Why Choose the ABB DSE203NMB63A30 Electronic RCBO?
The ABB DSE203NMB63A30 is a compact three-phase plus neutral electronic residual current circuit breaker with overcurrent protection (eRCBO). It combines overload, short-circuit and earth leakage protection in one device, helping simplify distribution board design while providing dedicated protection for the connected electrical circuit.
Part of the ABB DSE203N M electronic RCBO range, this model is designed for commercial, industrial and building-services installations requiring dependable three-phase circuit protection. Its integrated design can reduce wiring complexity, conserve switchboard space and make fault identification more straightforward than arrangements using separate overcurrent and residual current devices.
The DSE203NMB63A30 features a rated current of 63 A, a Type B tripping characteristic and 30 mA Type A residual current protection. It is suitable for higher-load three-phase circuits supplying lighting, resistive heating, distribution equipment, control systems and other loads with relatively low or predictable starting currents.
Key Advantages
- Combined overload, short-circuit and earth leakage protection.
- 63 A rated current for higher-load three-phase circuits.
- 30 mA residual current sensitivity for additional protection against electric shock.
- Type A residual current detection for AC and pulsating DC fault currents.
- Type B tripping characteristic for loads with relatively low inrush currents.
- 10 kA short-circuit breaking capacity.
- Three-phase plus neutral configuration.
- Compact electronic RCBO design helps conserve switchboard space.
Key Features
- ABB DSE203N M electronic RCBO series.
- 63 A rated current.
- B-curve overcurrent tripping characteristic.
- 30 mA rated residual operating current.
- Type A residual current protection.
- 10 kA rated breaking capacity.
- Three protected phases plus neutral connection.
- Thermal overload protection.
- Magnetic short-circuit protection.
- Electronic earth leakage detection.
- Residual current test function.
- Contact position and earth fault trip indication.
Combined Protection for Three-Phase Circuits
The ABB DSE203NMB63A30 protects against several common electrical fault conditions. Its thermal mechanism responds to sustained overloads, while magnetic protection provides rapid disconnection during short-circuit events. The electronic residual current system monitors the balance of current flowing through the live conductors and neutral.
When earth leakage reaches the specified operating threshold, the RCBO disconnects the protected circuit. Integrating these protection functions within one device provides individual circuit protection and can prevent a fault on one circuit from unnecessarily interrupting unrelated electrical loads.
Type A Residual Current and B-Curve Protection
Type A residual current protection detects sinusoidal alternating residual currents and pulsating direct residual currents. This makes the DSE203NMB63A30 suitable for installations containing electronic controls, power supplies and other equipment that may generate pulsating DC leakage currents.
The Type B tripping characteristic is intended for circuits where high starting currents are not normally expected. Typical applications include resistive heating, lighting, electronic equipment, control systems and general-purpose distribution circuits, subject to the requirements of the electrical installation design.
Typical Applications
- Commercial distribution boards.
- Industrial switchboards and control panels.
- Higher-load three-phase lighting circuits.
- Resistive heating equipment.
- Building-services installations.
- Electronic control and automation systems.
- Workshops and light industrial facilities.
- General three-phase power distribution.
