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Motor protection relay - JRC 113
Features
- Software based design
- ‘Block on Start’ feature provides very accurate overload protection
- Definite time over load protection
- Locked rotor current protection
- Single phasing protection
- Wide setting ranges
- Draw -out case
Application:
The relay provides Over load protection of AC motors driving conveyors, crushers, machine tools, compressors, fans etc.
Principle of Operation:
This is a software based relay which has been designed to sense the load currents in all the three phases of an AC motor and monitor the levels of these currents continuously, giving output signals for relay and LED driver circuits.
ACCURACY:
| Accuracy of time setting |
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± 5 with a minimum error of ±50m secs. |
RATINGS:
| Current rating ( In ) |
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1A / 5A |
| Aux. Supply |
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1) 20 to 60V DC |
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2) 75 to 150V AC / DC |
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3) 175 to 300V DC or 185 to 250V AC |
CONTACT RATINGS:
| TRIP / ALARM |
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| Rating |
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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 :
| Weight |
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2500 gms. (approx) |
| Case Size |
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144sq mm, depth 232mm |
| Installation |
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Flush mounting |
| Panel cutout |
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138mm x 138mm |
INSULATION:
| 1. 2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1 sec .Between all terminals and earth. |
| 2. 1 KV 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 |
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SETTINGS:
| Current input |
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O/c 50 to 200% in steps of 10% |
| Locked rotor current |
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50 to 800% of rated current in steps of 50% |
| Block on Start time setting range (T1) |
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5 to 35 seconds in steps of 2 sec. |
| O/C withstand time setting range (T2) |
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1 to 16 seconds in steps of 1 sec. |
| Locked rotor withstand time setting range (T3) |
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0.5 to 4 seconds in steps of 0.25 sec. |
OVER LOAD RATING: |
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| Over load capacity |
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2 times rated continuous 20 times rated for 3s |
BURDEN :
| Current input |
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0.2VA Per phase (at Rated 5A) |
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0.05VA per Phase (at Rated 1A) |
| Aux. supply |
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Less than 8W ( Non operated) |
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Less than 10W (Operated) |
ORDERING INFORMATION :
| Relay type |
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JRC 113 |
| Current rating |
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1A or 5A |
| Aux. Supply |
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20 to 60V DC or |
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75 to 150V AC/ DC or |
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175 to 300V DC (185 to 250V AC) |
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