Features EASY TO INSTALL: The surge protection device is compact in size, which saves the user's installation space and is easy to install and maintain. Smooth operation and superior performance. MAINTENANCE: The low voltage surge arrester device is set up with plug-in modules, which is easy to maintain, and the internal components are made of precision chips and copper columns, which are highly accurate and have good conductivity. HIGH QUALITY: The house surge protector is made of fireproof and high flame retardant materials, which is safe, reliable and durable. It eliminates the low-frequency humming sound when the contactor is working and creates an ultra-quiet environment. MAIN USES:This surge arrester unit can be used to protect power distribution equipment from overload and short circuit damage, as well as for control and isolation. Suitable for home, giving you more comfortable protection. CUSTOMER SERVICE: We want to bring you the best product experience. If you have any pre-sale or post-sale questions, please feel free to contact us. We are committed to bringing our customers the best shopping experience and will solve your problems in a timely manner. Specification:Condition: 100% Brand NewRated Current: 20ASetting Current: 40AMounting Method: Rail MountingRated Voltage: 385VNumber of Main Contacts 4pOptional Style: 4P40KA, 4P80KAWeight: Approx. 404g / 14.3oz Package List:1 * Surge Protective Device Package List