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T7H1250A

The ABB T7H1250A is a Thermal-Magnetic Molded Case Circuit Breaker (MCCB) from ABB's Tmax XT series (previously known as the T7 series). It is a high-current, three-pole circuit breaker designed for main feeder and branch circuit protection in industrial, commercial, and utility low-voltage distribution systems. This is a fixed-thermal magnetic version, meaning its protection characteristics are determined by fixed, factory-set internal mechanisms.

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Technical Parameters Parameter Description / Value Product Series / Family Tmax XT (formerly T7 Series) Breaker Type Molded Case Circuit Breaker (MCCB), Fixed Version Frame Size 1250A Rated Current (In) 1250 A (This is the maximum rating for this frame. Actual trip point is defined by the thermal-magnetic characteristic curve). Rated Operational Voltage (Ue) Up to 690 V AC Poles 3 Poles (3P) Breaking Capacity Category High (H) Ultimate Breaking Capacity (Icu) Typically 100 kA @ 415V AC (Example. Must be verified against official tables for exact voltage dependencies). Service Breaking Capacity (Ics) Typically 75% of Icu for High (H) category (e.g., 75 kA @ 415V). Trip Unit Type Fixed Thermal-Magnetic (A). Protection Functions Thermal (L) - Fixed overload protection (bimetal). Magnetic (I) - Fixed short-circuit protection (solenoid). Standard IEC 60947-2 Electrical Durability Typically 5,000 - 8,000 cycles (at rated current). Common Accessories Auxiliary contacts (OF/SD), shunt trip, undervoltage release, rotary handles, padlock kits. (Not included with base "A" version)