Thomas & Betts GFB250 Miniature Circuit Breaker

Thomas & Betts GFB250 is a 2-pole miniature circuit breaker in the GFB series that provides overload and short-circuit protection for single-phase branch circuits in commercial and industrial low-voltage distribution. It is rated 50 A at 120/240 VAC and has a 10 kA interrupting capacity at 240 VAC, with a thermal-magnetic trip unit offering long-time and instantaneous protection. The plug-in design accepts plug-in bus connections for quick installation into compatible panelboards and load centers, making it suitable for panelboards, lighting circuits, HVAC equipment, industrial control panels, and general-purpose electrical distribution. The device operates at up to 40°C and is intended for use where dependable thermal-magnetic protection is required. Note: the GFB250 is discontinued/obsolete; common replacements include the GFB230, GFB260, and GFB270. In practice, system integrators along with maintenance electricians, facility managers, and OEMs deploy this MCB for new installations, preventive maintenance, equipment upgrades, and replacement of existing GFB-series breakers.