Microprocessor relays for voltage monitoring, phase loss, Earth leakage, and motor thermal protection
Electrical equipment is highly vulnerable to power quality anomalies including phase failure, voltage asymmetry, over/under-voltage, and Earth leakage faults. Nairobi Power Engineers supplies and integrates Lovato Electric microprocessor-based protection relays designed to trip switchgear before expensive damage occurs.
Our range includes Lovato PMV/PMA voltage and phase monitoring relays, TM series motor thermal and thermistor relays, and R2D/R4D Earth leakage relays with external core balance toroid sensors for complete switchboard and machinery safety.
Lovato PMV / PMA • Voltage Monitoring
DIN-rail electronic relays monitoring phase loss, neutral loss, incorrect phase sequence, overvoltage, undervoltage, and phase asymmetry.
Lovato R2D / R4D • Earth Leakage
Core-balance Earth leakage relays with adjustable current sensitivity (30mA to 30A) and selectable time delay (instantaneous to 5s).
| Relay Model | Monitored Parameter | Trip Thresholds | Output Configuration |
|---|---|---|---|
| Lovato PMV10 / PMV20 | Phase Loss, Phase Sequence, Neutral Loss | Fixed thresholds (< 70% Un) | 1 SPDT 8A 250V AC relay |
| Lovato PMV50 / PMV70 | Overvoltage, Undervoltage, Asymmetry | Over: 105–115%, Under: 80–95%, Asym: 5–15% | 2 SPDT 8A with adjustable delay 0.1–20s |
| Lovato R2D / R4D | Type A / AC Earth Residual Current | IΔn: 0.03 A – 30 A (9 steps) | 1 Pre-alarm + 1 Main Trip Contact |
| Lovato TM P | PTC Motor Temperature Sensor Input | Trip at PTC R > 3.1 kΩ, Reset < 1.6 kΩ | 1 SPDT 8A contact with manual/auto reset |
Contact our protection engineers for technical advice on voltage and Earth leakage relay selection.
