Perko 8521DP Dual Battery Selector Switch with Mounting Ring and Legs, Bulkhead Mount

Dual Battery Switch w/Mounting Ring Legs - Bulkhead Mount

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"

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

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"

Perko 8521DP Dual Battery Selector Switch provides reliable control for marine electrical systems using two or more batteries. Designed for bulkhead mounting, this battery switch lets you select Battery 1, Battery 2, both batteries in parallel, or the off position. The combined setting supports battery charging and starting flexibility, while the off position can function as an emergency main disconnect during an electrical problem.

The Perko 8521DP features a make-before-break design that helps prevent interruption when changing between battery selections. Its ignition-protected construction makes it suitable for marine applications with alternators and generators operating from 6 to 50 volts DC. The removable actuator key helps limit unauthorized operation and provides convenient control when the switch is not in use.

Built for dependable service, the switch includes a red polycarbonate polymer body, black polymer actuator key, and nickel-plated terminals. Its distinctive oval housing is designed to mount in a round opening, helping simplify installation while providing a clean bulkhead appearance. The switch is rated for 140 amps continuous, 200 amps for 5 minutes intermittently, and 250 amps for 30 seconds during engine starting.

Perko part number 8521DP is a practical choice for boats requiring selectable battery management, emergency disconnect capability, and durable performance in demanding marine electrical environments.

Features:

• Supports two or more batteries for selectable or combined operation
• Four switch positions: Off, both batteries on, Battery 1 on with Battery 2 off, or Battery 1 off with Battery 2 on
• Make-before-break design for smoother battery selection changes
• Ignition-protected for compatible marine electrical systems
• Rated for 140 amps continuous, 200 amps for 5 minutes intermittent, and 250 amps for 30 seconds during starting
• Compatible with alternators and generators operating from 6 to 50 volts DC
• Unique oval housing mounts in a round opening
• Removable actuator key helps control switch access
• Red polycarbonate polymer body with black polymer actuator key
• Nickel-plated terminals for durable electrical connections