AUMSHIVAY ENGINEERING PRIVATE LIMITED
B-21, Bhan Nagar, Queens Road, Jaipur-302021
Website: www.aumshivay.com, www.omengineering.in
E-mail:admin@aumshivay.com
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REG. OFFICE:VILLA NO. 60,LATA NAGAR, KALWAR ROAD, JHOTWARA, JAIPUR - 302012
TECHNICAL SPECIFICATIONS (FEEDER PROTECTION RELAY-MC12A)
Current (IS): One of the three ranges (User selectable)
10% to 40% of In in steps of 2% or 20% to 80% of In in steps of 4 %
or 50% to 200% of in steps of 10%.
High-set Current (Ihs): 2 Is to 16 Is in steps of 2 Is and disable.
Time Multiplier TMS: 0.1 to 1.6 in steps of 0.1.
Operating
Characteristics
Front panel programmable, using push buttons.
Time /Current characteristics;
Pick up current; Same as set current Is.
Reset Current: 95% to 90% of set current Is.
Inverse time;
Four curves, As per IS 3231:1987.
a) Normal Inverse 3s
b) Normal Inverse 1.3s
c) Very Inverse
d) Extremely Inverse
Definite time;
Three curves as follows:
e) Definite Time 1s
f) Definite time 10s
g) Definite time 100s
Accuracy: As per Error class 5 of IS3231: 1987
Reset time: Less than 50 milli sec
High-set (Instantaneous trip):
Accuracy: As per Error class 5 of IS3231: 1987.
Operating time: Less than 50 ms for Iin < 1.5 Ihs
Less than 35 ms for Iin > 1.5 His (Iin = input current)
Less than 0.25 VA on all settings.
Less than 5.5 VA at Auxiliary Power supply
Separate LED indications for:
• Power on
• Trip status (LED blinks when input crosses set point and becomes steady on when relay
has tripped. LED has to be manually reset)
• Time current characteristics selected
• 2 c/o contacts for trip signal (self reset)
Rated voltage: 250 V AC / 30 V DC, Max. S/W voltage: 440 V AC / 300 V DC
Rated current: 8A , Max. Current: 14A
Rated Breaking Capacity: 2000VA / 240 W (Resistive)
2 In continuously, 20 times In for 1 sec.
Front Bezel: 158 x 71 mm, Panel Cutout: 142 x 62 mm , Depth:224 mm
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