Interested to Buy Any Domain ? << Click Here >> for more details...
What are the difference between C-Curve and D-Curve for
MCB's.
- 17 Answers
- 191750 Views
- ABB, DLF, Essar, GK companies, Nissi Engineering Solution, I also Faced
- E-Mail Answers
Answer Posted / simon
Awesome thread with a lot of almost correct and mostly
correct answers.
The challenge is knowing to which standard a particular
breaker was manufactured.
AS/NZS 4898 specifies:
B Curve between 3 In and 5 In
C Curve between 5 In and 10 In
D Curve between 10 In and 14 In
This was an update to AS 3947.2 which specified:
B Curve between 3.2 In and 4.8 In
C Curve between 7 In and 10 In
D Curve between 10 In and 14 In
The application notes in #11 and #13 are pretty much spot on.
Now lets assume we're only using AS/NZS 4898 breakers.
Lets assume we're using a Clipsal C60 10A B curve breaker.
The breaker should operate electromagnetically (<0.2s)with
an inrush current greater than 30A (3 x 10A).
The same 10A breaker however with 15A of current will not
trip electromagnetically but will trip thermally between 30
and 600 seconds after load is applied.
A C curve breaker of the same type should not operate
electromagnetically at either 15A or 30A. It should operate
thermally between 30 and 1000 seconds after a 15A load is
applied and between 6 and 50 seconds after a 30A load is
applied.
Note the distinct difference between and instantaneous /
electromagnetic trip and a delayed / thermal trip.
| Is This Answer Correct ? | 10 Yes | 4 No |
Post New Answer View All Answers
Why human body feel electric shock?
Pls mail me utility & Dg related question with answer
we have 2.2kw,Y,3000rpm motor but 6leads found in TB what happen if we connect in delta?
c++ write a program to use a fuction call "max"which accepts an intger arrey of size5.as an arrument and return the larger and smallest of the arrey to main without changing. the original changing of the original position of the element of the arrey.
What is the magnetic field (coil DC ) of Turbo Expander?
can we choose current transformer secondary, to calculate residual flux in a power transformer, so as its saturation is close to the saturation level of power transformer?
How does zener phenomenon differ from avalanche breakdown?
How to determine alternating current frequency?
i want use the cable size 16cx4 core aluminium usege watts 240x2000w this cable size is correct?
Why PS class CT is always preferred for Differential protection?
How to calculate fault level of 11 KV system
what is arc flash and what are the hazards involved
Why we make earth connection with Transformer Body and What will be the minimum size of copper wire as per code with respect to KVA rating of Transformer?
Why generation voltage in thermal power plant is between 11kv to 33kv?
what is transient enclosure vltage , very fast transients, very fast transient over voltages
