Manual Thruster Switch - (Blue Sea 9003) - 350 Amps - For Thrusters with 325A or Lower Fuses

Required accessories for a complete thruster system. See our website for helpful system set-up diagrams which illustrate how these components are selected and used in a variety of applications; search under: SIP.
Main power switches should be mounted within 72 inches of the batteries

The SMBS9003EB 350A switch can be used on all thrusters that use a 325A, or lower, fuse.
• Ignition protected — safe for installation aboard gasoline powered boats
• Case design allows surface or rear panel mounting

The SMBS3000B heavy duty 600A switch is best suited for thrusters that use 400A and 500A fuses, but can be used with any thruster.
• Ignition protected — safe for installation aboard gasoline powered boats
• Case design allows surface or rear panel mounting
• Accepts two 4/0 AWG (95mm²) battery cables

The Side-Power website has helpful system set-up diagrams illustrating how components are selected and used in a variety of possible thruster installations.
When the webpage opens, select Side Power for the category, and select a "Type" of your choosing. "System Diagrams" will present you with a number of basic layouts for various thruster configurations - illustrating the parts you need for a complete system.
These diagrams also indicate where 5-wire cables are needed, and where 4-wire cables are used.

You might also find the "Type" named "Wiring Diagrams" helpful.
Regardless of the thruster system you are considering, the "Installation Manual" is an excellent reference. It illustrates many of the general factors and components needing consideration in any thruster installation, including placement of the tunnel, etc.