what are ABCD curves in MCBs and how we observe that curves?
Answers were Sorted based on User's Feedback
Answer / raja
Type B :
MCBs react quickly to overloads, and are set to trip
when the current passing through them is between 3 and 4.5
times the normal full load current.
Type C :
MCBs react more slowly, and are recommended for
applications involving inductive loads with high inrush
currents, such as fluorescent lighting installations. Type C
MCBs are set to trip at between 5 and 10 times the normal
full load current.
Type D :
MCBs are slower still, and are set to trip at between
10 and 20 times the normal full load current. They are
recommended only for circuits with very high inrush
currents, such as those feeding transformers and welding
machines.
Type A:
i have no idea on it
Is This Answer Correct ? | 4 Yes | 1 No |
Answer / janet roadway
There is no A curve type within the IEC 60898 product
standard. The standard curves are B, C and D
Type B :
MCBs are set to trip when the current passing
through them is between 3 and 5 times the normal full load
current. The calibration temperature of this full load
current can vary from manufacturer but is generally in the
region of 30 - 40 degrees Celcius to allow for the heat
generated by the MCB within a distribution board.
Type C :
MCBs react more slowly, and are recommended for
applications involving inductive loads with high inrush
currents, such as fluorescent lighting installations. Type C
MCBs are set to trip at between 5 and 10 times the normal
full load current. Temperature as above
Type D :
MCBs are slower still, and are set to trip at between
10 and 20 times the normal full load current. They are
recommended only for circuits with very high inrush
currents, such as those feeding transformers and welding
machines. Temperature as above.
Some manufacturers produce their own specialist curves -
such as the ABB 'K' Curve which are designed for specific
applications such as tranformer feeds and motors. These
curves can be very useful.
Is This Answer Correct ? | 1 Yes | 0 No |
What are the electrical engineer roles and responsibilities in chemical plant?
what are the ratings of sockets?
what is the difference in operation of 3 phase motor when am forward delta connection and reverse delta connection?
various transmission tower like .,D tower ,K.C.O tower ,C.C.O tower,K.C.R tower ,C.C.R tower ,H.C.O tower in different tons.
1.Why sinle phase motor is not self starting 2.working principle of alternator 4.list out electrical formula
can we use the 110 v primary Tr 240 v secondary step up Transformer as reverse 240 pri 110 sec
Is there a standard depth of gravel fill in Substation Switchyard? Please give a design/drawing. Thank you.
Why negative feedback is preferred in the control system?
what is the use of capacitor bands?
What is proximeter? where it is used and why?
Ash AAAC conductor is used for which KV lines
what is field flash