Rishabh 252-PMT Thermistor Trip Relay, Automatic Reset
- Brand
- Rishabh
- Model number
- 252-PMT
- Category
- Protection & Monitoring Relays
Motor thermistor trip relay for PTC sensors in the stator winding: de-energises when they reach the trip temperature; automatic reset, DPDT contacts.
Price and availability on request
Key features
- Works with PTC thermistors fitted in motor stator windings
- LED trip indication
- 2 pole relay contacts
- DIN-rail or wall mounting
- Applications: sustained overload, single phasing, locked rotor, blocked ventilation, high ambient temperature
- Automatic reset
Specifications
| A.C. 50 / 60 Hz | 110, 120, 220, 230 & 240 V ±20% |
|---|---|
| D.C. | 12, 24, 48, 110 or 125 V ±20% including ripple |
| Burden | 4 VA approx. |
| Thermistors | 3 kΩ is normal for 3 thermistors in a 3-phase motor, to trip at 160 °C (= 750 Ω at 23 °C) |
|---|
| 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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