Tmax / Emax Breaker

ABB Tmax and Emax — Low-Voltage Circuit Breakers from Distribution to Main Protection

The ABB Tmax (MCCB, molded case circuit breaker) and Emax (ACB, air circuit breaker) series together form ABB's flagship low-voltage circuit breaker portfolio, covering protection requirements from 16A to 6300A. With over 1,000 product variants in this catalog grouping, these breakers serve as the backbone of power distribution in industrial plants, commercial buildings, data centers, and marine applications.

Tmax MCCB — Molded Case Circuit Breakers up to 1600A

• Tmax XT (XT1, XT2, XT3, XT4): Next-generation MCCBs up to 250A frame, featuring electronic trip units as standard. USB/Bluetooth connectivity for parameter setting and trip event analysis via ABB's Ekip Connect software.
• Tmax T (T4, T5, T6, T7): Industrial MCCBs covering 250A to 1600A frames, with thermal-magnetic and electronic trip unit options (PR221, PR222, PR223 series).

Key Tmax features:

• Breaking capacities from 18kA to 200kA at 415V AC
• Motor operator and rotary handle options for remote operation
• Comprehensive accessory range: shunt trips, undervoltage releases, auxiliary contacts
• IEC 60947-2 and UL 489 compliant (selected models)

Emax ACB — Air Circuit Breakers up to 6300A

• Emax 2 (E1.2, E2.2, E4.2, E6.2): Latest generation featuring Ekip trip unit platform with touchscreen display, integrated power metering, network analyzer functions, and communication protocols (Modbus RTU/TCP, PROFIBUS, PROFINET, IEC 61850, Ethernet/IP).
• Breaking capacities up to 150kA at 415V.
• Withdrawable and fixed versions with motorized racking.

Application Selection Guide

Procurement Notes

The ABB breaker ranges use structured order codes that encode the frame, breaking capacity, trip unit, and connection type. Standard configurations generally stocked; custom trip unit settings or communication modules may extend lead times to 6-12 weeks.