ABB SACE TMAX T3N125TW-4

1. Product Overview

The ABB SACE Tmax T3N125TW-4 is a low-voltage Molded Case Circuit Breaker (MCCB) manufactured by ABB, belonging to the compact Tmax T series circuit breakers. Designed for both AC and DC power distribution systems, this series complies with the IEC 60947-2 international standard and is widely applied in industrial, commercial and building electrical systems.

Model Code Interpretation

• T3: T3 size class of the Tmax series
• N: Standard breaking capacity grade
• 125: Rated current of 125A
• TW: Thermal-magnetic trip unit configuration
• 4: 4-pole configuration

2. Main Technical Parameters

Parameter Item	Specification Value
Rated Current (In)	125A
Frame Current	160A
Rated Insulation Voltage (Ui)	690V AC
Rated Operating Voltage (Ue)	415V AC (50-60Hz)
Ultimate Short-Circuit Breaking Capacity (Icu)	36kA-50kA (380/415V)
Operating Short-Circuit Breaking Capacity (Ics)	100% Icu
Number of Poles	4 Poles
Trip Unit Type	Thermal-magnetic Trip (TMD/TMF)
Mounting Type	Fixed Type
Wiring Method	Front Frame Connection (FFC)
Operating Temperature Range	-5°C to +40°C
Altitude	Up to 2000 meters
Ingress Protection Rating	IP20

3. Product Features

3.1 Safety Performance

• Double Insulation Design: Effectively prevents operators from contacting live parts during normal operation, ensuring personal safety.
• Visual Safety Contact Position Indication: Clearly displays the circuit breaker disconnection status for intuitive status judgment.
• Positive Operating Characteristics: Guarantees safe electrical isolation after disconnection to eliminate potential safety hazards.

3.2 Technical Advantages

• Modular Structure Design: Facilitates equipment upgrade, daily maintenance and component replacement, reducing operation and maintenance costs.
• Optional Trip Units: Supports both thermal-magnetic and electronic trip units, enabling flexible configuration according to diverse application scenarios.
• Compact Size: Delivers high short-circuit breaking capacity with a minimized structure, saving installation space effectively.
• Excellent Electromagnetic Compatibility: Complies with EMC standards, featuring strong anti-interference performance and stable operation in complex electromagnetic environments.

3.3 Environmental Adaptability

• Tropicalized Design: Adaptable to harsh climatic conditions such as high temperature, high humidity and salt fog.
• Shock and Vibration Resistance: Able to withstand mechanical shock and vibration, suitable for harsh industrial working conditions.
• Wide Temperature Adaptation Range: Stably operates in variable ambient temperature environments with strong environmental tolerance.

4. Structure and Composition

4.1 Main Components

The ABB T3N125TW-4 circuit breaker consists of five core components, with a complete and reliable internal structure:

• 1. Operating Mechanism
  • Manual operating handle
  • Interface for electric operation accessories
• 2. Contact System
  • Main contact assembly
  • Arc extinguishing chamber
• 3. Trip Unit
  • Thermal trip unit (for overload protection)
  • Magnetic trip unit (for short-circuit protection)
• 4. Wiring Terminals
  • Front wiring terminals
  • Compatible with 50mm² or 70mm² cables
• 5. Auxiliary Contacts
  • Optional signal contacts
  • Optional alarm contacts

4.2 Physical Dimensions

• Width: Approx. 105mm (per pole)
• Height: Approx. 205mm
• Depth: Approx. 103.5mm
• Weight: 2-3kg (varies with specific configurations)

5. Application Fields

5.1 Industrial Power Distribution Systems

• Main power distribution cabinets for factories
• Workshop power distribution boxes
• Motor Control Center (MCC)

5.2 Commercial Buildings

• Power distribution for commercial complexes
• Power distribution for office buildings
• Commercial lighting control systems

5.3 Special Industrial Scenarios

• Coal mine electrical systems
• Railway tunnel power supply systems
• Solar photovoltaic power generation systems
• Port and terminal power distribution systems
• Marine electrical systems

5.4 Motor Protection

• Motor overload protection
• Motor short-circuit protection
• Motor starting current protection

5.5 DC Power Systems

• DC power distribution of 24V DC and above
• DC traction power supply systems
• Energy storage system protection

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