1High current battery isolator, 200 AMP battery isolator and relay to prevent the load on the auxiliary battery from draining the starting battery. 2Suitable for isolating the second battery, dedicated to protect battery life and prolong battery life. 3The voltage is automatically detected, and when the secondary battery is low, the charging function is turned on. 4With stable and excellent performance can be used to replace old or damaged relay module. 5Have humanized design, simple operation, easy to install, convenient to use and operate. Item Type: Dual Battery Isolator Relay Material: ABS and alloy Purpose: Smart isolator Input voltage: DC 12V Continuous Current: 200A Peak Current: 300A Contact Switching Current: 3A Contact Switching Voltage: DC 7.8V Contact Form: Normally open 1 xDual Battery Isolator RelayDo not use it outside the current and voltage range.