Perko 250 Amp Battery Selector Switch with Alternator Field Disconnect

Perko 8503 Medium Duty Battery Selector Switch with Alternator Field Disconnect

The Perko 8503 Battery Selector Switch lets you select individual batteries or combine them for engine starting, accessory power, and charging. Designed for 6–32 VDC marine electrical systems, it features an alternator field disconnect that interrupts field current on non-unitized alternators, helping reduce the possibility of damage if the switch is accidentally turned OFF while the engine is running.

Features

• Make-before-break operation allows switching between 1, ALL, and 2 while the engine is running.
• Ignition-protected design permits installation in gasoline-powered boat engine compartments.
• Polycarbonate body with brass terminals and an easy-to-turn selector knob.
• Surface-mount design uses Perko’s traditional mounting bolt circle.
• Made in the USA.

Specifications

• Continuous capacity: 250 amps
• Intermittent capacity: 360 amps for 5 minutes
• Diameter: 5-1/4 inches
• Depth: 2-5/8 inches
• Terminal stud size: 5/16 inch

Installation Note: Alternator field disconnect protection applies to compatible non-unitized alternators. Follow Perko’s installation instructions for proper wiring.

View Perko 8503 Battery Selector Switch Installation Instructions (PDF)

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