EN54-3 Type A for standard bells and EN54-3 Type B for weatherproof versios. Klaxon Fire Bells. This fire bell from Klaxon has a universally recognised alarm sound and low current consumption making it ideal for many different alarm systems. It has a robust steel gong (6 in or 8 in) and a red steel dome. Features and Benefits. Low current consumption Universally recognisable sound Diode polarised Choice of gong sizes (6 in ; 8 in) Steel dome IP21C for standard bells, IP33C for weatherproof versions. Applications. A motorised bell designed for fire alarm applications.