Rishabh 253-PHD Under & Over Frequency Relay
- Brand
- Rishabh
- Model number
- 253-PHD
- Category
- Protection & Monitoring Relays
Under & Over frequency relay for 50, 60 or 400 Hz systems with adjustable setpoint and differential (0.1 - 3.0 Hz at 50 / 60 Hz); for genset speed, standby and mains supplies.
Price and availability on request
Key features
- Adjustable setpoint
- Adjustable differential
- Internal time delay (factory settable)
- Energize / de-energize function swapping on request
- LED trip indication
- 2 pole relay contacts
- Auto reset
- DIN-rail or wall mounting
- Applications: under / over speed and frequency of gensets (governor), synchronous motors, standby, mains and computer supplies.
Specifications
| Nominal frequency | 50, 60 or 400 Hz |
|---|---|
| System voltage | 100, 110, 120, 230, 240, 400, 380, 415 or 440 V |
| Burden | 3 VA |
| Range (50 / 60 Hz) | 40 / 60 Hz and 50 / 70 Hz adjustable; differential 0.1 to 3.0 Hz adjustable |
|---|---|
| Range (400 Hz) | 360 / 440 Hz adjustable; differential 10 to 30 Hz adjustable |
| Repeatability | > 0.5% of full span |
| Time delay (optional) | 30 s max., on request |
| 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 | 75 mm wide x 70 mm high x 112 mm deep |
| Weight | Approx. 0.6 kg |
Specifications are from the manufacturer's published information. Confirm critical values with us or the datasheet before ordering.
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