Features: The FHM3 125A Automatic Transfer switches ensures reliable power continuity by intelligently switching between mains and backups sources during outages, preventing disruptions for critical systems. Its 2P/ small design with high strength flame retardant housing simplifies installation while providing superior heat resistance and impact defense for electrical safety. designs for homeowners, small businesses, and industrial operators requiring fail safe power management in space constrained environment . Optimizes energy reliability in residential complexes, facilities, and servers room where uninterrupted electricity is not negotiable. auto restoring functionality automatically reverts to primary power after recovery, minimizing manual intervention for efficient circuit breaker operation. Specifications: Component : ABS plus PC Size: about 10.7x7.6x9.6cm/4x3x3.8inch Current: multiple for option Package Includes: 1xAutomatic Transfer switches note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.