Phase Failure Relay Price in Pakistan 2026 — 3-Phase Motor Protection Guide
A phase failure relay (also called phase failure protection or single-phasing preventer) is what saves 3-phase motors from being destroyed when one of the three grid phases drops out. In Pakistan this happens routinely — transformer fault, downed line, blown DISCO fuse — and motors that keep running on the remaining 2 phases overheat within seconds. A PKR 1,400 phase failure relay prevents PKR 35,000-180,000 worth of motor rewind.
This guide covers phase failure relay prices in Pakistan for 2026, sizing for tubewells / factory motors / lift motors, wiring with contactors, and the CNC range.
1. What is a phase failure relay?
A phase failure relay continuously monitors all 3 line voltages (R, Y, B). When any one drops below threshold, the relay's output contact opens, breaking the contactor coil circuit and tripping the motor offline within 100-200 milliseconds. The motor stays off until all 3 phases return to normal voltage.
Most relays also detect:
- Phase reversal — if phase rotation is wrong, motor would spin backwards; relay prevents starting
- Phase asymmetry / unbalance — if phases are unequal in voltage by more than 10%, relay trips
- Over/under voltage — outside the 195V-265V envelope
2. Phase failure relay price in Pakistan 2026
| Model | Functions | Voltage | Price PKR |
|---|---|---|---|
| CNC YCP-3F basic | Phase failure + reversal | 380V 3-ph | 1,400 |
| CNC YCP-3F-AS | + asymmetry detection | 380V 3-ph | 2,200 |
| CNC YCP-3F-UO | + over/under voltage | 380V 3-ph | 3,200 |
| CNC YCP-3F-ALL | All protections + adjustable | 380V 3-ph | 4,800 |
| Chint NJB | Standard phase failure | 380V 3-ph | 2,400 |
| Schneider RM17TG | Premium full protection | 380V 3-ph | 15,500 |
| EPS PG-31 | Asia mid-range | 380V 3-ph | 1,800 |
3. Pakistani applications
| Application | Recommended PFR |
|---|---|
| Tubewell 1.5-5 HP motor | CNC YCP-3F (PKR 1,400) |
| Factory motor 5-15 HP | CNC YCP-3F-AS asymmetry (PKR 2,200) |
| Lift motor / elevator | CNC YCP-3F-ALL (PKR 4,800) — full protection mandatory |
| Sugar mill / paper mill main | Schneider RM17TG or CNC YCP-3F-ALL |
| HVAC chiller compressor | CNC YCP-3F-UO (over/under voltage included) |
4. Wiring with contactor + overload
- Wire 3-phase supply L1, L2, L3 to PFR sensing terminals R, Y, B.
- Wire PFR's NC contact in series with: STOP push-button + thermal overload NC + START push-button (latched via contactor NO aux contact) + contactor coil A1, A2.
- Tune PFR thresholds: typical under-voltage trip at 195V, over-voltage trip at 265V.
- Test: simulate phase loss by switching off one MCB; PFR LED should change colour and motor should trip within 200ms.
5. FAQ
Cheapest phase failure relay in Pakistan 2026?
CNC YCP-3F at PKR 1,400 — phase failure + phase reversal protection. Suitable for tubewells and small factory motors.
Phase failure relay vs phase sequence relay — same thing?
Phase failure detects loss of a phase. Phase sequence detects wrong rotation direction. Most modern PFRs (including CNC YCP-3F) do both.
Will it protect against single phasing on single-phase motors?
No — single-phase motors have only one phase. This relay is for 3-phase motors only. Single-phase motors get overload + voltage protectors instead.
How often does phase failure happen in Pakistan?
Common — 5-20 events per year on a typical DISCO feeder. Cheap insurance via the PKR 1,400 relay.
Does CNC YCP series carry IEC certification?
Yes — IEC 60947-5-1, PSQCA approved. 5-year CNC warranty.
6. Related guides
7. Need a phase failure relay for your panel?
WhatsApp +92 326 1111 376. Free Pakistan delivery on orders over PKR 5,000.