Monitoring relays from ABB, Siemens and Schneider Electric supervise phase sequence, phase loss, voltage, current, residual current and liquid level. The range includes CM and 3RS7 series, 3RQ4 and 3UG5 units and Harmony control relays, with measuring ranges up to about 10 A. Stoklink ships worldwide from Turkey and quotes project quantities on request.
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.
FAQ
What does a phase monitoring relay protect against?
It detects phase loss, wrong phase sequence and voltage outside the set window. Motors, pumps and compressors are protected from running on a faulty supply.
Is a monitoring relay the same as an overload relay?
No. An overload relay protects a motor from thermal overload. A monitoring relay supervises the supply or process, and often works together with the overload device.
Can I order monitoring relays for export projects?
Stoklink ships worldwide from Turkey, EXW. Lead time depends on distributor stock, and project quantities are quoted on request.
