ABB TMAX XT3S 250 Circuit Breaker

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• 1. Product Overview

  The ABB TMAX XT3S 250 is a high-performance Molded Case Circuit Breaker (MCCB) from the ABB SACE Tmax XT series, designed for low-voltage power distribution and industrial electrical protection. It features a thermal-magnetic trip unit to quickly disconnect circuits during overload or short-circuit faults, ensuring the safety of electrical equipment and lines. The compact and modular design allows for accessory expansion, suitable for industrial, commercial, and infrastructure applications.

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  2. Technical Specifications

  Parameter	Specification
  Series	ABB SACE Tmax XT3S
  Model	XT3S 250 TMD
  Poles	3P (3 poles), optional 4P (with neutral)
  Frame Rated Current	250 A
  Rated Operational Current	250 A (adjustable depending on trip unit)
  Rated Voltage	≤ 690 V AC / ≤ 500 V DC
  Breaking Capacity	50 kA (voltage dependent)
  Protection Features	Thermal-magnetic trip (overload & short-circuit), optional auxiliary contacts / undervoltage trip
  Mechanical Life	~25,000 operations
  Mounting	Fixed panel or cabinet (FF)
  Terminals	Front bolt terminals, suitable for 85–192 mm² busbar
  Protection Rating	IP20
  Operating Temperature	-25 ℃ ~ +70 ℃
  Insulation Voltage	800 V
  Impulse Withstand Voltage	8 kV
  Standards	IEC/EN 60947‑2

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  3. Key Features and Benefits

  • Reliable protection: Quickly disconnects circuits during overload or short-circuit conditions.

  • High breaking capacity: Up to 50 kA for main and branch circuit protection.

  • Modular design: Supports auxiliary contacts, undervoltage trip, motor operators, and signaling modules.

  • Compact installation: Front-access terminals and compact size for panel or cabinet mounting.

  • Industrial standard compliance: Meets IEC/EN 60947‑2 for industrial and commercial applications.

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  4. Typical Applications

  • Low-voltage distribution main and branch circuit protection

  • Motor, pump, fan, and automation equipment power supply protection

  • Control panels and distribution boards

  • Commercial building and infrastructure power systems

  • Industrial applications: petrochemical, metallurgy, paper, mechanical processing

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  5. Installation & Usage Notes

  1. Power matching: Ensure rated current, voltage, and breaking capacity match the system requirements.

  2. Correct wiring: Follow wiring diagrams and secure terminals properly.

  3. Environmental conditions: Avoid high temperature, humidity, dust, and corrosive environments.

  4. Regular maintenance: Check trip units, mechanical operation, and terminal tightness.

  5. Accessory options: Install auxiliary contacts, undervoltage trips, or signaling modules as needed for remote monitoring and alarms.

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The structure and details of the product：

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