The Blue Sea Systems e-Series On Off Battery Switch (Model: 9003E-BSS) is a top - notch choice for your battery switching needs. It has a 350 - Amp continuous rating suitable for inboard gasoline or diesel engines. The tin - plated copper studs offer excellent conductivity and resist corrosion well. It can accept up to 4/0 AWG battery cables and 3/8' (M10) ring terminals. With a 7/8' (22mm) stud length, it can handle multiple cable terminals. The one - piece terminal stud design ensures it won't loosen over time. It fits most Perko and Guest low - amperage battery switch hole patterns. You can mount it on the surface or rear panel. The tactile indicator helps you feel the knob position. It's waterproof (rated IP66 against powerful water jets) and ignition - protected, safe for gasoline - powered boats. The make - before - break contact design allows seamless switching without power interruption. It switches a single battery to a single load group. Specifications include a single - circuit ON - OFF switch type, red color, 2 switch positions, no battery combine or alternator field disconnect, a maximum voltage of 48V DC, a terminal stud torque of 140 in - lb (15.82 Nm), a continuous rating of 350A, an intermittent rating of 600A for 5 minutes, a 30 - sec cranking rating of 1200A per circuit, 1 battery input, 1.10in (27.94 mm) cable clearance for 4/0 AWG cables, 4/0 AWG (120mm) cable size to meet ratings, mounting holes for 1/4' (M6) screws, tinned copper stud material, and 3/8' - 16 (M10) terminal stud size.
Using the Blue Sea E - Series Battery Switch is quite simple. First, make sure the power is off before installation. Connect the 4/0 AWG battery cables to the terminals as described in the specifications. The switch can be mounted on the surface or rear panel, just choose the most convenient option for your setup. When you want to turn on the power, simply turn the knob to the 'On' position. You can feel the position through the tactile indicator. When you're done, turn it to the 'Off' position. For safety, since it's ignition - protected, it's suitable for gasoline - powered boats, but always follow all local safety regulations. As for maintenance, check the terminal studs regularly to ensure they're tight. Since the studs are tin - plated copper, they resist corrosion well, but in a marine environment, it's still a good idea to inspect them from time to time. If you notice any signs of corrosion, clean the terminals gently with a suitable electrical contact cleaner. Also, make sure the switch is dry as it's waterproof against powerful water jets, but excessive moisture can still cause problems over time.
