Chalmit G7636-4240 electronic emergency ballast, 220–254 V 50/60 Hz, 90-minute emergency duration for 2 × 36 W fluorescent lamps. Replacement spare for the Chalmit Protecta and Acclaim ranges of hazardous-area luminaires. Related variants: G7636-1240 (3-hour duration) and G7636-5240 (90 minutes).