2CSR256440R3104 ABB DS203NC C10 APR300 RCBO 3P+N 10 A 300 mA

Why Choose the ABB DS203NC C10 APR300 RCBO?

The ABB DS203NC C10 APR300, order code 2CSR256440R3104, is a compact 3P+N residual current circuit breaker with overcurrent protection (RCBO) designed to protect three-phase circuits against overloads, short circuits and earth fault currents. Part of the ABB DS200 / DSH200 RCBO product group, this Type A APR device combines residual-current and overcurrent protection in a space-saving four-module format for commercial and industrial electrical installations.

The DS203NC C10 APR300 provides protection against sinusoidal alternating and pulsating DC residual currents while incorporating circuit-breaker protection against overload and short-circuit conditions. Its Type A APR high-immunity characteristic provides enhanced resistance to unwanted tripping caused by transient disturbances, helping improve continuity of service in modern electrical installations.

With a rated current of 10 A, C tripping characteristic, 300 mA rated residual operating current and 6 kA rated short-circuit breaking capacity, the DS203NC C10 APR300 provides comprehensive protection for three-phase systems with neutral. Its compact 3P+N four-module design combines multiple protection functions in a single DIN rail device while helping minimise distribution-board space.

Key Advantages

• Combined residual current, overload and short-circuit protection in one device.
• 10 A rated current with C-curve overcurrent tripping characteristic.
• 300 mA residual current sensitivity for earth fault protection.
• Type A detection for sinusoidal AC and pulsating DC residual currents.
• APR high-immunity design provides increased resistance to unwanted tripping.
• 3P+N configuration designed for three-phase circuits with neutral.
• 6 kA rated short-circuit breaking capacity for dependable circuit protection.
• Compact four-module construction reduces distribution-board space compared with separate residual-current and overcurrent protection devices.

Key Features

• ABB DS203NC RCBO series.
• 10 A rated current.
• C tripping characteristic.
• 300 mA rated residual current (IΔn).
• Type A APR residual current protection.
• High immunity to unwanted tripping for improved continuity of service.
• 3P+N pole configuration with three protected poles.
• 6 kA rated short-circuit breaking capacity (Icn).
• Test pushbutton for verification of correct residual-current protection operation.
• Earth fault indicator assists with rapid identification of residual-current trips.
• Contact position indicator provides clear visual indication of contact status.
• Compact four-module DIN rail format for space-efficient switchboard installation.

High-Immunity Protection for Three-Phase Circuits

An RCBO combines residual-current protection with overload and short-circuit protection within a single device. The ABB DS203NC C10 APR300 therefore protects connected circuits against excessive current while detecting earth leakage currents that could create electrical hazards, damage equipment or contribute to electrically initiated fires.

ABB APR residual-current protection is designed for applications where improved immunity to unwanted tripping is required. This makes the DS203NC C10 APR300 particularly useful in commercial and industrial installations where transient disturbances can occur, while its 300 mA residual-current threshold provides earth fault protection and the compact four-module format helps conserve valuable switchboard space.

Typical Applications

• Three-phase commercial electrical distribution systems.
• Industrial distribution boards and switchboards.
• Circuits requiring combined overcurrent and 300 mA residual-current protection.
• Installations requiring increased resistance to unwanted RCD tripping.
• Three-phase equipment and machinery distribution circuits.
• Commercial and industrial installations requiring compact combined circuit protection.