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sampath.j
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Join Date: Mar 2011
Posts: 2

Overload Relays

03/14/2011 8:30 AM

Dear All,

I want know how overload relays r working and how many types are there????
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kvsridhar
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India - Member - New Member

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2744
Good Answers: 164
#1

Re: Overload Relays

03/14/2011 8:58 AM

As far as i know...

1. Thermal overload relays based on (a) thermostatic bimetals and (b) eutectic solder (US usage, now obsolete i expect)

2. Magnetic overload relays, with the inverse time characteristic being provided by viscous damping by oil in a dashpot

3. Electronic relays, with many levels of sophistication, from simple analog to microprocessor-based ones.

4. A special type, thermistor relays, are used to protect equipment, mainly motors, against excess heat. Not current dependent.

How each works is rather complex, and will take considerable time and effort ... not easy in this forum.

Hope this helps.

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sampath.j
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Join Date: Mar 2011
Posts: 2
#2
In reply to #1

Re: Overload Relays

03/18/2011 1:43 AM

thanks for u nice explanation.........
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