Comparison of SPD (TVSS) and SA 2025-11-27 11:58:07 Comparison of SPD (TVSS) and SA SPD (TVSS) SA (Surge Arrestor) Basic functions Protect electrical appliances by suppressing surge voltage Function implementation Mainly for line-to-line surge voltage suppression Line-to-line insulation protection of equipment Mainly suppressing surge voltage between line and ground Earth-to-ground insulation protection of equipment Development background (period) After generalization of electrically sensitive equipment Generalization of electrically sensitive equipment Object of protection Protect electronic equipment such as computers and PLCs from circuit breaker switching surges Protection of linear loads such as transformers and motors from circuit breaker switching surges Installation location (UL 1449) Circuit breaker secondary side (load side) Circuit breaker primary side (power side) characteristic - Low surge protection level (VPL) to suit electronic equipment insulation - Long life expectancy - Even if damaged, there is less fragmentation. - Noise can be removed using a filter. - High surge limit voltage, suitable for general electrical appliance insulation (BIL) - Short life expectancy - When damaged, a lot of debris is scattered. - Noise cannot be removed. Applicable standards IEEE C62.41 C62.11 NEC Article 285 Article 280 BIL Basic Impulse Insulation Level IEEE C62.11-1999 IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits (< 1 kV). IEEE C62.41-1991 IEEE Recommended Practice on Surge Voltages in Low-Voltage AC Power Circuits NEC Article 280 Surge Arresters NEC Article 285 Transient Voltage Surge Suppressors, New in 2002 Edition SPD Surge Protective Device, Surge suppressor, term used by IEC, IEEE NEMA National Electrical Manufacturers Association, a union of electrical manufacturers, uses SPD and TVSS interchangeably LIST 이전글SBB (Surge Black Box) developed by Surgefree2025.11.27 다음글Fire alarm experts stress importance of surge suppression2025.11.27
