Perko Medium Duty Main Battery Disconnect Switch w/Key Lock

The Perko Medium Duty Main Battery Disconnect Switch w/Key Lock is the marine electrical component serious boaters rely on to protect their vessel's 12, 24, and 32-volt systems. After years on the water, you understand that battery isolation isn't optional—it's critical safety equipment. This ignition-protected switch provides a secure, keyed cutoff point between your main battery bank and electrical system, preventing parasitic drain, reducing fire risk, and allowing you to safely isolate power during storage, maintenance, or emergency situations.

Built to handle continuous loads of 250 amps with intermittent capacity reaching 360 amps, this medium-duty disconnect is engineered for fishing boats, cruisers, and working vessels that demand reliability under real operational stress. The key-lock design ensures only authorized personnel can power down your system, protecting against accidental disconnection or tampering. Ignition protection means the switch meets stringent marine safety standards, eliminating the spark hazard that can occur with standard battery cutoffs—a critical feature when fuel vapors are present in an engine compartment.

Whether you're rigging a new boat, upgrading aging electrical systems, or preparing for seasonal layup, this Perko disconnect switch integrates directly into your main battery positive feed. Its compact footprint (6 x 3 x 8 inches) fits standard panel installations, and the robust construction withstands salt air, vibration, and the thermal cycling typical of marine environments. From weekend anglers protecting overnight battery drain to commercial operators meeting insurance and Coast Guard compliance, this switch is the standard workhorse found aboard vessels that prioritize electrical safety and system longevity.