Digital module over/undervoltage protection ANSI 27/29. Monitoring of voltages V12, V23, V31 or V1N, V2N, V3N on the Micrologic X. The circuit breaker trips when the preset voltage values are exceeded or undercut. For 27-1 and 59-1 when one of the three monitored voltages is affected. For 27-2 and 59-2 when all three voltages are affected. Micrologic X requires firmware version V002.000.xxx or higher. Earlier firmware is not compatible with this application. The Micrologic X requires connection to an external 24 Vdc supply for the over/under voltage protection function.