Phoenix Contact, NEF 1- 3 Surge Arrester 240 V ac Maximum Voltage Rating EMC Filter

The Phoenix Contact SFP-TRAB series of EMC Filters have a combined protective circuit for absorbing transient surge voltages and high frequency interference voltages. This highly reliable series also features thermal monitoring of the protective circuit and disconnection status signal.

Voltage surges, often referred to as spikes or transients are typically caused by switching of fluorescent lights, fuses blowing or nearby lightning activity. The worst voltage spikes are usually caused by lightning strikes and can reach up to 6000V, with current surges of over 3000A. The maximum size of the let-through voltage and current inrush depends on the location within the building's wiring system. BS7671: 2011 Amendment 1 Sections 443 and 534 cover risk assessment and provides guidance on protection of electronic equipment for installation engineers to follow. The fullest information on lightning and surge protection comes from the BSEN 62305 series of standards.