The CBi Mini Rail Surge Protector QFL-1(13) is a single-pole surge protection device rated for 275V with a maximum discharge current of 40kA, designed to protect electrical circuits from transient overvoltages. It features LED indication of SPD status, a thermal disconnect device to prevent thermal runaway, and voltage-limiting MOV technology with zero series impedance. Ideal for use in residential and commercial installations, this Class II device must be backed up by a QA MCB and is constructed from copper and polycarbonate for durability and reliability.