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Local breaker backup relay- JRC 154
Features
- Wide OC setting range
- Wide time setting range
- Fast reset time
- High drop-off / pickup ratio
Application:
JRC 154 local breaker backup relay, which is used to check the operation of distribution end circuit breakers and to trip feeder end circuit breaker if distribution end circuit breaker fails to trip
Principle of Operation:
If a fault occurs at the distribution end and the respective protective relay operates but the corresponding CB fails to operate then the system may have to face catastrophic consequences. JRC-154 is a instantaneous and definite time over current relay that also monitors the non-potential contacts of the downstreamprotective relays. The relay is designed to trip the feeder end CB if the protective relay at the distribution end operates but its corresponding CB fails to operate.
ACCURACY:
| Current protection |
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± 5% |
| Operating Time |
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± 5% |
RATINGS:
| Primary current rating |
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1A / 5A |
| Frequenc |
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50Hz |
| Auxiliary Supply |
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1) 20 to 60V DC |
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2) 75 to 150V DC / AC |
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3) 175 to 300V DC / 185 to 250V A |
CONTACT RATINGS:
| Rating |
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10A at 24V DC/230V AC |
CONTACT DURABILITY :
| Loaded contact |
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10,000 operations minimum |
| Unloaded contact |
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100,000 operations minimum |
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. 1KV RMS, 50 Hz for 1 minute across open contacts as per IEC 60255-5 |
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SETTINGS:
| Over Current |
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5 to 200% in steps of 5% |
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| Definite time |
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50 ms to 1.25 sec in steps of 10 ms |
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OVER LOAD RATING: |
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| AC Current input |
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2 times rated continuous |
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20 times rated for 3 sec |
BURDEN :
| AC 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 5W (Non Operated) |
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Less than 10W (Operated) |
OPERATING TIME:
| Instantaneous operating time |
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Less than 10 ms. |
ORDERING INFORMATION :
| Current rating |
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1A / 5A |
| Auxiliary supply |
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1) 20 to 60V DC |
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2) 75 to 150V DC / AC |
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3) 175 to 300V DC / 185 to 250V AC |
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