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ABB Tmax XT series molded case circuit breakers: built to withstand harsh environments and safeguard marine and new energy applications.

ABB Tmax XT series molded case circuit breakers: built to withstand harsh environments and safeguard marine and new energy applications.

The ABB Tmax XT series represents a new generation of molded case circuit breakers (MCCBs) designed for modern power distribution and motor protection. Covering rated currents from 160A to 1600A, the series combines three core advantages: compact size, high breaking capacity, and intelligent capabilities. Built on a platform engineered for high performance, the entire series features integrated Ekip electronic trip units that support precise energy metering, thermal memory, and Bluetooth/NFC communication, enabling seamless integration with the ABB Ability™ cloud platform. Whether applied in low-voltage distribution, wind and solar power, marine and port operations, or industrial drive systems, the Tmax XT series delivers comprehensive protection solutions—ranging from cost-effective to high-performance options—thanks to its superior breaking capacity, flexible accessory system, and robust environmental adaptability, ensuring safe, continuous, and efficient system operation even under demanding conditions.
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Product Details

Product Family and General Specifications
This series includes various shells from XT1 to XT7, and their core features are compared below:
Model Frame current (A) Extreme number Rated operating voltage Ue (AC) Maximum splitting capacity (415V) Rated insulation voltage Ui (V) Rated impact withstand voltage Uimp (kV) Core positioning and application scenarios
XT1 160 3/4 690V 50kA 800V 8 Compact type: Standard power distribution protection suitable for residential and commercial buildings.
XT2 160 3/4 690V 150kA 800V 8 High-performance type: Breaking capacity up to 200kA, supports various electronic trip units, suitable for advanced power distribution and motor protection.
XT3 250 3/4 690V 36kA 800V 8 Reliability type: Selection of 250A-class industrial standard power distribution
XT4 250 3/4 690V / 750V DC 150kA 1000V 8 Enhanced version: Integrated with electricity metering function, suitable for applications requiring monitoring and communication.
XT5 400 3/4 690V 150kA —— —— Fill the demand between 160A and 400A
XT6 630/800 3/4 690V 70kA —— —— Suitable for high current distribution networks of 630A-800A
XT7 1000-1600 3/4 690V 150kA —— —— Maximum frame size, used for main power distribution below 1600A.

 

Dimensions

Tmax XT1 - Installation
Installation of Fixed Circuit Breakers
Tmax XT1 - Installation

 

Dimensions

Tmax XT2 - Installation
Installation of Fixed Circuit Breakers
Tmax XT2 - Installation

 

Dimensions

Tmax XT3 - Installation
Installation of Fixed Circuit Breakers
Tmax XT3 - Installation

Dimensions

Tmax XT4 - Installation
Installation of Fixed Circuit Breakers
Tmax XT4 - Installation

Dimensions

Tmax XT5 - Installation
Installation of Fixed Circuit Breakers
Tmax XT5 - Installation

Dimensions

Tmax XT6 - Installation
Installation of Fixed circuit breakers
Tmax XT6 - Installation

Dimensions

Tmax XT7- Installation
Installation of Fixed Circuit Breakers
Tmax XT7- Installation

Dimensions

Tmax XT7 M - Installation
Installation of Fixed Circuit Breakers
Tmax XT7 M - Installation

 

Detailed breaking capacity parameters for XT1 - XT7 (based on IEC 60947-2 standard)
Model Frame current (A) Division level code 415V AC ultimate breaking capacity Icu (kA) 690V AC ultimate breaking capacity Icu (kA) Remark
XT1 160 B 18 3 Standard power distribution for residential and commercial buildings
C 25 4
N 36 6
S 50 8
H 70 10
XT2 160 N 36 10 High-performance models with a maximum breaking capacity of 200kA; support for various electronic trip units.
S 50 12
H 70 15
L 120 18
In 150 20
XT3 250 N 36 5 250A Class Industrial Standard Power Distribution
S 50 6
XT4 160 / 250 N 36 10 250A flagship model with integrated power metering function
H 70 15
XT5 400 / 630 N 36 20 Filling the demand for 160A-400A
H 70 22
S 50 ——
XT6 630 / 800 H 70 25 Suitable for high current distribution of 630A-800A
S 50 30
H 70 42
XT7 1000-1600 S 50 30 The largest frame is used for main power distribution.
H 70 42

Trip Unit Types and Selection
Trip unit type Code Protection function Applicable models Features
Thermomagnetic TMD Overload long delay (L) + Short circuit instant (I) XT1-XT4 Adjustable thermal release, magnetic release for secure fastening
Thermomagnetic TMA Overload long delay (L) + Short circuit instant (I) XT1-XT5 Both thermal and magnetic tripping are adjustable.
Single magnet MF/MA Short circuit instantaneous protection XT2-XT4 Used for motor protection and contactor
Electronic Team I Short circuit instant (I) XT2/XT4 Single-stage protection
Electronic Team LS/I L + S + I three-stage protection XT2/XT4/XT5/XT6 Mode S provides selective protection.
Electronic LSI Team L + S + I three-stage protection XT2/XT4 Complete three-segment protection
Electronic Team LSIG L + S + I + G four-stage protection XT2/XT4 Includes ground fault protection
Electricity metering E-LSIG Team L+S+I+G + Electrical Energy Measurement XT4 Integrated power metering function
Motor protection Ekip MI Single magnetic protection XT2 Motor circuit short circuit protection
Motor protection Team M-LIU Overload + Short circuit + Phase imbalance XT2/XT4 Motor Comprehensive Protection
Motor protection M-LRIU Team Overload + stalled rotor + short circuit + phase imbalance XT2/XT4 Advanced motor protection
Generator protection Team G-LS/I Three-stage protection XT2/XT4 Designed specifically for generator characteristics
Neutral line protection Team N-LS/I Three-stage protection XT2/XT4 Suitable for high harmonic applications

Protection function descriptions:

●  L (Long): Overload long-time delay protection

●  S (Short): Short-circuit short-time delay protection (selective protection)

●  I (Instantaneous): Short-circuit instantaneous protection

●  G (Ground): Ground fault protection

Trip Unit Interchangeability

All models are available with either thermal-magnetic or electronic trip units, which are interchangeable. A solid green LED indicates normal operation, while a separate LED is dedicated to signaling abnormal protection conditions.

Installation and Operation Method
project Optional type
Installation method Fixed type, insertion type, pull-out type
Operation method Toggle handle, rotary handle, extended rotary handle, electric operating mechanism
Incoming line method Either top-in or bottom-in line is acceptable; no derating is required.
Installation location It can be installed horizontally, vertically, or flat, without the need for derating.

 

 

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