UL listed heavy duty 40A manual AC transfer switchFeatures: Easy to drill enclosure case with switch pre-mounted. Alternative compact enclosure(110 x 80 x 86mm) available upon request if not to connect conduit. Water proof enclosure with pre-installed gaskets keep elements out.Easy installation – wiring instruction included.Additional faceplate with LINE-OFF- INVERTER imprint besides the default LINE-OFF-GEN.Handle 40A input/output on each connection terminal. Suitable to work with up to 9200 Watt generator.UL Listed to meet building code.1 year manufacturer warranty. Surface panel Size: 64x64x7mm / 2.5 x 2.5 x 0.287 In. Switch behind panel dimensions: 76x64x64 mm/ 3×2.5×2.5 In.