Phoenix Contact, VAL-MS 120 ST Surge Protector 120 V ac Maximum Voltage Rating 40kA Maximum Surge Current Surge

VALVETRAB® Pluggable single-pole modular lightning surge protector

The 2798844 from Phoenix Contact is a type 2 surge protection plug. This plug is designed to protect low voltage or three phase power supplies in your installations. It's backed with thermal monitoring, easy pluggable design that’s allow for simple maintenance, mechanical indicator that shows the status and a wiring bridge that allows multiple modules to easily connect and be bridged on the ground connection. VALVETRAB provides L-N and L-PEN protection.

Surge Protection Devices, SPDs (DIN-rail)

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.