Profile: Existalite,Thomas and Betts Ltd provides emergency lighting solutions to the lighting industry. We provide emergency lighting components, emergency luminaires, testing systems and static inverters & central battery systems. We specialize in the provision of low level & way guidance lighting solutions for marine, rail, petrochemical and land-based applications. The ZT range of inverter modules utilizes electronic circuitry compliant to the safety and performance requirements of EN 61347 and EN 60925. Each zinc galvanized steel module incorporates a constant current charge circuit with battery deep discharge protection. The highly efficient DC-AC inverter circuit is connected to the lamp circuit via a 4-pole changeover device and a delayed energy relay which disconnects the ballast live supply during testing ambient temperature range 0-50°C.