ENTES DIN Rail Multimeter and Output Relay, EPM-04x-DIN Series - ENTES EPM-04C-DIN, The ENTES EPM-04C-DIN is a DIN Rail Mounted Output Relay, that has been designed for measuring Phase Current, Frequency, Neutral Current and Voltages (Phase-Phase and Phase-Neutral) in a 3-Phase system. ENTES EPM-04C-DIN DIN Rail Digital Panel Meter