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

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.

should Dy11 and Dy1 group can be operated in parallel??????

1 Answers  

---

3phase motor 400v (induction) A.C 4kw company design 1400rpm but our requirement 2000rpm possible? attached any instrument. reply fast! contact 03343262442

3 Answers  

---

How can we calculate cable size in Low voltage & high voltage

0 Answers   United Breweries UB,

---

defination of static variable compensator

1 Answers  

---

what is the difference between earthing and grounding of electric circuits

5 Answers   HCL, Turbo,

---

what is the transformer rush current?

0 Answers  

---

What is the better way of passing 400 amp from sending end to receiving end ? By overhead line or underground cable and why ? if underground cable then how much depth require ?

1 Answers   Aditya Birla, HCL,

---

when giving a supply to wounded coil it will get magnetised, but the same is not if it is not wounded on a core..and it is getiing short....why.......

3 Answers  

---

BSNL TTA EXAM QUESTION

0 Answers   BSNL,

---

MCCB 400 Amps 50KA 430Volt AC What is mean by 50KA

16 Answers  

---

Explen all type electrical protection ? like O/C,E/F,NPS,VOLTAGE UN BLANCE,CURRENT UN BALANCE,NAGETIVE PHASE SEQ,AND ETC...............electrical Protection

6 Answers   Reliance,

---

why the NGR (neutral grounding resistor) always OFF during DG off?

0 Answers   Bhel,

---