Why Choose the ABB DSE203NMB16A30 RCBO?
The ABB DSE203NMB16A30 is a compact and dependable residual current circuit breaker with overcurrent protection (RCBO) for three-phase plus neutral electrical circuits. It combines overload, short-circuit and earth leakage protection in one DIN rail-mounted device, reducing the number of separate protective components required within a distribution board.
As part of the ABB DSE203N RCBO series, the DSE203NMB16A30 is designed for low-voltage commercial, industrial and building-services installations. Its combined protection functions help simplify panel design, installation, testing and fault diagnosis while providing dedicated protection for the connected circuit.
The DSE203NMB16A30 features a rated current of 16 A, a Type B tripping characteristic and a rated residual operating current of 30 mA. Its Type A residual current detection is designed to respond to sinusoidal AC and pulsating DC residual currents, making the RCBO suitable for circuits supplying lighting, electronic equipment, controls and other loads with relatively low starting currents.
Key Advantages
- Combined overload, short-circuit and residual current protection.
- 16 A rated current for three-phase final circuits and electrical equipment.
- 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 curve for circuits with low or predictable inrush currents.
- Three-phase plus neutral configuration for four-wire electrical systems.
- Compact modular construction helps conserve distribution board space.
- Dedicated circuit protection assists with fault identification and maintenance.
Key Features
- ABB DSE203N RCBO series.
- 16 A rated current.
- B-curve overcurrent tripping characteristic.
- 30 mA rated residual operating current.
- Type A residual current protection.
- Three-phase plus neutral circuit configuration.
- Thermal protection against sustained overloads.
- Magnetic protection against short-circuit currents.
- Integrated protection against earth leakage faults.
- Test function for routine checking of the residual current mechanism.
- DIN rail mounting for modular electrical distribution boards.
Combined Protection for Three-Phase Circuits
An RCBO protects an electrical circuit against several common fault conditions. Its thermal protection responds to sustained overloads, while its magnetic mechanism provides rapid disconnection during short-circuit events. The residual current mechanism also monitors the balance of current flowing through the live conductors and neutral.
When leakage current flows to earth and reaches the specified operating threshold, the ABB DSE203NMB16A30 disconnects the protected circuit. Combining these functions in one device provides individual residual current protection and can reduce the likelihood of a fault unnecessarily interrupting unrelated 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 DSE203NMB16A30 suitable for circuits containing electronic controls, switch-mode 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. It is commonly applied to resistive loads, lighting circuits, socket circuits, electronic equipment and control systems, subject to the requirements of the electrical installation design.
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.
