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Earth leakage relay - JRC XXX
Features
- Solid state reliability
- Built in Test facility
- Very low primary current sensing
- Core balance current transformer supplied along with the unit
Application:
The relay used for protection of LV/MV distribution systems requiring very high sensitivity for earth faults.
Principle of Operation:
The relay measures the earth leakage current from theCBCT and if it exceeds the threshold, it extends a trip signal after the operating time.
ACCURACY:
| Drop-off / pick-up |
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Between 80% to 95% |
| Operating Time |
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±5% or ±30ms whichever is higher |
CONTACT RATINGS:
| TRIP / ALARM |
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| 2 c/o |
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5A at 24V DC/ 230V AC |
| 1 c/o |
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10A at 24V DC/ 230V AC |
CONTACT DURABILITY :
| Loaded contact |
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10,000 operations min. |
| Unloaded contact |
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100,000 operations min. |
MECHANICAL DESIGN :
| Installation |
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JRC 172 & JRC 173 Flush mounting |
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JRC 272,273 & 274 Din rail mounting |
| Panel cutout dimension |
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| JRC 072 / 073 |
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73 X 137 mm (WxH) |
| JRC 172 / 173 |
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43 X 91 mm (WxH) |
| JRC 272 / 273 / 274 |
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78 X 47 mm (WxH) |
INSULATION:
| 1. 2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1 sec . Between all terminals and cases . |
| 2. 1KV RMS, 50 Hz for 1 minute across open contacts |
STANDARD COMPLIANCE:
| Accuracy Test |
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IEC 60255-3 |
| Insulation Test |
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IEC 60255-5 |
TERMINAL DIAGRAM : |
| Note |
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Wiring Diagram of relay types are given on request |
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SETTINGS:
| Relay setting |
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| JRC 072 |
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0.5A to 8.0A in steps of 0.5A |
| Definite time setting |
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1 – 15 sec in steps of 1sec |
| JRC 073 |
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0.3A to 4.8A in steps of 0.3A |
| Definite time setting |
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1 – 15 sec in steps of 1sec |
| JRC 172 |
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0.3A to 1.8A in steps of 0.1A |
| Definite time setting |
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0 – 1.5 sec in steps of 0.1sec |
| JRC 173 |
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0.5A to 8.0A in steps of 0.5A |
| Definite time setting |
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0 – 15 sec in steps of 1.0 sec |
| JRC 272 |
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0.3A – 1A & 3A - 10A |
| Definite time setting |
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0.05 – 0.3s & 0.5 - 3s |
| JRC 273 |
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0.3A – 1A & 3A - 10A |
| Definite time setting |
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0 – 0.5s |
| JRC 274 |
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0.1A – 0.25A & 0.3A - 0.75A |
| Definite time setting |
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0.05 – 0.3s & 0.5 - 3s |
| Operating characteristics |
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| Operating time |
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| Instantaneous |
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Less than 40 milli seconds |
| Definite time setting |
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As mentioned above |
OVER LOAD RATING: |
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| Over load continuous |
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Withstands continuous primary fault current of 400 A. |
| Short time |
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Withstands primary fault current of 1200A for 10seconds |
BURDEN :
| Aux. Supply |
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Less than 5W |
ORDERING INFORMATION :
| Relay rating type |
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JRC 072,JRC 073,JRC 0172,JRC 0173,JRC 0272,JRC0273 |
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JRC 0273,JRC 0274 |
| Aux. Supply |
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110V AC, 230V AC,415V AC( only for JRC 072 &73) |
| Inner diameter of CBCT |
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100, 200, 300, 400 mm. are standard for circular CBCTs |
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all dimensions should be given. |
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