2CSR256440R2204 ABB DS203NC C20 APR100 RCBO 3P+N 20 A 100 mA

Why Choose the ABB DS203NC C20 APR100 RCBO?

The ABB DS203NC C20 APR100, order code 2CSR256440R2204, 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 C20 APR100 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, with increased surge-current withstand and short-time delayed operation helping to maintain continuity of service where transient disturbances are present.

With a rated current of 20 A, C tripping characteristic, 100 mA rated residual operating current and 6 kA rated short-circuit breaking capacity, the DS203NC C20 APR100 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.
• 20 A rated current with C-curve overcurrent tripping characteristic.
• 100 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 according to IEC/EN 61009-1.
• Compact four-module construction reduces distribution-board space compared with separate RCD and MCB protection.

Key Features

• ABB DS203NC RCBO series.
• 20 A rated current.
• C tripping characteristic.
• 100 mA rated residual current (IΔn).
• Type A APR residual current protection.
• High immunity to unwanted tripping with short-time delayed operation.
• 3P+N pole configuration with three protected poles and four-pole switching.
• 6 kA rated short-circuit breaking capacity (Icn).
• 10 kA ultimate short-circuit breaking capacity (Icu) according to IEC/EN 60947-2.
• 3 kA surge-current withstand with an 8/20 µs impulse waveform.
• Test pushbutton for verification of correct residual-current protection operation.
• Earth fault indicator and contact position indicator assist with fault identification and maintenance.
• 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 C20 APR100 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 to provide an effective balance between safety and continuity of service. Its increased immunity to transient disturbances, 3 kA surge-current withstand and 10 ms short-time delay reduce the risk of unwanted tripping, making the DS203NC C20 APR100 particularly suitable for commercial and industrial installations where dependable operation is important.

Typical Applications

• Three-phase commercial electrical distribution systems.
• Industrial distribution boards and switchboards.
• Circuits requiring combined overcurrent and 100 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.