AIR CIRCUIT BREAKERS - Electrical and Electronics Division

✦ Easy Setting through front panel DIP Switches.
✦ Indication for Power ON and trip status.
✦ Test feature - helps maintenance.
✦ Compact, Light weight helps in reducing panel size & thickness.
TECHNICAL DATA
CURRENT SENSING RELAYS
Single Phase Over current / Earth fault Relay
Sensitive E/� Relay and Instantaneous Current Relay
Model MC11A ME11A SC14S
Description 1 Ph O/C or E/� 1 Ph Sensitive E/� Instantaneous current relay
Device Code 50/51 or 50N/51N 50N/51N 87 N / 64 R
Design Microcontroller BasedMicrocontroller BasedStatic
�unctions Available Lowset O/C -ls Lowset S E/� -ls
Highset O/C -lhs
Lowset E/� -Os
Highset E/� -ls
Highset S E/� -lhs
Settings O/C ls = 50-200% Step 10% OR S E/� = 1-16% step 1%
E/� ls = 10-40% Step 2% OR HS S E/� = (2-16) xls ls = 10-40% step 5%
E/� ls = 20-80% Step 4%
HS O/C = (2-16) xls step 2 ls
HS E/� = (2-16) xls step 2 ls
in steps of 2 ls OR 20-80% step 10%
Time Characteristics available- Time Characteristics available- Time Characteristics available-
NI, VI, EI, or Definite Time NI, VI, EI, or Definite Time Instantaneous (25ms) OR
3 ranges of def Time (1, 10, 100) 3 ranges of def Time (1, 10, 100) time delayed 100ms / 200 ms
TMS : 0.1 - 1.6 Step 0.1 TMS : 0.1 - 1.6 Step 0.1 Self Powered
Other �eatures Site selectable Trip time Char. Site selectable Trip time Char. Relay testing Possible by ext.24V Supply
Highset can be disabled Highset can be disabled
Harmonic rejection
�lag indication / LED indication
Burden on CT 0.25 VA on CT 0.25 VA on CT 6 VA
Burden on PT Not applicable Not applicable Not applicable
Operating temp 0° to 55° C 0° to 55° C 0° to 55° C
Weight < 1.5kg < 1.5kg < 1.5kg
Burden on Auxiliary supply 5.5 VA 5.5 VA Not applicable
Output Contact 2 C/O Contacts (S/R) 2 C/O Contacts (S/R) 2 C/O Contacts (S/R)
Construction Drawout Drawout Drawout
Dim W x H x D in mm 71 x 158 x 224 71 x 158 x 224 71 x 158 x 224
Panel Cutout 62 x 142 62 x 142 62 x 142
5/5
5