£392.09
The ABB DSE203NMB20A10 is a compact and highly reliable 3P+N electronic residual current circuit breaker with overcurrent protection (eRCBO) designed to protect three-phase electrical installations against overloads, short circuits and earth leakage faults. Part of the advanced ABB DSE203N M series, it combines multiple protection functions into a single three-module device, making it ideal for commercial, industrial and OEM electrical applications.
Designed to simplify panel construction while improving electrical safety, the DSE203NMB20A10 features electronic residual current monitoring, an unswitched neutral and a compact DIN rail mounted design. Its robust construction and dependable operating characteristics make it suitable for demanding electrical distribution systems where reliable circuit protection is essential.
With a 20 A Type B tripping characteristic, 10 kA breaking capacity and 10 mA Type A residual current sensitivity, the ABB DSE203NMB20A10 is ideal for protecting three-phase circuits supplying resistive and low inrush current loads while providing enhanced protection against electric shock.
The ABB DSE203NMB20A10 continuously monitors electrical circuits for overloads, short circuits and earth leakage currents. If a fault is detected, the RCBO disconnects the circuit rapidly, helping protect electrical equipment, reduce downtime and improve safety for personnel.
Its Type B tripping characteristic is suitable for circuits supplying resistive loads and other equipment with relatively low inrush currents. The integrated 10 mA Type A residual current protection detects both AC and pulsating DC leakage currents, providing enhanced protection where increased electrical safety is required.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Function | 3P+N eRCBO with overcurrent, short-circuit, earth fault and indirect contact protection. |
| Residual Current Type | Type A. |
| Number of Poles | 3 poles + neutral (neutral unswitched). |
| Operating Characteristic | Instantaneous. |
| Rated Current | 20 A (B20 variant). |
| Connection Type | Bottom power supply connection. |
| Terminal Capacity | Busbar 10 mm², rigid cables 1–25 mm², flexible cables 1–16 mm². |
| Mechanical Endurance | 20,000 cycles. |
| Electrical Endurance | 10,000 cycles. |
| Position of Neutral Terminals | Left side. |
It provides combined protection against overloads, short circuits and earth leakage faults on three-phase electrical circuits.
The ABB DSE203NMB20A10 has a 20 A rated current.
Type B devices are intended for circuits with relatively low inrush currents, making them suitable for resistive loads and selected control circuits.
This RCBO provides 10 mA Type A residual current protection capable of detecting AC and pulsating DC earth leakage currents.
It is designed for DIN rail installation within commercial and industrial distribution boards, switchboards and machine control panels.
ABB DSE203N M electronic RCBOs are trusted by electrical contractors, panel builders and industrial engineers for dependable circuit protection, compact installation and reliable long-term performance in demanding electrical installations.
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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...