RS PRO Surge Suppressor Unit 253 V Maximum Voltage Rating 6.5kA Maximum Surge Current EMC Filter

Combined surge and RFI filter units

Includes EMI / RFI filter

Will not pass a 500V insulation test.

Need to protect your electronic equipment from harmful power surges? Use this EMC (electromagnetic compatibility) filter from RS PRO. It prevents devices from generating or being affected by any kind of electrical disturbance, such as lightning or a blown fuse. This type of part is often used with kitchen appliances, computer equipment and medical devices.


The filter has EMI (electromagnetic interference) protection to eliminate humming, buzzing and other unpleasant electrical noises. It's quick to install, as all you need to do is mount it onto a DIN rail. It's safe to use in a wide range of commercial settings, thanks to its operating temperature range of -25°C to +85°C. You'll often find this surge suppressor unit in domestic and commercial settings, including bedrooms, offices and IT labs.

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.