ABB 1SDA054321R1 Molded Case Circuit Breaker

• ABB 1SDA054321R1 Molded Case Circuit Breaker (MCCB)

  1. Product Overview

  The ABB 1SDA054321R1 is a high‑performance Molded Case Circuit Breaker (MCCB) from the SACE Tmax T5N series. It is designed for low‑voltage distribution systems to provide protection against overload, short‑circuit and isolation. This breaker integrates a robust trip unit and provides reliable electrical protection for industrial and commercial power systems.SpareCrux

  2. Technical Specifications

  • Model: 1SDA054321R1

  • Type: Molded Case Circuit Breaker (MCCB)

  • Series: SACE Tmax T5N

  • Poles: 3‑pole

  • Rated Current (In): 400 A

  • Rated Operating Voltage: 690 V AC

  • Rated Insulation Voltage (Ui): 1000 V

  • Rated Impulse Withstand Voltage (Uimp): 8 kV

  • Ultimate Short‑Circuit Breaking Capacity (Icu): 36 kA at 400 V AC

  • Service Short‑Circuit Breaking Capacity (Ics): 36 kA at 400 V AC

  • Rated Uninterrupted Current (Iu): 400 A

  • Short‑Time Withstand Current (1 s): ~10 kA

  • Mechanical Life: ~20,000 operations

  • Electrical Life: ~7,000–8,000 operations

  • Mounting: Fixed mount

  • Protection Class: IP20

  • Dimensions (W×H×D): approx. 140 × 205 × 103.5 mm

  • Weight: approx. 3.25 kg

  • Terminal Type: Front fixed terminals

  • Optional Trip Unit: PR222DS/P‑LSI solid‑state trip unit

  • Typical Uses: Distribution, isolation and motor starting protectionSpareCrux+1

  3. Advantages and Features

  1. Comprehensive Protection — Protects circuits from overload and short‑circuit damage.

  2. High Breaking Capacity — 36 kA breaking capacity suitable for industrial short‑circuit conditions.

  3. Electronic Trip Unit Option — Solid‑state trip unit allows precise protection setting.

  4. Durable Performance — Long mechanical and electrical life ensures reliability.

  5. Compact Design — Space‑saving size ideal for modern panel installations.SpareCrux

  4. Typical Applications

  • Main and feeder protection in distribution boards

  • Motor Control Centers (MCC)

  • Commercial building power distribution

  • Load isolation and safety protection

  • Electrical device protection and maintenance isolation
    Suitable for low‑voltage distribution, feeder protection and motor starting applications.SpareCrux

  5. Installation and Usage Notes

  • Ensure power is disconnected before installation to ensure safety.

  • Confirm breaker rated current matches the load to avoid nuisance tripping or overload.

  • Follow wiring diagrams carefully and tighten terminal connections securely.

  • Periodically inspect terminals, handles and trip unit for reliability.

  • Avoid prolonged use in high humidity, corrosive or high EMI environments; add protective measures if necessary.SpareCrux

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The structure and details of the product：

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