Phoenix Contact Surge Protector, 250V ac, DIN Rail Mount

Type 1 / Class I/B pluggable lightning surge protector designed to be placed on the main power supply in a low-voltage installation of a building protected by a lightning rod.
These pluggable arresters feature a high absorption capacity of 50 KA.
Unplugging the module does not require line cut-off.
Models FLT-CP-PLUS-…S... are designed for applications in which the ground (PE) and neutral (N) are separate, and FLT-CP-PLUS-…C..models are designed for applications in which the ground and neutral are common.
Mechanical display on each module.
Remote signalling contact for remote status display.
For mounting on DIN rail.
Screw connection.

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.