AIR CIRCUIT BREAKERS - Electrical and Electronics Division

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Type of
Protection
PROTECTION
COMPUTER COMPATIBLE & COMMUNICATION CAPABLE
SALIENT �EATURES O� RELEASE TYPE SR61C
✦ Display of rms currents (Phase, Highest among phases) and Trip data by 4-seven
segment LEDs.
✦ Non-volatile memory for Storage and display of trip history for last 5 tripping
operations.
✦ Communication with PC and breaker control through RS485 port.
✦ Serial communication by MODBUS-RTU protocol.
✦ Separate indication for Power-ON and Programming mode or fault.
✦ Individual fault indication by LEDs. LED indication can be reset by the Reset button
on the release. However, resetting is not possible when fault is present.
✦ Direct tripping of breaker - Reliable and Minimum tripping time.
✦ Blocking function to inhibit any of the trip functions to achieve intelligent
discrimination.
✦ Protection against failure of breaker to trip within set time delay (Range : 0.05 s to
0.25 s in steps of 0.01 s)
✦ Automatic doubling feature to prevent nuisance tripping during motor starting. Can
be Enabled or Disabled.
✦ Protection settings can be changed through computer while breaker is carrying
current.
✦ 5 Output relays
R1 Used for trip output (Can be programmed in manual or auto reset mode)
R2 �or Instantaneous output
R3 �or opening the breaker
R4 �or closing the breaker
R5 �or indication of internal error / program error / auxiliary supply failure
✦ Auxiliary power supply required : 110V to 240V ac/dc +10%
Auxiliary power supply burden < 10 VA
Setting Ranges
Pick-up current Time Delay
Ir-0.5 to 1.0 times In 2 to 30 sec. at 6 times Ir
Long Time Steps : 0.50, 0.55, 0.60, 0.65, 0.70, 0.75,
0.80, 0.85, 0.9, 0.95, 1.00
Steps : 2, 10, 20, 30 sec
2 to 16 times In Inst. to 400 ms
Short Time Steps : 2, 3, 4, 6, 8, 10, 12, 14, 16 Steps : Inst., 100, 200, 300, 400 ms
0.2 to 0.6 times In 100 to 400 ms
Ground �ault Steps : 0.2, 0.3, 0.4, 0.5, 0.6 Steps : 100, 200, 300, 400 ms & Disable