Monitoring Relays (Phase, Voltage, Current, Level)

What's in this range

• Three-phase monitoring relays for phase sequence, phase loss and under or overvoltage, such as the ABB CM-PVS and CM-PVE types.
• Single-phase voltage and current monitors, including ABB CM single-phase monitors and Harmony voltage control relays.
• Level monitoring relays, for example conductive fill-level units with a resistance setting range.
• Residual current monitor relays for earth-leakage supervision.
• Siemens SIRIUS monitoring relays in the 3UG5, 3RS7 and 3RR2 series.

How to choose

• Monitored quantity: phase, voltage, current, residual current or level.
• Measuring range and set window: choose a range where your nominal value sits mid-scale.
• Supply voltage: 24-240 V AC/DC universal supply units cover most panels.
• Output contacts: one or two C/O contacts, and the switched current at 250 V.
• Delay and hysteresis: adjustable trip delay avoids nuisance trips on short dips.