FB3090 40C Calibrated Themral magnetic AB DEION molded case circuit breaker. 3 Pole 600V Circuit Breaker by Westinghouse Corp., but now owned by Eaton / Cutler-Hammer. FB breaker are still in demand for older buildings, factories, schools or hospitals. Shunts and other accessories are tricky to install and require an experienced tech. Breakers like these can continue in good use if not constantly overloaded and abused. FB3090 a Westinghouse product. Sold as Reconditioned/Green.