Catalog » Battery Switches » Dual Battery Selector Switch [8521]

Dual Battery Selector Switch - [8521]


The Perko Dual Battery Selector Switch allows the addition of an extra battery for accessories. This switch provides the flexibility of selection between batteries or combined operation of both batteries in parallel for starting or charging. It can also serve as an emergency main disconnect switch in the event of an electrical problem. All models are make before break design and are ignition protected.

Four switch positions: Both "Off", Both "On", Battery 1 "On"/Battery 2 "Off", Battery 1 "Off"/Battery 2 "On"

Three mounting options
Panel mount with backing plate
- Face plate flush mounts on surface.
Bulkhead mount with mounting legs - Allows for direct cable access.
Cup mount - Attractive, durable easy open/close cover that hides and protects switch face.

Materials & Finish

  • Red polycarbonate polymer body
  • Black polymer actuator key
  • Nickel plated terminals

  • Features
  • For two or more batteries
  • Unique oval shape mounts in a round hole
  • Removable actuator key

Ordering Info

Description Dealer Pkg 5 Pcs. 1 Pc. per Pkg. OEM Bulk Pkg. 25 Pcs.
Switch with Mounting Rings & Legs
Switch Only with Ring
Switch Only with Legs
Switch Only with Cup Mount

Tech Info

  • Rating: 140 Amps Continuous, 200 Amps 5 Min. Intermittent, 250 Amps 30 Second Start
  • Panel Mount Installation Hole Size: 3"
  • Cup Mount Installation Hole Size: 4"
  • Cup Diameter Size: 4-1/2"
  • For use with alternators and generators 6-50 V.D.C. Marine Electrical Systems
  • Ignition Protected
  • Face Dimensions: 3-7/8" x 3-1/4"

Spare Parts Info

Spare Actuator Key: 8521DP0KEY

Product Certifications


Additional Images