ABB 1SDA054396R1 Automatic Molded Case Circuit Breaker

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1. Product Model & Basic Introduction

This product is the ABB SACE Tmax T series T5N 630 PR221DS-LS/I (3-pole, fixed front-terminal, electronic trip) — model number 1SDA054396R1. It is a low-voltage moulded-case circuit breaker (MCCB) designed for rated current of 630 A in three-phase AC systems.

2. Technical Specifications

• Rated operational current (In): 630 A.

• Number of poles: 3.

• Rated operational voltage (Ue): up to 690 V AC.

• Rated insulation voltage (Ui): 1000 V.

• Rated impulse withstand voltage (Uimp): 8 kV.

• Rated service short-circuit breaking capacity (Ics):

  • 220 V AC: 70 kA

  • 230 V AC: 70 kA

  • 380–415 V AC: 36 kA

  • 440 V AC: 30 kA

  • 500 V AC: 25 kA

  • 690 V AC: 20 kA

• Rated ultimate short-circuit breaking capacity (Icu): same as Ics.

• Electrical durability: 5000 operations (~60 ops/hour).

• Mechanical durability: 20 000 operations (~120 ops/hour).

• Dimensions / Weight: Width ~140 mm, Height 205 mm, Depth 103.5 mm, Weight ~4.817 kg.

• Power loss: Approx. 41 W per pole at rated conditions.

• Mounting type: Fixed, front-terminal connection.

• Trip unit: PR221DS-LS/I electronic trip.

3. Advantages and Features

• High interruption capability: The breaker can handle high short-circuit currents (up to 70 kA at low voltages) and still perform reliably in mid to high voltage environments (20–36 kA).

• Modular series family: As part of the SACE Tmax T family, it supports a wide current range (up to 1600 A+), enabling uniformity in design and scalability.

• Electronic trip unit: The PR221DS provides advanced protection functions (overload, short-circuit, adjustable delay), offering more accurate and reliable protection.

• Low thermal loss: With low power dissipation under rated load (~41 W/pole), it reduces heat build-up in distribution cabinets.

• Compact footprint: Despite 630 A rating, the breaker has a relatively compact size, facilitating installation even in space-constrained panels.

• Excellent selectivity and coordination capability: The Tmax series is designed for selective coordination between upstream and downstream protective devices, enhancing system reliability.

• Compliance with international standards: Designed according to IEC norms, with good insulation and mechanical/ electrical robustness.

4. Typical Application Areas

• Main and sub-distribution panels in industrial plants.

• Heavy-duty load circuits such as large motors, compressors, pump systems.

• Low-voltage distribution in power generation and substation environments.

• Commercial and large-scale building electrical systems (data centres, hospitals, transport hubs).

• Critical power supply circuits in manufacturing and infrastructure.

• Protection and isolation for equipment in manufacturing systems.

5. Usage Notes & Precautions

• Prior to installation, verify that the breaker’s rated current, short-circuit capacity and number of poles are suitable for the system.

• Ensure that the busbar system and distribution panel’s short-circuit level match the breaker’s Ics/Icu ratings to prevent failure or unsafe operation.

• Install in areas with adequate ventilation, controlled temperature and minimal dust/humidity to preserve performance and longevity.

• When wiring terminals, ensure connections are tight, conductor size is appropriate, and contact is secure to prevent overheating or loosening.

• Schedule periodic inspection and maintenance: look for signs of overheating, unusual noise, tripping anomalies; clean and test as required.

• In high short-circuit current systems, consider selective coordination with upstream devices to optimise fault isolation and reduce downtime.

• Avoid operating beyond specification (over-current, excessive ambient temperature, repeated overloads) as this may shorten lifespan or cause mis-operation.