NewTrend · earth leakage monitoring relay
Product overview
NewTrend RLE8-S monitors residual current in single-phase or three-phase systems using an external zero-current transformer. It has an AC 85–265V, 50/60Hz auxiliary supply and adjustable leakage-current settings from 30mA to 30A. Type A true RMS measurement, an LCD residual-current display and keypad settings provide separate trip and alarm outputs, selectable reset and adjustable delay functions.
Technical selection summary
| Model | RLE8-S |
|---|---|
| Function | Residual-current monitoring relay for single-phase/three-phase systems |
| Measurement | Type A true RMS |
| Auxiliary supply | AC 85–265V, 50/60Hz |
| Supply terminals / burden | A1–A2 / 3VA |
| Leakage-current setting | 30mA to 30A |
| Trip level limit | 85% of set value (catalogue specification) |
| Trip delay | 0–99.9s |
| 30mA setting | Trip delay forced to 0 |
| Reset mode | Manual / automatic |
| Output | 2 SPDT: R1 Trip / R2 Alarm |
| Contact rating | 10A, AC1 |
| Switching voltage | 250VAC / 24VDC |
| Minimum DC breaking capacity | 500mW |
| Response time | ≤30ms at residual current ≥5×IΔn; ≤50ms at residual current = IΔn |
| CT connection monitoring | Detects absent or shorted external transformer connection |
| Accuracy | Trip: ±5% of set trip current; time: ±5% of set time ±50ms |
| Test / reset | Front controls and remote test/reset terminals |
| Mechanical / electrical life | 10,000,000 operations / 100,000 operations (AC1) |
| Operating / storage temperature | -20 to +55°C / -35 to +75°C |
| Humidity | Up to 95% RH, non-condensing |
| Mounting / enclosure | DIN rail EN/IEC 60715 / IP20 |
| Installation environment | Any operating position; overvoltage category III; pollution degree 2 |
| Terminal wiring / torque | 1×2.5mm² or 2×1.5mm² / 0.4N·m |
| Body dimensions | 90×36×70mm |
| Weight | 118g |
| Reference standard | IEC 60947-2 |
| External CT models | CT26AL / CT45AL / CT63AL / CT80AL / CT100AL / CT150AL / CT200AL; purchased separately |
| Power-on delay | 0–99.9s |
| Automatic reset delay | 0–999s |
| Hysteresis | 5–40% of trip level |
| Alarm threshold | 50–100% of trip current setting |
| Instantaneous trip selection | ON/OFF at 5×set current |
| Normal relay state | R1 Nd: normally de-energised / Ne: normally energised |
| Display / settings | LCD with residual-current and set-value display; keypad parameter setting |
Operation
- Hold M for 3 seconds to enter settings and hold for 3 seconds again to save. The LCD shows measured residual current, trip setting and relay status.
- Set leakage current, trip delay, power-on delay, reset mode/delay, normal relay state, alarm percentage and hysteresis as applicable.
- Select the 5×current instantaneous trip function ON/OFF. At a 30mA trip setting the function diagram specifies zero delay.
Typical applications
- Residual-current supervision in industrial control panels
- Earth-leakage monitoring with a matched external transformer and external circuit-breaker trip circuit
Product reference images and drawings
RLE8-S original catalogue technical reference 1
RLE8-S original catalogue technical reference 2
RLE8-S original catalogue technical reference 3
RLE8-S original catalogue technical reference 4
The external zero-current transformer is purchased separately. Match its model and the external breaker release circuit to the catalogue wiring diagram. This relay supplies control contacts; the power circuit is interrupted by the coordinated external switching device. The catalogue specifies shielded or twisted-pair CT wiring (≥1m) and remote Test/Reset wiring ≤10m. Installation and wiring must be performed by qualified electricians.
