Current Monitoring Relay WTKA1-01
WTKA1-01 Current Monitoring Relay.
Monitoring Relay
Monitoring relays for voltage, current, and phase supervision to keep electrical systems stable.
Monitoring Relay products
Current Monitoring Relay WTKA1-03
WTKA1-03 Current Monitoring Relay.
3 Phase Voltage Relay WTXU-03
WTXU-03 3 Phase Voltage Relay.
3 Phase Voltage Relay WTXU-05
WTXU-05 3 Phase Voltage Relay.
3 Phase Voltage Relay WTXU-07
3 Phase Voltage Relay WTXU-07.
What Fault Are You Trying to Catch?
Tell us whether it is phase loss, voltage drift or a load fault. We reply within 24 hours with the model, setting range and wiring diagram.
MONITORING RELAYS
Voltage and Current Monitoring Relays for Pump and Motor Panels
A monitoring relay is the part of a panel that notices the supply is wrong before the motor does. The WTXU range watches three-phase voltage for phase loss, phase sequence, over-voltage and under-voltage, with eight ranges set on a front knob and accuracy better than one percent.
Phase loss is the common case: a blown fuse or a loose terminal leaves one phase missing, and a three-phase motor keeps running on two until it overheats. The relay drops out and the contactor opens instead.
The WTKA1 range monitors current rather than voltage, for pumps that run dry, conveyors that jam and heaters that lose an element. Both families run on AC or DC 24 to 240 V and give an SPDT output. Units carry CE and CCC marking.
Choosing the Right Relay
Decide what has to be detected first: a supply fault or a load fault. Then set the range on site with the front knob.| Model | Detects | Supply | Output |
|---|---|---|---|
| WTXU-03 | 3-phase voltage, 8 ranges | From the measured supply | Relay contact |
| WTXU-05 | 3-phase voltage, 8 ranges | From the measured supply | Relay contact |
| WTXU-07 | 3-phase voltage, 8 ranges | From the measured supply | Relay contact |
| WTKA1-01 | Current, under or over | AC/DC 24–240 V | SPDT |
| WTKA1-03 | Current, under or over | AC/DC 24–240 V | SPDT |
Setting notes
- Don’t set the voltage window too tight. A relay set at plus or minus five percent will trip on normal supply variation every week, and someone will bypass it.
- Add a delay for short dips. A 0.5 to 2 second delay rides through contactor chatter without missing a real fault.
- Wire the output in series with the contactor coil, so a fault drops the contactor rather than only lighting a lamp.
COMMON QUESTIONS
Frequently Asked Questions
Phase loss, phase reversal, under-voltage from a heavy start elsewhere on the supply, or over-voltage from a generator or a disconnected neutral. If it trips often, check the setting window first, then the supply.
A three-phase relay watches all three phases and detects loss of one, reversal of sequence and imbalance. A single-phase relay only watches one voltage, so it cannot see a missing phase.
Select the system voltage with the front knob, then set the trip point with the adjustment. Measure the actual supply first and set the window wide enough to ride through normal variation.
One relay watches one supply point. If several pumps share a board and the supply is common, one relay can drop all contactors; if each pump has its own supply, each needs its own relay.
It is the relay function that opens the control circuit when one phase is lost, so a three-phase motor does not keep running on two phases and burn out. It is the most common reason a monitoring relay is fitted.
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