Square D SDSA3650 Surge Protective Device SPD

Square D Surgelogic SDSA3650 Type 1 Surge Protective Device delivers robust three-phase surge protection for service entrances, rated at 50 kA per phase on a 600Y/347 VAC, 50/60 Hz system. This 3P4W SPD is designed for indoor or outdoor installation with a NEMA 1 enclosure (with variants offering NEMA 4X protection in the SDSA3650D delta family), and it supports protection across 208Y/120 V up to 600 V line-to-line services. Its Type 1 rating accommodates use with or without an overcurrent protection device, and it employs thermal-cutoff circuitry to isolate the device during severe surges. Common applications include service entrance panels and main distribution panels where reliable surge protection for three-phase equipment and sensitive electronics is required.