ABB TMAX T5L 400 Molded Case Circuit Breaker

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1. Product Overview

The ABB TMAX T5L 400 Molded Case Circuit Breaker is a high-performance, compact low-voltage protection device designed for medium- and high-capacity power distribution systems. It offers excellent short-circuit and overload protection, ensuring stable operation of electrical networks. With a robust structure and flexible installation options, it is widely applied in industrial, commercial, and utility power systems.

2. Technical Specifications

1. Electrical Ratings

• Rated current (In): 400 A

• Rated insulation voltage (Ui): 750 V AC

• Rated operational voltage (Ue): 690 V AC

• Rated impulse withstand voltage (Uimp): 8 kV

• Number of poles: 3P or 4P

• Protection type: L type (long-time, short-time, instantaneous protection)

2. Breaking Capacity

• Ultimate short-circuit breaking capacity (Icu):

  • 36 kA (400 V AC)

• Service short-circuit breaking capacity (Ics):

  • 0.6 × Icu

3. Mechanical & Structural Data

• Operation: Manual or motorized (optional)

• Mounting: Fixed or withdrawable

• Mechanical endurance: Approx. 20,000 operations

• Protection class: IP40 (panel-mounted)

4. Available Accessories

• Undervoltage release

• Shunt trip

• Auxiliary/Alarm contacts

• Motor operator

• Remote control module

3. Advantages & Features

• High breaking capacity ensuring safe interruption of fault currents.

• Compact design suitable for various switchboards and panels.

• Modular accessories allow flexible protection and automation options.

• Excellent selectivity with upstream and downstream devices.

• High reliability and long mechanical life for harsh industrial environments.

• Easy maintenance and fast installation reduce downtime.

4. Application Fields

• Industrial power distribution systems

• Power generation and substations

• Commercial building switchboards

• Data centers and server rooms

• HVAC and building engineering systems

• Public infrastructure (hospitals, airports, rail systems)

5. Precautions

• Ensure the breaker rating matches the actual load before installation.

• Tighten all terminals securely to avoid overheating from poor connections.

• Avoid installation in humid or corrosive environments without proper enclosure.

• Regularly inspect the trip unit and mechanical components.

• Use only ABB-approved accessories for communication or remote-control functions.

The structure and details of the product：

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