Featuring 4 Form C contacts, VGM-100 Battery Voltage and Ground Fault Monitor reads battery status, detects out-of-limit conditions, and provides alarm conditions at user settings. Real-time battery ground fault monitor, GFM-100, displays positive or negative ground fault message and can activate one of 4 Form C contacts. Upon detecting over/under voltage condition, VM-100 Battery String Voltage Monitor displays voltage over/under status and activates 4 Form C contacts.