Finder monitoring relays 71 series finder 711182301010 the over under voltage monitoring relay finder 711182301010 is rated at 230v 10a this single phase spdt co relay is for mounting onto 35mm din rail it detects and trips on out of limits l n voltage and protects against excessive startshour through power on and lock out time delaystypical applications protection of compressor motors and high pressure discharge lamp circuitry finder 711182301010 10a over under v