HOW DO I CALCULATE OVER LOAD RELAY & CONTACTOR IN DOL
STARTER?
& in dol why it is require circuit breaker?
Answers were Sorted based on User's Feedback
Answer / x man
for OLR---It has to be Motor full oad current
for Contactor--it has to be 1.5 timmes the motor rated
current.
Circui breaker is used to protect the circuit.
for A tYPR 2 cordination these three componenrs are needed
in the circuits
Is This Answer Correct ? | 13 Yes | 6 No |
Answer / ermias solomon
in OLrelay 115%*motor name plate current
for contactor use
NEMA table by ermias solomon
Is This Answer Correct ? | 1 Yes | 1 No |
Answer / christopher pino
Refer to NFPA 70 - NEC 2005 (Article: Motor Protection) for
sizing and other consideration.
Is This Answer Correct ? | 1 Yes | 3 No |
Answer / barkha
In case of DOL Starter overload relay range depend on full
load current(flc) of the motor it is 2-3 times of flc &
also keep in mind the fuse rating of the motor
Is This Answer Correct ? | 11 Yes | 15 No |
Answer / nikhil chugh
THE CONTACTOR RATING SHOULD BE 3.5 TIMES GREATER THEN THE
MOTOR CURRENT RATING FOR SMOOTH RUNNING OF THE MOTOR WITH
PANEL
Is This Answer Correct ? | 1 Yes | 5 No |
Answer / k.suresh
motor full load ampes & 6 time higher select OLR AND
Contactor.
Is This Answer Correct ? | 11 Yes | 27 No |
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