ABB SACE Tmax XT2S 125 – Reliable Overload & Short-Circuit Protection for LV Switchgear

The ABB SACE Tmax XT2S 125 is a compact molded case circuit breaker (MCCB) from ABB’s SACE Tmax XT series, designed for low-voltage power distribution and motor protection in industrial and commercial applications. With a rated current of 125 A and short-circuit breaking capacity up to 36 kA at 415 V, it delivers reliable thermal-magnetic protection while occupying minimal panel space—just three modules wide on a DIN rail.

Engineered for durability and ease of integration, the ABB SACE Tmax XT2S 125 combines high performance with serviceability, featuring tool-free access to terminals, optional auxiliary contacts, and compatibility with ABB’s digital monitoring accessories for predictive maintenance

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Application Scenarios

At a food processing plant in Germany, frequent nuisance tripping plagued older thermal breakers on refrigeration compressors—causing production delays and spoilage risks. After upgrading to the ABB SACE Tmax XT2S 125. engineers achieved stable motor protection even during high-inrush startups, thanks to its precise thermal-magnetic trip curve and Class 3 current-limiting capability. The compact size allowed retrofitting into existing panels without redesign, while the optional alarm contact enabled remote monitoring via the plant’s SCADA system. Today, the facility reports zero unplanned compressor shutdowns over 18 months—proving that the ABB SACE Tmax XT2S 125 isn’t just a protective device, but a productivity enabler.

Technical Principles and Innovative Values

Innovation Point 1: Class 3 Current Limitation – The ABB SACE Tmax XT2S 125 limits fault energy by interrupting short circuits in less than half a cycle, reducing stress on downstream components and enhancing system coordination—critical in modern compact switchgear.

Innovation Point 2: Tool-Free Terminal Access – Screw terminals are accessible without removing the front cover, speeding up wiring during panel assembly or field modifications—saving up to 30% installation time versus conventional MCCBs.

Innovation Point 3: Modular Expandability – Auxiliary, alarm, and shunt trip accessories snap on without tools, enabling easy integration into automation systems for remote status feedback or emergency shutdown.

Innovation Point 4: Optimized Thermal Stability – Advanced bimetal calibration ensures consistent tripping across ambient temperatures from -25°C to +70°C, eliminating drift in harsh environments like foundries or cold-storage facilities.

Application Cases and Industry Value

A renewable energy integrator in Spain deployed the ABB SACE Tmax XT2S 125 as feeder protection in solar inverter combiner boxes across multiple utility-scale PV plants. The breaker’s compact footprint allowed higher density per enclosure, while its 36 kA breaking capacity ensured safety despite long cable runs increasing prospective fault levels. After two years of desert operation—with daytime temperatures exceeding 50°C—the units showed no degradation in performance. Maintenance crews praised the clear ON/OFF indicator and easy reset mechanism, which reduced troubleshooting time during routine inspections.

In another case, an automotive stamping line in Michigan replaced legacy breakers with ABB SACE Tmax XT2S 125 units on hydraulic press motor circuits. The improved magnetic trip tolerance eliminated false trips during mechanical jams, while the optional auxiliary contact provided real-time status to the Rockwell PLC—enabling automated diagnostics and reducing mean time to repair by 65%.

Installation, Maintenance, and Full-Cycle Support

Installation of the ABB SACE Tmax XT2S 125 is straightforward: mount directly on a TS35 DIN rail or use fixed brackets for high-vibration environments. Torque specifications for line/load terminals are clearly marked on the housing, and the transparent cover allows visual confirmation of contact position without opening the panel. For motor circuits, pairing with ABB’s built-in magnetic trip adjustment (if applicable) ensures optimal coordination with contactors and overload relays.

Maintenance is minimal—no periodic calibration is required for thermal-magnetic units. However, after a high-level short-circuit event, internal inspection is recommended. The modular design allows quick replacement of the entire unit without rewiring, especially when used with plug-in adapters (optional). Our technical support team provides application engineering assistance, including short-circuit calculations, coordination studies, and accessory selection guidance. Every ABB SACE Tmax XT2S 125 we supply is factory-tested and backed by a 24-month warranty, with full traceability to ABB manufacturing lots.

Contact us for a customized solution—whether you’re designing a new control panel, modernizing aging switchgear, or securing spare parts for critical infrastructure, the ABB SACE Tmax XT2S 125 delivers trusted protection where every ampere counts.