Answer / desingurajan

MCBs are miniature circuit breakers with optimum protection facilities of overcurrent only.These are manufactured for fault level of up to 10KA only with operating current range of 0.5 to 63 Amps (the ranges are fixed), single,double and three pole verson.These are used for smaller loads -electronic circuits,house wiring etc.
MCCBs are Moulded case Circuit breakers,with protection facilities of overcurrent, earth fault.it has a variable range of 50% to 100% operating current.They can be wired for remote as well as local operation both.They are manufactured for fault levels of 16KA to 50KA and operating current range of 25A to 630Amps.They are used for aplication related with larger power flow requirement.

Desingh
RAjapalayam

Answer / kadher.304

mcb its thermal operated and use for short circit rating of
mcb 63amp(max)
mccb is thermal operated for over load current and magnetic
oprataion for instant trip in short circuit condition.rating
of 63amp(9min)

why stator winding of synchronous machine are connected in star connection ?

1 Answers  

---

what is the difference between ac ground and dc ground.. In my project iam using both ac and dc supply.. can both the grounds or the return paths be connected??

1 Answers  

---

why we use 6nos of C.Ts on 11kv incoming?

2 Answers  

---

After fault clearing in Tr line, whether the Metering core of CT is comes to normal condition from saturation region & its works as a normal condition?

1 Answers  

---

what is the chemical reaction of solt and charcoal in earthing?

1 Answers   Shyam Group,

---

If we want to change a contactor of faulty one what are the conditions want to fullfil

0 Answers   Qatar Shell,

---

depending on what we can choose the rate of mccb considering that we know the total load

2 Answers  

---

What is star-delta transformer?

0 Answers  

---

What is different between Difnit time and instatous over current relay

0 Answers   NCC,

---

If a air condition consume 2.50 to 3.00 amp then how much it will consume in watts if it is running 10 hours out of 24 hours????

0 Answers  

---

I need tnpsc AE Electrical question papers

2 Answers   TNPSC Tamil Nadu Public Service Commission,

---

the minimum clearance b/w ceiling and plane of leaf of ceilng fan shall be ..........mm

1 Answers  

---