Battery Disconnects
A disconnect switch isolates your battery bank with one turn: it kills parasitic draws in storage, makes service safe, and gives you a fast shutoff in an emergency. This category spans the range, from Blue Sea Systems m-, e-, and ML-Series rotary switches rated 300 to 500 amps for big house banks and inverters, to Battery Doctor knob and top-post switches in the 100 to 125-amp range for a single battery.
9 products
Blue Sea Systems ML-Series Remote Battery Switch | 500A Continuous, 12V, Manual Override
Cummins Onan Starter Solenoid Relay | OEM Replacement for Emerald & Marquis Generators
Battery Doctor Mini Master Rotary Battery Disconnect Switch | 48V, On/Off Knob
Blue Sea Systems m-Series Mini Dual Circuit Plus Battery Switch | Red, 300A
E-Series Selector Battery Switch | 4-Position, 32V DC, 325A
Blue Sea Systems e-Series Battery Switch | Single Circuit On/Off, 48V DC, 350A
Blue Sea Systems 6007 m-Series Mini Selector Battery Switch | 4-Position, 300A, Red
Battery Doctor Water-Resistant Master Battery Disconnect Switch | 100A Continuous, 2 Keys
Battery Doctor Top-Post Battery Knob Switch with Fused Bypass | 125A, 12V
Picking the right disconnect switch
The right switch comes down to how much current your bank moves and how you want to mount it. Everything from a single house battery to a large inverter bank is covered here, so start with your amperage and work out from there.
- Amp rating. Match the switch to your bank's continuous load with headroom to spare. Blue Sea's m-, e-, and ML-Series run 300 to 500 amps continuous for larger banks and inverters, while Battery Doctor's 100 to 125-amp knob switches suit a single house or chassis battery.
- Mounting style. A top-post knob like the Battery Doctor threads straight onto the battery terminal with no panel cutting. Rotary switches such as the Blue Sea m-Series and e-Series bolt to a bulkhead and take cable lugs, the tidier look for a fixed install.
- Single vs. selector. A single-circuit on/off is all most rigs need. If you run two banks, a 4-position selector lets you choose battery one, two, both, or off from one dial.
- Remote and fused options. The ML-Series adds remote switching with a manual override, and Battery Doctor's fused-bypass top-post keeps a small charging circuit live while the main bank is switched off.
Wire the switch on the main lead close to your house batteries, and do not count on it for overcurrent protection, which is the job of your fuses and breakers. If the switch is there to stop storage drain, a charger or maintainer handles the other half of that problem.