NewTrend · three-phase voltage and current protector
Product overview
NewTrend PS8-03 monitors three-phase voltage and current using true RMS measurement and provides adjustable overvoltage, undervoltage, overcurrent and voltage-unbalance protection. Its LED panel shows the three phase-to-neutral voltages, phase currents and fault status. The protector is rated 63A AC-1, uses AC 220V L1/L2/L3-to-neutral supply and automatically resets after fault recovery. Choose the factory upper- or lower-incoming wiring version.
Technical selection summary
| Model | PS8-03 |
|---|---|
| Function | Overvoltage, undervoltage and overcurrent |
| Measurement and display | True RMS; three phase voltages, three phase currents and LED fault status |
| Incoming-line versions | PS8-03U: upper incoming; PS8-03D: lower incoming |
| Rated supply voltage | AC 220 V (L1, L2, L3–N) |
| Rated supply frequency | 45–65 Hz |
| Operating voltage range | 80–400 V (L1, L2, L3–N) |
| Rated operational current | 63 A (AC1) |
| Burden | AC max. 3 VA |
| Overvoltage operating value | OFF or 230–300 V |
| Undervoltage operating value | 140–210 V or OFF |
| Overvoltage / undervoltage action delay | 0.1–10 s |
| Overcurrent operating value | 1–63 A |
| Overcurrent action delay | 2–600 s |
| Voltage unbalance value | 20–99 V |
| Voltage unbalance action time | 10 s |
| Power-up delay | 2–600 s |
| Reset time | 2–900 s |
| Measurement error | ≤1% |
| Electrical life (AC1) | 1 × 10⁴ |
| Mechanical life | 1 × 10⁶ |
| Operating temperature | -20 to +60 °C |
| Storage temperature | -35 to +75 °C |
| Mounting / DIN rail | DIN rail EN/IEC 60715 |
| Protection degree | IP40 front panel / IP20 terminals |
| Operating position | Any |
| Overvoltage category | III |
| Pollution degree | 2 |
| Dimensions | 82 × 72 × 68 mm |
| Weight | 376 g |
Operation
- Choose PS8-03U for upper incoming line or PS8-03D for lower incoming line. Connect all phases and neutral according to the exact wiring diagram.
- Set overvoltage to OFF or 230-300V and undervoltage to 140-210V or OFF. The voltage-fault delay is adjustable from 0.1-10s.
- Set overcurrent from 1-63A and the separate overcurrent delay from 2-600s. Voltage-unbalance setting is 20-99V with a 10s action time.
- Set power-up delay within 2-600s and reset delay within 2-900s. The LED panel displays phase voltages, phase currents and fault indicators.
Typical applications
- Three-phase household-equipment supply monitoring and protection
- DIN-rail distribution panels requiring adjustable voltage, current and voltage-unbalance protection
View or download PS8-03 technical catalogue, September 2026 (PDF)
Product reference images and drawings
Original September 2026 exact-model technical parameters and model code
Original September 2026 function, wiring and dimension drawings
Use the exact PS8-03U upper-incoming or PS8-03D lower-incoming wiring diagram, including neutral. Supply and voltage thresholds are phase-to-neutral. The 63A rating is AC-1; coordinate separate upstream circuit and short-circuit protection for the actual installation. Installation and wiring must be performed by qualified electricians.
