NewTrend · Single-phase voltage monitoring relay
Product overview
NewTrend RV8-02 monitors its own single-phase supply using true-RMS measurement. Set separate upper and lower thresholds to define a voltage window. The relay monitors both limits, with fixed 3% hysteresis and an adjustable trip delay. The output is one SPDT contact rated 10A AC-1 in an 18mm DIN-rail housing. Four supply versions use different voltage-setting scales.
Technical selection summary
| Model | RV8-02 |
|---|---|
| Monitoring function | Combined overvoltage and undervoltage window monitoring |
| Supply / monitoring terminals | A1-A2 |
| Measurement | True RMS; own supply voltage |
| Supply versions | D12: DC 12V; AD48: AC/DC 24-48V; AD240: AC/DC 110-240V; A220: AC 220V |
| D12 operating / setting ranges | Operating: DC 7-20V; threshold setting: DC 9-15V |
| AD48 operating / setting ranges | Operating: AC/DC 18-270V; threshold setting: AC/DC 20-80V |
| AD240 operating / setting ranges | Operating: AC/DC 18-270V; threshold setting: AC/DC 65-260V |
| A220 operating / setting ranges | Operating: AC 160-270V; threshold setting: AC 180-260V |
| Supply frequency | 45-65Hz AC; 0Hz DC |
| Hysteresis | Fixed 3% |
| Trip delay Tt | Adjustable 0.1-10 seconds; 10% setting accuracy |
| Measurement error | Maximum 1% |
| Power-up delay | 0.5 seconds |
| Knob-setting accuracy | 10% of scale value |
| Reset time | 1000ms |
| Temperature coefficient | 0.05%/degree C at 20 degrees C |
| Supply indication | Green LED |
| Output indication | Red LED |
| Output contacts | 1 SPDT |
| Contact rating | 10A (AC-1) |
| Switching voltage | 250VAC / 24VDC |
| Minimum DC breaking power | 500mW |
| Mechanical life | 10,000,000 operations |
| Electrical life (AC-1) | 100,000 operations |
| Operating temperature | -20 to +55 degrees C |
| Storage temperature | -35 to +75 degrees C |
| Mounting | DIN rail to EN/IEC 60715 |
| Protection | IP40 front panel; IP20 terminals |
| Overvoltage category | III |
| Pollution degree | 2 |
| Maximum conductor size | Solid: 1 x 2.5mm2 or 2 x 1.5mm2; with sleeve: 1 x 2.5mm2 (AWG 12) |
| Terminal tightening torque | 0.8Nm |
| Body dimensions | 90 x 18 x 64mm |
| Weight | 59g |
| Referenced standards | EN 60255-1; IEC 60947-5-1 |
Operation
- The output monitors a window between the independent U< and U> settings; a sustained excursion through either limit trips after the selected delay Tt.
- Short excursions below the selected delay are ignored as illustrated. The output recovers through the corresponding fixed hysteresis band.
Typical applications
- Single-phase equipment voltage-supervision control circuits
- Control of normal/emergency power switching through suitable external equipment
View or download RV8-01/02 technical catalogue (PDF)
Product reference images and drawings
RV8-01/02 original specifications, supply ranges and selectors
RV8-01/02 original mode charts, setting logic, dimensions and wiring
Set U> above U< and set delay Tt from 0.1-10 seconds. The 3% hysteresis is fixed. Check the supply-version scale before choosing either threshold. Installation and wiring must be performed by qualified electricians.
