ABB T3N225

Description

Product Overview

The ABB T3N225 is a high-performance thermal-magnetic circuit breaker from ABB’s Tmax XT series of molded case circuit breakers (MCCBs). This device serves a critical protection role in industrial control panels and motor control centers (MCCs), providing reliable protection against both overloads (thermal function) and short-circuit faults (magnetic function) for electrical circuits. The robust design and interrupting capacity of the ABB T3N225 make it a key component for safeguarding feeders, motors, and other electrical equipment in automation systems.

Key Product Parameters

• Product Type: Thermal-Magnetic Molded Case Circuit Breaker (MCCB)

• Product Line: ABB Tmax XT Series

• Frame Size: T3 (indicating the physical size and basic frame)

• Rated Current (Iu): 225 Amperes. This is the maximum continuous current the breaker is designed to carry.

• Breaking Capacity (Icu): Very high short-circuit interrupting capacity, typically in the range of 50kA to 100kA at 415VAC, depending on the specific version.

• Number of Poles: Typically available in 3-pole and 4-pole versions.

• Trip Unit: Fixed thermal-magnetic trip unit. The thermal setting is adjustable within a range (e.g., 0.7-1 x In), and the magnetic instant trip is usually fixed or has a few selectable settings.

• Standards: Compliant with international standards such as IEC 60947-2.

Advantages and Core Features

The primary advantage of the ABB T3N225 is its combination of robust protection, compact size, and high breaking capacity. The Tmax XT series design offers improved performance in a smaller footprint compared to previous generations. It features a clear trip indicator and a reliable, maintenance-free mechanism. The breaker’s high interrupting rating ensures it can safely clear severe fault currents, protecting downstream equipment and personnel. The versatile T3N225 can be used as an isolating switch and is compatible with a wide range of ABB accessories like auxiliary contacts, shunt trips, and undervoltage releases, enhancing its functionality in automated systems.

Application Scenarios

This circuit breaker is widely used in the power distribution and protection sections of industrial automation:

• Motor Control Centers (MCCs): Serving as the main feeder breaker for a group of motors or as the individual disconnecting and protection device for large motors (e.g., 150 HP pumps, large fans).

• Industrial Control Panels: Protecting the main power supply inlet to a PLC cabinet, a variable frequency drive (VFD) bank, or a large UPS system.

• Power Distribution Boards: Acting as a sub-distribution breaker for a section of a factory floor or a process unit.

• HVAC Systems: Protecting large chiller or compressor motors in commercial and industrial buildings.

• Renewable Energy: Used as a protection device in solar inverters or wind turbine power distribution.

Comparison with Competing Products

The ABB T3N225 competes directly with similar frame-size MCCBs from Schneider Electric (Masterpact MTZ225), Siemens (3VL2225), and Eaton (NZM2-XS225). Its key advantages within the Tmax XT series often include a more compact design for its rating, a user-friendly front-face adjustment for the thermal setting, and a proven track record of reliability. Compared to smaller miniature circuit breakers (MCBs), the T3N225 offers significantly higher current ratings and breaking capacities, making it suitable for main feeder and heavy-load applications.

Selection Guide and Important Notes

Selecting the ABB T3N225 requires careful analysis of the electrical characteristics of the circuit it will protect.

Important Precautions:

• Load Current: The continuous load current must be less than or equal to the breaker’s rated current (225A), considering ambient temperature derating if necessary.

• Short-Circuit Current: The available fault current at the point of installation must not exceed the breaker’s ultimate breaking capacity (Icu). A protective device coordination study is recommended.

• Selectivity: To ensure selective tripping (only the breaker closest to a fault trips), its time-current curve must be coordinated with both upstream (main) and downstream (branch) protective devices.

• Accessories: Specify necessary accessories (e.g., auxiliary contact for PLC feedback, shunt trip for remote shutdown) at the time of purchase for integrated installation.

• Installation & Torque: Follow ABB’s installation instructions precisely, using the correct cable sizes and applying the specified torque to the terminal screws to prevent overheating.

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