These are solid state with programmable low voltage disconnects made to protect your battery from over discharge. There are 10 sets of Disconnect Voltage & Reconnect Voltage for selection .
10 selections of Low Voltage Disconnect and Low Voltage Reconnect
All Solid State with Micro-processor Control
Extensive Protections: Over Temperature, Over Voltage / Over Current.
Manual over-ride connection
Extruded Aluminum housing with PC plastic end caps
Minus 40°C to +60°C operation temperature.
SSB-4112/4212 User Manual