WXU-03 Phase Failure and Phase Sequence Relay
WXU-03 phase failure and phase sequence relay for three phase three wire supplies, fixed settings, one 10A changeover contact in an 18mm module.
Time Relay
Time delay relays for sequential control, delayed start/stop, and timed switching in automation panels.
Time Relay products
WXU-04 Over and Under Voltage Relay 3 Phase
WXU-04 over and under voltage relay, three phase three wire, eight voltage steps 220V to 460V, threshold dials 2% to 20%, delay 0.1 to 10 seconds.
WXU-05 Phase Sequence Relay with Voltage Window
WXU-05 phase sequence relay for motor circuits, sequence and phase loss check, Un 220V to 460V in eight steps, 0.1 to 10 second delay.
WXU-06 Voltage Monitoring Relay with Asymmetry
WXU-06 voltage monitoring relay with a 5% to 15% phase asymmetry threshold, Un 220V to 460V in eight steps, threshold dials 2% to 20%, 18mm module.
WXU-07 Phase Asymmetry Relay with Delay
WXU-07 phase asymmetry relay with a 5% to 15% unbalance threshold and a 0.1 to 10 second delay, one 10A changeover contact in an 18mm DIN module.
WTS1 Loop Delay Relay AC/DC 12-240V
WTS1 Loop Delay Relay, 0.1 second to 10 day delay range, AC/DC 12-240V supply, knob setting and one 16A delay changeover contact in an 18mm module.
JR28 Thermal Overload Relay
JR28 Thermal Overload Relay, D13 to D33 frames, 7.2x trip in 2 to 10 seconds, phase failure protection and 1NO+1NC auxiliary contacts.
Multifunction Time Relay WTM1
WTM1 multifunction time relay with ten functions A to J, 0.1 second to 10 day range, AC/DC 12-240V supply and one 16A delay contact in an 18mm module.
Single Function Time Relay WTT8-B1
WTT8-B1 single function time relay, delay OFF type, 0.1 second to 10 day range set on the face, AC/DC 12-240V supply and one 16A SPDT changeover contact.
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Send what has to happen and when, plus the control voltage. We reply within 24 hours with the model, the time range and the terminal diagram.
TIME RELAYS
Time Relays for Delay, Cycling and Pump Alternation
A time relay is a contact that closes late. The coil is energised, a timer counts, and only then does the contact change state. That delay is what lets a panel start a second pump after the first has proved pressure, or hold a compressor off until the refrigerant pressure has equalised.
The WTT8-B1 gives one delay function, the WTT8-S1 cycles with separate on and off times, the WTM1 is multifunction with the mode selected on the front, and the WTA1 delays the start after power is applied. All four take AC or DC 12 to 240 V and switch 16 A at 250 V AC.
Delay ranges cover fractions of a second up to hours, set on the front dial. Units carry CE and CCC marking.
Time Relay Functions
Choose the function before the range. Most panels need one of four: a start delay, a cycling duty, a sequence step, or a power-on hold-off.| Model | Function | Supply | Where it is used |
|---|---|---|---|
| WTT8-B1 | Single delay | AC/DC 12–240 V | Fan run-on, valve stroke |
| WTT8-S1 | Asymmetric cycler | AC/DC 12–240 V | Pump alternation, dosing |
| WTM1 | Multifunction | AC/DC 12–240 V | Sequence steps |
| WTA1 | Power-on delay | AC/DC 12–240 V | Compressor restart lockout |
Wiring notes
- A1 and A2 are the supply, and the contact is usually 15 common, 16 normally open, 18 normally closed.
- The timer runs on its own supply, not on the load current, so a 16 A contact can switch a contactor coil without the timer seeing the motor current.
- For a cycling duty, set the on and off times separately; a symmetric timer set to 50 percent is not the same as a cycler with different periods.
COMMON QUESTIONS
Frequently Asked Questions
A1 and A2 take the supply. The contact is 15 common with 16 normally open and 18 normally closed on the common 8-pin base. The load or contactor coil goes through 15 and 16 for a delay-on-contact.
On-delay starts timing when the supply is applied and changes the contact after the set time. Off-delay keeps the contact in its operated state for the set time after the supply is removed. The WTA1 is a power-on delay, which is the on-delay case.
In a circuit diagram it is a coil with a clock or a square with a diagonal, and the contact carries a small arc or clock symbol to show the delay. The terminal numbers 15/16/18 are the practical identifier in a panel.
It can, if it switches the two contactor coils in turn, but the WTT8-S1 is the purpose-built asymmetric cycler for that duty. A multifunction relay can do it too, with more settings to get wrong.
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