2CSR256440R3254 ABB DS203NCC25APR300 DS203NC C25 APR300 3P+N APR RCBO 25A 300mA

Why Choose the ABB DS203NCC25APR300 RCBO?

The ABB DS203NCC25APR300 is a compact 3P+N residual current circuit breaker with overcurrent protection (RCBO) designed to protect three-phase electrical circuits against overloads, short circuits and residual earth-fault currents. As part of the ABB DS203NC series, it combines residual-current and overcurrent protection in a single modular device for efficient commercial and industrial electrical distribution.

This RCBO features a 25 A rated current, C tripping characteristic and APR residual-current characteristic with 300 mA sensitivity. ABB APR technology provides enhanced immunity to transient disturbances that can cause unwanted residual-current tripping, supporting improved continuity of service in installations containing electronic equipment and disturbance-producing loads.

With a rated residual operating current of 300 mA and a rated short-circuit breaking capacity of 6 kA according to EN/IEC 61009, the DS203NCC25APR300 provides coordinated overcurrent and earth-fault protection. Its compact 3P+N four-module construction incorporates three protected poles and a switched neutral, while the C characteristic accommodates moderate starting and inrush currents.

Key Advantages

• Combined residual-current, overload and short-circuit protection in one device.
• 3P+N configuration for three-phase circuits with neutral.
• 25 A rated current with C tripping characteristic.
• 300 mA APR residual-current protection.
• APR characteristic provides enhanced immunity to transient disturbances and unwanted tripping.
• 6 kA rated short-circuit breaking capacity according to EN/IEC 61009.
• Compact four-module format helps conserve distribution-board space.
• Type C characteristic accommodates moderate starting and inrush currents.
• DIN-rail construction enables straightforward integration into modular distribution equipment.

Key Features

• ABB DS203NC RCBO series.
• 3P+N configuration with three protected poles.
• 25 A rated current.
• C tripping characteristic.
• APR residual-current characteristic.
• 300 mA rated residual operating current.
• Enhanced immunity to transient disturbances for reduced unwanted tripping.
• 400–415 V AC rated voltage.
• 50/60 Hz rated frequency.
• 6 kA Icn breaking capacity according to EN/IEC 61009.
• 10 kA ultimate short-circuit breaking capacity according to IEC 60947-2.
• Compact four-module DIN-rail format.

Reliable High-Immunity Protection for Three-Phase Circuits

The ABB DS203NCC25APR300 combines the protective functions of a miniature circuit breaker and a residual-current device in one unit. It responds to overload and short-circuit conditions while monitoring residual current flowing to earth, providing coordinated protection for conductors, connected equipment and electrical installations.

Its APR characteristic provides increased immunity to transient disturbances that can cause unwanted operation of conventional residual-current devices. Combined with 300 mA residual-current sensitivity and a C tripping characteristic, the DS203NCC25APR300 is suited to installations requiring earth-fault protection together with improved continuity of service.

Typical Applications

• Three-phase commercial electrical distribution systems.
• Industrial electrical distribution boards.
• Circuits requiring 300 mA residual-current protection.
• Installations where transient disturbances may cause unwanted residual-current tripping.
• Machinery and equipment circuits with moderate starting currents.
• Commercial and industrial circuits containing electronic equipment.
• Compact switchboards and modular DIN-rail distribution equipment.