Answer / prasanna

Isolator is a switch which cant do the breaker function.
Breaker can trip very high voltage with provided arc
quenching ability.

Answer / sindhejs

Basically isolator is an switch manually used to off the
circuit.Isolator with fuse unit can do function of breaker
that is over load tripping by fuses.

Answer / sachin kumar chauhan

Basically isolator is an switch manually used to on or off
the circuit.but the bracker have many safty as short
circuit,earth folt,over load,under voltage & over voltage.

Answer / anand yadav

The isolators are manually operated switches rated for different voltages and current and selected as per application. The isolators are of two types:
Off Load Isolator and On Load Isolators.
Off Load Isolators cannot be used to break the circuit on load, so it is provided with some mechanical or electrical interlock to avoid on load breaking, otherwise it may be dangerous for operator and the equipment.
On Load Isolator can be used to break the circuit on load but cannot substitute the Breaker.
The Breakers have remote operating features with many in built protections and so many add on protections with high breaking and making capacity.
Hence Isolator cannot be used as Breaker.

in a simple IDMT relay we use neutral point of ct for earth fault then what is the requirement of neutral ct and cbct?

1 Answers  

---

if we have a industrial load of 400 kilowatts with 415 volt AC then how much total harmonic distortion (thd%) should be acceptable for steady power system.

1 Answers  

---

how to calculate cable size with respect kw

0 Answers   SPMI,

---

When and where resistance earthing is used ? How to calculate the time constant for earth fault

1 Answers  

---

what is the earthing condition between earth & neutral.

6 Answers   ABB,

---

we erected (48HP)63kva dist transformer and incoming from 11kv line,out going is 415v domastic line 2.04 km.for that actual output current is 84A. what are the losses and final output current.

3 Answers   Essar,

---

What happened when voltage will half value of current ...

1 Answers   SCL,

---

directional over current relay when acted & how it works

3 Answers   NCC, ThyssenKrupp,

---

sir , what happen if we decrease ( approx 3 inch ) the lenth of shaft in 110KW Induction , three phase motor. actually a 110KW motor is couppled with star couplling to 120TR compressor. When we doing maintenance in compressor it is required to skid the motor backword and resulting dis- alightnment . so we want to change the tyre coupling in place of existing coupling. so it is required to cut off the rotor aprox 3 inch form driving side.

2 Answers  

---

what are the safety of chiller.

7 Answers  

---

Please clarify 1. Icw: rated short circuit working withstand capacity 2. Icu: Rated ultimate breaking capacity 3. Ics: Rated service short circut withstand capacity 4. other specification of ACB

1 Answers  

---

A 400KVA transformer has 400 Hz frequency. If the frequency is changed to 50 Hz, then what will be the new KVA rating?

1 Answers   Spectrum,

---