Answer / chandru_williams

contactors are used to make or break a circuit.Its
unconditional.

But relays can be used for conditional switching or
breaking of a circuit.

Answer / kishor mochi

it is depend only load and load current.
if connected load is less then 5A,that case we are use
relay.
Exactly opposite side, if connected load equal lot grater
then 5A, that case we are use contactor.

Answer / sudarshan patwal

Relay current rating is max. 5A But Condactor current
rating is more than 5A.
Relay has one comman, 1NO & 1NC (Means comman is same for
NO & NC) which Condactor has seperate comman+NO & comman+NC.

Answer / khajamian

Contactors are devices consists of E shaped
electromagnectic core with winding are mainly used for NO
and NC connections which means making and braking of
circuit... we can split the flow of current by using
contactors...DC contactors and ac contactors are also
available.. it is used for high rating ... above 110v ac
and dc... But relays are also used for NO and NC changes
i.e making and breaking of circuits but especially for
remote or distant operation.. using 110 v ac supply..it
also consists of coil but absence of electromagnetic core..
there are several types of relays ..ex: industrial relay,
electromagnetic relay... etc

Answer / s. rahimzadeh

Contactors take palce against the circuit breakers (not
relays). Contactor acts like a circuit breaker and
similarly can get its command from a relay. Relays are used
for detecting the conditions which the circuit switch
(Circuit breaker or Contactor) should cut the circuit.

In what circumstanced the CT used for protection relay will be saturated?and what will happen to the relay is the CT is saturated?

3 Answers  

draw the full wave and half wave circuit of 3 phase system and inverter circuit used in ups 

0 Answers  

how slip power recovery system work

0 Answers   Ambuja,

why multiplying factor is used in wattmeter???

1 Answers   Nippon,

can i use 10 mfd + 6 mfd instead of 15 mfd capacitor in single phase motor as running capacitor

3 Answers  

why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?

0 Answers  

diff between UPS and inverter?

2 Answers  

What is the difference between "Earthing" and "Neutral"?

10 Answers   Power Grid,

what will happen to the core losses if we perform the open ckt test on high voltage side of a transformer ?

2 Answers  

what is the working principale of air circuit breaker ?

5 Answers  

Why we apply only reduced voltage to the alternator while conducting slip test ? also the current increases to a larger value with reduced voltage itself Why ?

1 Answers  

Is it good to short Neutral and Ground in the PLC or DCS main Power supply. Pls give YES or NO with reasons...? Simarpreet

0 Answers   Bindal Papers,