Project Description

AfterMarket Marine Parts fit for:
Factory No.:YS8521DP
OE No.: 8521DP
YS8521DP fit for Dual Battery Switch with Mounting Ring & Legs #8521DP
Dual Battery Switch w/Mounting Ring & Legs – Bulkhead Mount

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

Materials & Finish

Red polycarbonate polymer body
Black polymer actuator key
Nickel plated terminals


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

Technical Information

Rating: 140 Amps Continuous, 200 Amps 5 Min. Intermittent, 250 Amps 30 Second Start
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″