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Manual Battery Switches HD-Series
HD-Series Heavy Duty Selector Battery Switch with AFD
3003 Switches isolated battery banks to all loads or combines battery banks to all loads
- Includes AFD (Alternator Field Disconnect)
- Make-before-break contact design allows switching between battery banks without power interruption
- 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
Support
Frequently Asked Questions 
Installation
Mounting DiagramReference
Battery Management Wiring Schematics for Typical Applications
M-Series, E-Series, and HD-Series Battery Switch Operation DiagramsArticles
Using Blue Sea Systems' Battery Switch AFD Terminals to Indicate Switch PositionThe Benefit of Serrated Flange NutsMarketing Materials
Product Certificates
 11003 | Selector 3 Position |
 3000 | Single Circuit ON-OFF |
 3001 | Single Circuit ON-OFF |
 3002 | Selector 4 Position |
 3003 | Selector 4 Position |
Comparing
Frequently Asked Questions
Q: Do the battery switches switch the negative?
A:
In most cases no. The most common battery systems switch the positives and bus the negativesQ: Can I use battery protectant on my Blue Sea Systems Battery Switch and if so, what type?
A:
Yes, a marine grade protectant applied according to its instructions is acceptable.
