Answer / vinod.c

MPCB is the Motor protected circuit Breaker.
OLR is the over load Relay

Answer / satish m

As mentioned in above answers the abbrivation is correct.
The main difference is MPCB is the combination of contactor
and OLR, it having in built OLR.

OLR- it is an element it is connected to the output of the
contactor to protect the motor.

Answer / sachin

MPCB is device which has inbuilt OLR+Short circuit
connected to Trip coil.
In event of fault like oveload OLR coil will sense and give
command to trip coil to trip.
In event of Short circuit fault SC coil will energise
inside MPCB and trip circuit breaker.

In case of OLR over load relay, its only a primary device
which senses only over loads.We need to connect contactor
to break the circuit.

Answer / vinod.c

MPCB is the Motor protected circuit Breaker.

Answer / nithyanandam

Mr. Vinoth everyone know that MPCB is Motor protection
circuit breaker and OLR is Over load relay.

What is the difference between them.

OLR break the circuit and MPCB also break the circuit.

Please tell me difference between these two things

Answer / murugesh

OLR is the relay which senses the overload current i.e more than 100% of the motor capcity, whereas MPCB breaks the circuit during shortcircuit i.e current in the range of 5 to 10 times the rated current.

Answer / nithyananthan

hi. the olr and mpcb both are the protecting devices. but
the olr senses the current of winding capacity. means the
maximum current which does not cause the winding
insulation.it always connected in the starter.

but the mpcb sense the over current by means of load. the
phase to phase short, and the dead short are sensed by the mpcb.

Answer / nithyanandam

Mr. Satish thank you for your answer.

In an Interview I'm also told the same answer. But the
Interviewer asked, "You are saying The difference with
cosidering the circuit connection only. Please tell me
difference with considering Over load current and short
circuit current. This is the major difference between them".

I'm really don't Know answer untill now. Please tell me the
answer immediately.

Answer / ravikumar

OLR - OVERLOAD RELAY
MPCB- MOTOR PROTECTION CIRCUIT BREAKER
IF SHORT CIRCUIT IS OCCURED IN CIRCUITS ,
OLR - MELT THE COIL TO TRIP AFTER ITS AUTOMATICALLY
CAME NORMAL POSITION BUT,
MPCB- TRIP THE COIL IT WILL BE MANUALLY SWITCH ON THE RUN
THIS IS THE DIFFERENCE

Answer / mohammed abdul naeem

1. MPCB is Trip by (Auxiliary Block Contact.)
2. OLR is Trip by Thermal (heating by range setting)

Why in Digital Megger for finding Insulation resistance,-ve is applied to core or conductor and +ve is applied to ground.

1 Answers   ACC,

Dear all i want to know SEWA Electrical Supervisor Licence test Previous Year Questions ? If any body know please send to me zohairaukllah@yahoo.com

0 Answers  

If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.

0 Answers   MEIL,

CAN ANY ONE EXPLAIN THE KNEE VOLTAGE OF THE CT?

3 Answers  

HOW CALCULATE MOTOR KW, IF MOTOR NAME PLATE MISSING, WE FIND ONLY MOTOR WINDING RESISTANCE ONLY

1 Answers  

Multimeter show phase to neutral volt 230 the per phase but phase to phase 415 not show 460 why.

1 Answers   Intas,

why firewall is build up between two transformer (220/11kv,50MVA)?what should be the firewall height?what is the clearance between firewall and transformer?

2 Answers   Siemens, Tous Stadt,

Draw an S.L.D of the main panel for a hospital, showing meter position. Essential loads are: 1) Equipment load 100 KW 2) Critical load 500 KW 3) Life AID Safety load 400 KW 4) NON-Essential load 200 KW 5) Other service loads 200 KW Calculate and suggest the size of the transformer, size of main cable, capacitor bank, and calculate the capacity of an emergency load having above first three mentioned loads is supplied by an emergency generator.

0 Answers   FEWA, HMK,

What is the formula to calculate distribution transformer De-rating on iron losses basis

0 Answers   IESCO,

What are the difference between CT/PT operated Meter and RRAMR Meter for HT/LT application?

0 Answers   ABC, ACB,

sail kaott diploma ece ke interviw me qus.kis parkar ke aate hai aur G.S me kya puchate hai kya sameedyaan me kis parkar ke qu.puchate hai

0 Answers   Sail,

Corona occurs between two transmission wires when they (a) are closely-spaced (b) are widely-spaced (c) have high potential difference (d) carry d.c. power

2 Answers   Power Grid,