OutBack X-240 Auto Transformer OutBack X-240, 4 kVA 120/240 Auto Transformer 60 Hz includes two pole 25 amp OBAC breakerThe OutBack X-240 auto-transformer is used for step-up, step-down or for generator and split phase output balancing applications. Includes a 25 amp two pole breaker for manual control and overload protection of the transformer and wiring. Rated up to 4kVA at 25 C without the OutBack cooling fan kit. The X-FAN kit increases the power rating of the X-240 to a maximum of 6kVA continuous. 120 VAC powered.