What is the difference between Relay and Contactor
Answer Posted / sandeep
Contactor is a switching device. Unless & until you give
command it wont operate. Contactor is not a sensing device.
on the other hand Relay is the device which sense the
ubnormality & give command accordingly. Relay differentiate
normal & ubnormal condition which contactor can not.
In short if only contactor is connected in circuit.. in
case of ubnormal like OV or OC it will burn.. but if it is
connectedin coordination with relay.. relay will sense the
fault & give signal or command to contactor to trip
Is This Answer Correct ? | 212 Yes | 90 No |
Post New Answer View All Answers
what is the effect of un-synchronized power.
What are the significant parts of dc generator?
WITCH CARDS IN USE IN FIRE CONTROL PANEL.
how to prepare the technical test
what is relation between ct and pt ratio with multiplication factor of a energy meter? is there any other factor on which multification factor depend?
how we can decide that what value of ht line will come to any commercial building? (ans except According to the building load)
concept of busbar and load dispatching..?
State angle criterion.
I HAVE A 50A MCCB AS PER DESIGN LINE WIRE CONNECT UPWORD SIDE AND LOAD IS CONNECTED TO DOWNWARD SIDE TO THE MCCB.IF NOW ANY ONE CHANGE SUPPLY & LOAD(WISEVERSA) WHAT HAPPENS ? DOES MCCB OPERATION OR WORKING FUNCTION NORMAL IF YES THAN WHY THERE ARE MARKED LINE & LOAD ON MCCB.
Why in 6 KV XLPE cable termination kit used and why not in 380 V xlpe cable same is not used
What are unstable systems?
Why you are switching off arc protection mcb when you are taking shutdown for lv board.
Sir, I have applied for the of Jr.engineer(Electrical & Electronics) & ASST. LOCO PILOT at ALL RRB BOARDS. please send me all RRB Boards solved papers in the year of 2001 tO till date. i requested send me the papers to my id as soon as possible (jet_0991@yahoo.com). (This is very urgent) Thank You,
What are reasond for high wattage in single phase induction motors
why star point of HT motor not earthed?