Why Choose the ABB DSE203NMB10A30 RCBO?
The ABB DSE203NMB10A30 is a compact and reliable three-phase plus neutral residual current circuit breaker with overcurrent protection (RCBO). It combines protection against overloads, short circuits and earth leakage currents within a single DIN rail-mounted device, helping enhance electrical safety while reducing the space required inside a distribution board.
As part of the established ABB DSE203N RCBO series, this protective device is designed for commercial, industrial and advanced residential electrical installations. By combining the functions of a miniature circuit breaker and a residual current device, it simplifies system design, installation, testing and fault identification.
The DSE203NMB10A30 has a rated current of 10 A, a Type B tripping characteristic and a rated residual operating current of 30 mA. Its Type A residual current detection provides protection against sinusoidal AC and pulsating DC residual currents, making it suitable for circuits supplying electronic equipment, lighting, control systems and loads with low starting currents.
Key Advantages
- Combined overload, short-circuit and residual current protection.
- 10 A rated current for three-phase final circuits and control systems.
- 30 mA earth leakage sensitivity for additional protection against electric shock.
- Type A residual current detection for AC and pulsating DC fault currents.
- Type B tripping curve suitable for circuits with low inrush currents.
- Three-phase plus neutral configuration for four-wire electrical systems.
- Compact DIN rail installation helps conserve distribution board space.
- Individual circuit protection can simplify fault finding and maintenance.
Key Features
- ABB DSE203N RCBO series.
- 10 A rated current.
- B-curve instantaneous tripping characteristic.
- 30 mA rated residual operating current.
- Type A residual current protection.
- Three protected phases with switched neutral functionality.
- Thermal protection against sustained overloads.
- Magnetic protection against short-circuit currents.
- Integrated protection against earth leakage faults.
- Test button for routine verification of the residual current mechanism.
- Modular DIN rail mounting for electrical distribution boards.
Combined Protection for Three-Phase Circuits
An RCBO protects an electrical circuit against multiple fault conditions. Thermal and magnetic protection elements disconnect the supply during sustained overloads or short-circuit events, while the residual current mechanism continuously monitors the balance of current flowing through the live conductors and neutral.
When an earth leakage current reaches the specified operating threshold, the ABB DSE203NMB10A30 rapidly disconnects the protected circuit. Combining these protective functions within one device provides dedicated residual current protection and can help prevent a fault on one circuit from unnecessarily disconnecting other circuits.
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 DSE203NMB10A30 suitable for circuits containing electronic controls, switch-mode power supplies and other modern electrical equipment that may produce pulsating DC leakage currents.
The Type B tripping characteristic provides rapid magnetic operation at relatively low multiples of the rated current. It is commonly selected for resistive loads, lighting circuits, electronic equipment and control systems where high starting currents are not normally expected.
Typical Applications
- Three-phase commercial distribution boards.
- Industrial control and automation circuits.
- Lighting and building services circuits.
- Resistive heating and low-inrush electrical loads.
- Electronic control equipment and power supplies.
- Commercial premises and infrastructure systems.
- Workshops and light industrial installations.
- Electrical panels requiring individual residual current protection.
