This automatic relay combines battery banks when the alternator charges and isolates them when discharging or engine-starting to protect sensitive electronics from voltage sags. Magnetic latching technology draws minimal current in stable states and moderate current only during switching transitions.

Dual-voltage sensing monitors both batteries independently for flexible management strategies. Optional start and engine-isolation modes protect against cranking draws and multi-engine conflicts on larger vessels. LED indicator shows bank status remotely without running dedicated signal wires. Tin-plated studs and silver alloy contacts ensure reliability through heavy switching cycles.

• 500 ampere continuous / 700 ampere intermittent capacity
• 12 volt operating voltage
• Magnetic latching (bi-stable) relay design
• Dual voltage sensing on both batteries
• Start and engine isolation configuration options
• Remote LED status output
• Surface or panel mount flexibility
• 5.47 x 3.75 x 2.03 inch dimensions