Rishabh 252-PSF Phase Loss & Unbalance Relay
- Brand
- Rishabh
- Model number
- 252-PSF
- Category
- Protection & Monitoring Relays
3-phase 3 or 4 wire monitor that trips on phase loss, phase reversal or unbalance (adjustable 5 - 15%) after an adjustable delay; protects motors from overheating.
Price and availability on request
Key features
- Protects against phase loss, phase reversal (sequence) and phase unbalance
- Adjustable unbalance and time delay
- LED indicates supply within limits and relay energised
- 2 pole relay contacts
- Auto reset
- Applications: portable pumps and compressors, motor single phasing, genset engine rotation, all rotating machines
Specifications
| System | 3 phase, 3 or 4 wire |
|---|---|
| Frequency | 50 or 60 Hz |
| Nominal voltage | 100, 110, 120, 220, 230, 240, 380, 400, 415 & 440 V (57 to 480 V) |
| Burden | 3 VA approx. |
| Voltage withstand | 1.2 x rating continuously, 1.5 x rating for 10 s |
| Unbalance | Adjustable 5% to 15% |
|---|---|
| Time delay | Up to 10 s adjustable, 30 s maximum |
| Type | D.P. changeover |
|---|---|
| Rating | A.C. 240 V 5 A non-inductive; D.C. 24 V 5 A resistive |
| Operations | 0.2 million at the above loads |
| Reset | Automatic |
| Operating temperature | 0 °C to +60 °C |
|---|---|
| Storage temperature | -20 °C to +70 °C |
| Temperature co-efficient | 0.05% per °C |
| Interference immunity | Electrical stress surge withstand and non function to ANSI/IEEE C37 90a |
| Enclosure | DIN-rail with wall mounting facility, flame retardant polycarbonate / ABS |
| Enclosure integrity | IP 50 |
| Dimensions | 55 mm wide x 70 mm high x 112 mm deep |
| Weight | Approx. 0.4 kg |
Specifications are from the manufacturer's published information. Confirm critical values with us or the datasheet before ordering.
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