ABB DS951-A Type A residual current circuit breaker (RCCB)

Description

ABB DS951-A Type A residual current circuit breaker (RCCB)

The ABB DS951-A is a compact 1P+N Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed to safeguard single-phase circuits against overloads, short circuits, and earth fault currents.

Product Overview

• Series: ABB DS951 (System pro M compact® family).
• Type A Sensitivity: The “A” suffix means it detects both sinusoidal AC residual currents and pulsating DC earth fault currents, making it suitable for modern electronics.
• All-in-One Protection: Combines a Miniature Circuit Breaker (MCB) and a Residual Current Device (RCD) in a single DIN-rail device.
• Lifecycle Note: The DS951 series is now marked as obsolete by ABB and is commonly replaced by newer System pro M compact RCBO series (such as DS201).

  ABB

Technical Specifications

Note: DS951-A denotes the base series and Type A trip class. Exact current ratings depend on the full catalog code (such as DS951 A-C16/0.03).

ABB

• Poles: 1P + N (Single Pole + Switched Neutral)

  ABB

• Rated Operational Voltage (UeU_eUe​): 230–240 V AC (50/60 Hz)
• Rated Breaking Capacity (IcnI_{cn}Icn​): 6 kA

  ABB

• Residual Current Type: Type A (AC and pulsating DC fault sensitivity)

  ABB

• Typical Rated Residual Current (IΔnI_{\Delta n}IΔn​): 30 mA (0.03 A)

  ABB

• Tripping Characteristics: B or C curve (commonly C curve for inductive/general loads)
• Mounting: 35 mm DIN rail
• Compliance Standards: IEC/EN 61009-1, IEC/EN 61009-2-1

  ABB

Key Advantages

• Space-Saving Footprint: Fits a full 1P+N breaker and ground-fault sensor into a compact width, saving valuable space inside distribution boards.
• Individual Circuit Isolation: Protects single branch circuits individually so an earth fault on one line won’t trip the entire panel.
• Electronics-Safe Detection: Type A sensing prevents nuisance blinding from rectified DC leakage produced by modern appliances, LED drivers, and IT equipment.
• System Compatibility: Integrates cleanly with standard System pro M compact busbars and auxiliary accessories.

  Galco

Important Installation & Usage Precautions

• Verify the Full Part Number: Before ordering or installing, confirm the exact amperage (e.g., 10 A, 16 A, 20 A), trip curve (B or C), and sensitivity (e.g., 30 mA) on the device faceplate.

  ABB

• Line and Load Polarity: Follow the terminal markings strictly for Line (L) and Neutral (N) connections to ensure proper internal electronics operation and neutral switching.
• Insulation Testing: Disconnect the RCBO before performing high-voltage megger/insulation resistance tests on branch wiring to avoid damaging the internal sensing circuitry.
• Regular Testing: Press the built-in “T” (Test) button periodically to verify the mechanical trip mechanism operates smoothly.

Applications

• Residential & Commercial Sub-Panels: Protects socket outlets, lighting circuits, bathrooms, and outdoor power lines against electric shock.
• Light Industrial Control Cabinets: Safeguards single-phase PLC power supplies, control transformers, and small auxiliary motors.
• IT & Office Equipment Circuits: Ideal for branch circuits powering computers, servers, and variable-speed office equipment that generate pulsating DC leakage.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Please make an inquiry for more models：