Interested to Buy Any Domain ? << Click Here >> for more details...
what are ABCD curves in MCBs and how we observe that curves?
- 2 Answers
- 6255 Views
- I also Faced
- E-Mail Answers
Answer Posted / 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 |
Post New Answer View All Answers
What is the effect of solar radiation on the design of an Isolated Phase Busduct?
What is resolution of a measurement?
Swg formulae
1.What is the range of stator resistance of 3-phase induction motor? 2.Two electrically operated vibro motors are foxed in parallel direction in vibrating feeders. what is the direction of both vibro motors?
1. What is maximum permissible distance between smoke detectors ? 2. How do we decide number of smoke detectors required in a large office, warehouse, hall etc ? 3. What should be maximum height of smoke detectors ? 4. Where do we use heat detector, optical smoke detector, temperature sensitive detector ?
What is the method to solve circuit using source transformation?
How to decide the size of the capacitor for a single phase induction motor say 2 HP ??
State norton’s theorem?
Why use the vcb at high transmission system ? Why can’t use acb?
What are the effects of electrical faults?
There is any especial requirement for motor to drive through with VFD?
L.A. (Lightening Arrester) is located at a place from where transmission line enters the transmitting substation. So L.A. (Lightening Arrester) is the first equipments which has to encounter with lightening, high voltage surges and switching surges. It has to absorb energy of lightening, high voltage surges, and switching surges. L.A. (Lightening Arrester) is made up of layers of semiconductors. If these layers can not tolerate energy released by lightening, high voltage surges, and switching surges the L.A. (Lightening Arrester) blasts.
Dear Sir I am living in Jaipur Rajasthan now I did complete my b tech degree in electrical engineering in 2012 Sir how I gate certificate of competency for electrical supervisor
What determines the thickness of the lamination or stamping?
if the number of poles generated in stator and rotor side of an induction motor are different then what will happen and why?
