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Numerical Over Current Relay. Based Over Current Relay (OCR) with Earth Fault Relay (EFR), these relays are extensively used for selective over current. Apart from this, applicable in substations and industrial networks, these relays are widely used for earth fault protection of radial feeders in impedance earthed power systems.
Features:- Definite time curve for both Phase & Earth along with optional user defined curve
- Low AC burden
- Reliable auxiliary supply of wide range input of 18-85 or 85-275 volts AC or DC
- Non-Volatile memory for data retention and retrieval in the event of power failure
- Unique combination of 50/51/50N/51N in a single gadget
- Consistent repeat accuracy
- High Drop-off/Pick-up ratio
- Poly carbonate front cover with external reset switch
Specifications:Accuracy Of Operating Time: For Idmt,Definite Time
and Instantaneous | ±5%, ±3% and Less than 2 Cycles |
Relay Rated Current (In) | 1A or 5A user selectable |
Frequency | 50 Hz or 60 Hz |
Auxiliary Voltage Range | 85V-275V AC/DC, 21-130V DC |
Pick-Up | 103% |
Drop-Off | 97% |
Ac Burden | < 0.4VA for 5A and < 0.2VA for 1A |
Dc Burden | < 5W during non operated condition and < 7W during operated condition |
Dimensions | 151 x181x195 mm (WxHxD |
Mounting | Flush |
Panel Cut-Out | 151 x 157 mm + 0.1mm |
Contact Rating | AC: 250 V @ 30 AMP and DC: 24 V @ 30 AMPS, 2 C/O or 3 C/O |
Operating Temperature | 5 to +55°C |
