SQUARE D SDSA3650 3 PHASE SURGE PROTECTION
The SDSA3650 Secondary Surge Arrester is designed and listed for indoor or outdoor installation and surge protection of three-phase grounded electrical services up to 600 Vac. and is used extensively in service entrance panels to provide an efficient and economical means of surge protection. The SDSA1175 and the SDSA3650 secondary surge arresters offer the following distinctive features: UL Listed as TVSS; UL and C-UL as secondary surge arrester (for SDSA3650 only) Meets ANSI/IEEE C62.11-1987 Suitable for use in Category B and C locations Metal oxide varistor (MOV) design LED indicates operational status Fast response time Maintenance-free, long life Housing The arrester housing is made of high temperature thermoplastic. The cover is permanently bonded to the housing by an ultrasonic welding process, and the wire exit is sealed using a potting compound. The arrester can be used for both indoor and outdoor applications. MOV Technology MOVs provide voltage surges with a low resistance path line-to-neutral while providing high resistance to the 50/60 Hz power source. Traditional gas tube arresters suffer from slow response time, high clamping voltages, and crowbarring effects (the reduction of voltages during conduction in order to short circuit the load). The MOV responds faster and has a lower clamping voltage because it does not have a gap structure. Fuse Links and Thermal Cut-offs Individual non-replaceable internal fuse links and thermal cut-offs protect the MOVs and open in the event of a varistor-damaging overload. Silica inside the arrester housing reduces the risk of one fuse damaging another when it opens. LED Indicator The LED on the face of the device indicates operational status of the arrester. If the light is on the device is fully operational. When the LED indicator goes off, the device should be replaced.