Master On/Off Switch
Brand: Blue Sea Systems
Product Description:
- Single circuit on/off switch
- Continuous rating: 300A
- Voltage range: 12-48V
- Colors: Red or black
Purpose:
- Disconnects batteries when performing routine maintenance
- Turns off electrical system for long-term storage
Watch Our Video Review
Below, we review the Blue Sea Systems battery switch (6006). We detail all the features and show you how to connect this switch to electrical wire. Enjoy!
Frequently Bought Together
There are two 3/8″ terminal posts under the switch, so you’ll need 3/8″ copper lugs to connect the switch to electrical wire. Refer to the below photo to see how this works.

Below are the most commonly used components when installing this master switch.
- 3/8″ Copper Lug – Crimps onto the 2/0 AWG wire and attaches to the switch.
- 2/0 AWG Wire – This wire connects the switch to the batteries and to the bus bars.
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Where To Install The Master Switch
This master on/off switch is installed between the 300A fuse and the positive bus bar (red). To make the connection, use 2/0 AWG wire and 3/8″ copper lug terminals. Refer to the wiring diagram below to visualize where the switch is installed.

Need More Wiring Information? Download our Electrical Wiring eBook.
Technical Details
Switch Positions | 2 |
Current Rating | 900A Cranking (30 sec)/ 500A Intermittent (5 min)/ 300A Continuous |
Max Voltage | 48V DC |
Terminal Stud Diameter | 3/8" (M10) |
Standards Met | IP66 waterproof, ISO 8846 and meets ABYC requirements. |