Littelfuse, Inc. Arc-Flash Monitoring AF0025-00

The AF0025 series arc-flash relay is a cost-effective and OEM-focused solution that provides innovative arc-flash protection in a compact package. The relay significantly reduces arc-fault damage in ac and dc compartments by detecting the light from an arc flash using one or two optical sensors, and rapidly providing a trip signal. The compact design means it can be surface or DIN-rail mounted into the smallest spaces possible, making it an ideal OEM solution for tight cabinets such as combiner boxes and inverters. The AF0025 is conformal coated to provide protection from environmental concerns. The use of one or two sensors makes it flexible for small or medium-size panels, with onboard or remote reset capability. There are no settings required, making it quick and easy to install without the need for a computer. The unit also includes a solid-state redundant trip circuit, providing an internal fail-safe mechanism and a very fast arc-flash response even during power up. One isolated changeover (Form C) output contact is provided to issue the trip signal to the interrupting device, which can be set to fail-safe or non-fail-safe operating modes. A second Form C contact is provided to signal an error condition such as a loss of communication to a sensor. Compact solution Two sensor inputs Fixed light sensitivity Internal fail-safe design Selectable fail-safe and non-fail-safe operation Error output