Perko Battery Switch, 6-32V, Ignition Protected, Surface Mount

Overview

This Perko battery switch range is a group of marine battery control switches for connecting, isolating, and selecting onboard battery banks. Depending on the selected model, the range covers compact medium duty selector switches, a heavy duty selector switch with alternator field disconnect, and a medium duty main battery disconnect switch with key lock security.

These switches are built for 6 to 32 VDC marine electrical systems and use polycarbonate bodies with brass terminals. Ratings vary by configuration, with compact selector models rated at 315 amps continuous and 450 amps for 5 minutes, the heavy duty selector rated at 380 amps continuous and 850 amps for 5 minutes, and the medium duty disconnect rated at 250 amps continuous and 360 amps for 5 minutes.

They suit surface-mounted installations where battery control needs to stay accessible at the helm, near the engine space, or close to the battery compartment. Ignition protected construction supports installation in gasoline engine rooms when the rest of the electrical installation is arranged correctly for the boat.

Key features

• Works with 6 to 32 VDC marine electrical systems, covering common 12V and 24V vessel setups.
• Ignition protected construction supports use in gasoline engine room locations.
• Polycarbonate body with brass terminals for a housing and connection layout suited to marine electrical service.
• Selector switch versions allow battery bank selection for starting, house loads, charging, or emergency parallel use.
• Compact selector versions are rated at 315 amps continuous and 450 amps for 5 minutes, with 3/8 inch terminal studs.
• The heavy duty selector version is rated at 380 amps continuous and 850 amps for 5 minutes, with 1/2 inch terminal studs and alternator field disconnect.
• The medium duty disconnect with key lock is rated at 250 amps continuous and 360 amps for 5 minutes, with 5/16 inch terminal studs.
• The make-before-break function on selector versions allows movement between 1, ALL, and 2 positions while the engine is running.
• Surface-mount format gives installers flexibility when replacing an older switch or setting up a new battery control location.

Variants

This product is offered in several Perko battery switch configurations. The variants differ by part number, catalog length option, switch duty level, selector or disconnect function, and the presence of key lock or alternator field disconnect features.

The compact selector versions share a 4 inch by 4 inch by 3 inch body size, 315 amp continuous rating, 450 amp 5-minute intermittent rating, and 3/8 inch terminal studs. The heavy duty selector and the medium duty disconnect use different ratings and terminal stud sizes, so the selected variant should match the vessel load, cable size, and battery control layout.

• 8511DP, Length 3-Inch: Compact medium duty battery selector switch without key lock. This version suits dual-battery selection where a smaller footprint and four-position selector control are needed.
• 8512DP, Length 2-1/4-Inch: Compact medium duty battery selector switch with key lock. The key lock adds control over switch access where unauthorized operation is a concern.
• 8603DP, Length 1-3/4-Inch: Heavy duty battery selector switch with alternator field disconnect. This version fits higher-current installations that need battery selection plus added protection for non-unitized alternators if the switch is turned off while the engine is running.
• 9602DP, Length 2-Inch: Medium duty main battery disconnect switch with key lock. This option is for simple on-off battery isolation rather than selecting between battery banks.

Installation and system fit

Use the selected switch within its amp rating and match the terminal stud size to the battery cable ends and the expected current load. The compact selector models use 3/8 inch terminal studs, the heavy duty selector uses 1/2 inch terminal studs, and the medium duty disconnect uses 5/16 inch terminal studs.

Selector versions are useful where the boat carries more than one battery bank and the operator needs to run on battery 1, battery 2, or both. The disconnect version is better suited to installations where the goal is a lockable main battery shutoff rather than battery bank selection.

Use cases on board

These switches are a practical fit for cruisers, fishing boats, and small commercial vessels that need clear manual control over battery power. They can help isolate the electrical system during storage, manage starting and house loads, or combine batteries for emergency starting when the selected switch supports that function.

Maintenance and care

Battery switch terminals should be kept clean, tight, and protected from corrosion as part of normal onboard electrical maintenance. After installation, check cable routing so heavy battery cables are supported and not pulling against the switch terminals during vibration, trailering, or rough-water operation.