current protection in one 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 C tripping characteristic is ideal for circuits supplying motors, transformers and equipment with moderate inrush currents. Combined with Type A residual current detection, it provides reliable protection for modern three-phase electrical installations.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Type | 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO). |
| Residual Current Type | Type A. |
| Current Rating | C20 A. |
| Protection Functions | Short-circuit, overload, earth fault, indirect and additional direct contact protection (30 mA versions). |
| Number of Poles Protected | 3 poles with neutral unswitched. |
| Connection Position | Bottom power supply connection, neutral terminals on the left. |
| Terminal Capacity | Busbar 10 mm²; rigid 1–25 mm²; flexible 1–16 mm². |
| Electrical Endurance | 10,000 cycles. |
| Mechanical Endurance | 20,000 cycles. |
It provides combined overcurrent and residual current protection for three-phase electrical circuits in industrial, commercial and OEM installations.
Type C RCBOs are intended for circuits with moderate inrush currents, making them suitable for motors, transformers 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, panel builders 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...