Marine Battery Disconnect Switch ON/OFF (Single Battery), 275 A Continuous / 600 A Peak, Compact 68×68 mm

This marine ON/OFF battery disconnect switch (also known as a master battery cutoff) is designed to provide a fast and secure way to isolate your battery from your electrical system. With a simple turn of the knob, you can completely cut off power – extremely useful for long periods of storage (to prevent unwanted battery drain) and for performing electrical work or installing new equipment safely with the power off.

Key characteristics and benefits:

• High Capacity in a Compact Size: Although the housing is only 68×68 mm, this switch is built to handle serious current. The 275 A continuous rating covers the demands of most boats and vehicles (e.g., powering winches, inverters, lighting circuits), and the 600 A peak rating (up to 1250 A for very short bursts) ensures the switch can comfortably withstand the surge of engine start or heavy load spikes without burning out or sticking.
• Multi-Voltage Application: This disconnect is truly universal – you can use it in 12 V systems (cars, small boats), 24 V systems (trucks, twin-battery setups on yachts), or even 36–48 V banks (special applications, solar battery banks). That versatility means it meets a wide range of global standards (for instance, it’s suitable for 32 V marine systems, common in many yacht electrical setups).
• Reliable Build: The reinforced polymer housing is weather-resistant – sealed against moisture ingress and UV-stabilized to prevent sun damage and cracking. The internal copper contacts are treated to resist corrosion and provide low resistance on every make/break cycle. The design is tested for over 10,000 switching cycles, ensuring a long service life under regular use.
• Safety and Protection: With this master switch, you can confidently leave your boat or vehicle unattended – in the “OFF” position it cuts off all parasitic draws (clocks, alarms, memory functions) that could slowly drain your battery. It also serves as a fire-prevention measure – disconnecting the battery greatly reduces the risk of short-circuits or electrical fires when the vessel is not in use. Many owners also employ it as an anti-theft device: if the switch is turned off (and perhaps hidden), a thief cannot easily start the engine because the electrical system is immobilized.
• Easy Installation & Use: The compact footprint allows installation even in tight spaces near the battery. The unit features four mounting holes for screws/bolts. The wiring terminals on the back are clearly labeled – two heavy-duty studs (one input from the battery positive and one output to the main feed). Simply connect your battery’s positive lead to one stud and the other stud to your electrical system’s positive supply line. Turn the knob to “ON” to connect power, or “OFF” to disconnect. The knob has a distinct click into each position, providing both visual and tactile confirmation of its status.

Whether you’re preparing your boat for winter lay-up or just want a secure way to reset your electrical system, this marine ON/OFF battery switch is invaluable. It’s compact, easy to integrate, and it greatly enhances safety and control over your power supply. By installing this cutoff switch, you protect your battery from unwanted discharge, guard against electrical accidents, and extend the life of both the battery and your electrical components. It’s a small addition that delivers big peace of mind.