NewTrend · LCD voltage monitoring relay
Product overview
NewTrend RV8-SV displays the monitored voltage on an LCD and provides independently adjustable overvoltage and undervoltage thresholds, recovery values and trip delays. Set power-up and reset delays from 0.5 to 300 seconds, with automatic fault reset selectable ON or OFF. The two-module DIN-rail relay uses AC/DC 110-240V supply and has two SPDT outputs rated 8A AC-1.
Technical selection summary
| Model | RV8-SV |
|---|---|
| Function | Overvoltage and undervoltage monitoring |
| Display / measurement | LCD; true RMS |
| Supply / monitoring terminals | A1(+)-A2(-) |
| Rated control supply | AC/DC 110-240V |
| Supply frequency | 45-65Hz AC; 0Hz DC |
| Operation voltage range | 50-350V, per manual |
| Supply burden | AC maximum 3VA |
| Measurement error | Maximum 1% |
| Overvoltage threshold | 65-300V or OFF; 1V steps; factory 253V |
| Overvoltage recovery value | 60-295V; 1V steps; factory 248V |
| Undervoltage threshold | 65-300V or OFF; 1V steps; factory 187V |
| Undervoltage recovery value | 70-305V; 1V steps; factory 192V |
| Voltage-fault trip delays | 0.1-20 seconds; factory 2 seconds |
| Power-up delay | 0.5-300 seconds; factory 0.5 seconds |
| Reset delay | 0.5-300 seconds; factory 1 second |
| Fault reset | ON/OFF; factory ON |
| Setting constraint | With both protections enabled: U> at least 10V above U< |
| Output contacts | 2 SPDT |
| Contact rating | 8A (AC-1) |
| Switching voltage | 250VAC / 24VDC |
| Operating temperature | -20 to +60 degrees C |
| Storage temperature | -35 to +75 degrees C |
| Mounting | DIN rail to EN/IEC 60715; 2 modules |
| Protection | IP40 front panel; IP20 terminals |
| Operating position | Any |
| 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 | 0.4Nm |
| Dimensions (native drawing) | 90mm body height; 95mm overall; 36mm maximum width; 70mm depth |
| Weight | 100g |
| Referenced standards | EN 60255-1; IEC 60947-5-1 |
When both protections are enabled, set the overvoltage threshold at least 10V above the undervoltage threshold. Confirm enclosure space against the dimension drawing for the supplied version.
Operation
- Set overvoltage and undervoltage thresholds and their respective recovery values. Either protection can be disabled with OFF; when both are enabled, the upper threshold must be at least 10V above the lower threshold.
- Overvoltage and undervoltage trip delays are adjustable from 0.1 to 20 seconds. Power-up and reset delays are each adjustable from 0.5 to 300 seconds.
- Automatic fault reset is selectable ON/OFF. The timing diagram shows the output and LCD indication through voltage excursions and recovery.
Typical applications
- LCD voltage supervision in equipment connection control circuits
- Normal/emergency supply control through suitable switching equipment
Specify your enquiry
For a focused quotation, include:
- Monitored voltage, desired thresholds, recovery values and trip delays
- Automatic or manual fault reset and start/reset delay requirements
- Load/contactor details, quantity, enclosure clearance and destination
Download NewTrend RV8-SV datasheet (PDF)
Product reference images and drawings
Terminal connections
Voltage faults, recovery and output sequence
Dimensions from the native RV8-SV drawing; confirm the supplied housing version.
Contactor-control reference circuit
Hold MD for 3 seconds to enter the parameter menu. Use the up/down keys to adjust values; holding a key changes the value rapidly. Hold MD for 3 seconds to save and exit. A 60-second inactivity exit does not save changed values. With normal supply, press R/T for 0.5 second to test relay operation. Installation and wiring must be performed by qualified electricians.
