The ABB SACE Tmax XT series provides low-voltage circuit protection across XT1, XT2, XT3, XT4, XT5, XT6 and XT7 frame sizes, including the XT7 M motor-operated version. Rated currents span 1.6–1600 A, with breaking capacity up to 200 kA on applicable configurations. The series combines thermal-magnetic, magnetic-only and Ekip electronic protection with flexible installation options for industrial power distribution.
The ABB SACE Tmax XT Molded Case Circuit Breaker (MCCB) series is designed for low-voltage power distribution and equipment protection in industrial and commercial electrical systems. Covering current ratings from 16 A to 1,600 A across seven frame sizes, XT1 to XT7, the series offers flexible protection configurations and high short-circuit breaking performance. Featuring thermal-magnetic and electronic trip units, advanced Ekip protection technology and digital communication capabilities, Tmax XT circuit breakers provide reliable overload and short-circuit protection while supporting intelligent power distribution and system monitoring.
The Tmax XT series offers different trip unit configurations to accommodate power distribution and motor protection requirements. Thermal-magnetic trip units provide conventional overload and short-circuit protection, while Ekip electronic trip units offer adjustable protection settings and advanced monitoring functions. Depending on the selected version, protection functions include long-time, short-time, instantaneous and ground-fault protection, supporting improved protection coordination and electrical system reliability.
Designed for demanding electrical distribution applications, the Tmax XT series offers multiple breaking capacity levels to meet different short-circuit requirements. Available fixed, plug-in and withdrawable configurations support flexible integration into low-voltage switchboards. Three-pole and four-pole versions are available across selected frame sizes, with different connection arrangements and accessories to accommodate various installation designs.
Selected Tmax XT configurations feature Ekip electronic trip units with integrated measurement, monitoring and communication functions. Depending on the trip unit and installed modules, available functions include current and energy measurements, fault information, alarm management and remote monitoring. Communication interfaces support integration with industrial automation and energy management systems, helping operators improve electrical system visibility and maintenance efficiency.
The ABB SACE Tmax XT MCCB series is suitable for power distribution and equipment protection in industrial plants, commercial buildings, infrastructure projects and energy systems. Typical applications include main and branch circuit protection, motor feeder protection, generator circuits, distribution panels and electrical equipment requiring configurable overcurrent protection.
Frame Sizes: XT1, XT2, XT3, XT4, XT5, XT6 and XT7.
Rated Current: 16–1,600 A across the product family, depending on frame and standard.
Pole Configuration: 3P and 4P options, depending on model.
Trip Units: Thermal-magnetic and electronic Ekip trip units.
Protection Functions: Overload, short-circuit and selected ground-fault protection.
Installation: Fixed, plug-in and withdrawable versions, depending on frame.
Communication: Compatible Ekip communication and monitoring modules.
Standards: IEC 60947-2, UL 489 and CSA certifications for applicable product versions.
| Parameter | Specification |
| Product range | Tmax XT1, XT2, XT3, XT4, XT5, XT6, XT7 and XT7 M |
| Rated current | 1.6–1600 A across the range |
| Rated operating voltage | Up to 690 V AC |
| Breaking capacity | Up to 200 kA; classes N, S, H, L and V |
| Pole options | 3-pole and 4-pole |
| Protection types | Thermomagnetic TMD/TMA/TMG; magnetic-only MF/MA; Ekip Dip/Touch/Hi-Touch |
| Installation | Fixed, plug-in or withdrawable according to frame |
| Ambient temperature | −25 °C to +70 °C |
| Standard | IEC 60947-2; pollution degree 3 |
| Model | Rated Current In | Trip Unit Options | Mounting Versions |
| Tmax XT1 | 16 - 160A | Thermomagnetic, magnetic-only, Ekip electronic | Fixed, Plug-in |
| Tmax XT2 | 1.6 - 160A | Thermomagnetic, magnetic-only, Ekip electronic | Fixed, Plug-in |
| Tmax XT3 | 63 - 250A | Thermomagnetic, magnetic-only | Fixed, Plug-in |
| Tmax XT4 | 16 - 250A | Thermomagnetic, magnetic-only, Ekip electronic | Fixed, Plug-in, Withdrawable |
| Tmax XT5 | 320 - 630A | TMA/TMG, Ekip electronic | Fixed, Plug-in, Withdrawable |
| Tmax XT6 | 630 - 1000A | TMA, Ekip electronic | Fixed, Withdrawable |
| Tmax XT7 | 800 - 1600A | Ekip electronic | Fixed, withdrawable; manual operation |
| Tmax XT7 M | 800 - 1600A | Ekip electronic | Fixed, withdrawable; motor operation |
| Trip Unit | Main Function |
| TMD / TMA / TMG | Thermomagnetic protection for distribution and selected feeder applications. |
| MF / MA | Magnetic-only short-circuit protection, typically paired with separate motor overload protection. |
| Ekip Dip | Electronic protection with DIP-switch settings. |
| Ekip Touch | Electronic protection with measurement and interface functions. |
| Ekip Hi-Touch | Advanced electronic protection and diagnostics. |
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