Why Choose the ABB DSE203NMC10A30 RCBO?
The ABB DSE203NMC10A30 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 one DIN rail-mounted device, helping improve electrical safety while reducing the space required inside a distribution board.
As part of the 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 DSE203NMC10A30 has a rated current of 10 A, a Type C 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 modern electronic equipment, control systems and loads with moderate 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 C tripping curve suitable for equipment with moderate inrush currents.
- Three-phase plus neutral configuration for four-wire electrical systems.
- Compact DIN rail installation helps conserve distribution board space.
- Individual circuit protection simplifies fault finding and maintenance.
Key Features
- ABB DSE203N RCBO series.
- 10 A rated current.
- C-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 DSE203NMC10A30 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 C-Curve Protection
Type A residual current protection detects sinusoidal alternating residual currents and pulsating direct residual currents. This makes the DSE203NMC10A30 suitable for circuits containing electronic controls, power supplies and other modern electrical equipment that may produce pulsating DC leakage currents.
The Type C tripping characteristic allows the RCBO to tolerate moderate starting currents while still providing effective short-circuit protection. It is commonly selected for circuits supplying small motors, control transformers, fluorescent lighting, pumps, fans and commercial electrical equipment.
Typical Applications
- Three-phase commercial distribution boards.
- Industrial control and automation circuits.
- Small motors, pumps and ventilation equipment.
- Control transformers and inductive electrical loads.
- Lighting and building services circuits.
- Electronic control equipment and power supplies.
- Workshops and light industrial installations.
- Electrical panels requiring individual residual current protection.
