Motor Protection Relay JRC 113

Additional Details

Principle of Operation:

This is a Microprocessor based relay which has been designed to sense the load currents in all the three phases of an AC motor. It monitors the levels of these currents continuously, giving output signals for relay and LED driver circuits.

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.

Aux. Supply :

1) 20 to 60V DC

2) 75 to 150V AC / DC

3) 175 to 300V DC

    185 to 250V AC

Insulation:

2KV RMS, 50 Hz for 1 minute / 2.5 KV for 1 sec . Between all terminals and earth. 

1 KV RMS, 50 Hz for 1 minute across open contacts 

Settings:

Current setting ranges :  O/c 50 to 200% in steps of 10% 

Locked rotor current : 50 to 800% of rated current in steps of 50%

Block on Start time setting range (T1) : 5 to 35 seconds in steps of 2 sec.

O/C withstand time setting range (T2) : 1 to 16 seconds in steps of 1 sec.

Locked rotor withstand time setting range (T3) : 0.5 to 4 seconds in steps of 0.25 sec.

Burden:

current input :

0.2VA Per phase (at Rated 5A)

0.05VA per Phase (at Rated 1A)

Aux. supply :

Less than 8W ( Non operated) 

Less than 10W (Operated)