Author Topic: GE meter relay  (Read 3872 times)

Gippslander

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GE meter relay
« on: July 17, 2016, 12:10:07 PM »
I picked this up at a Hamfest for 10 bucks . It might be a handy thing ..or not  ::)  Problem is it runs from 120V AC .

« Last Edit: July 17, 2016, 12:12:42 PM by Gippslander »
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Gippslander

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Re: GE meter relay
« Reply #1 on: July 19, 2016, 08:56:20 AM »
Been reading the manual on this. There are two light dependant transistors and a light inside the meter , the transistors are in series with the 120V AC relay coils in the control unit ( don't understand this because transistors need DC to operate ? Might be a bridge rectifier in there ) ) . The blue and red pointers allow light onto the transistors and switch them on or off as the case may be. The coil contacts will handle 5 Amps so can be used to switch other devices on/off

I am not sure about the 50 cycle side of things . There are two wire terminals on the back of the meter , I think this is where the 50 cycle is sampled . But how much 50 cycle Voltage is needed to deflect the pointer ?  Mike

The sticker on the meter says:

RTG  400 - 0 - 350 MV

Term.  RES, 1500 OHM
« Last Edit: July 19, 2016, 09:13:51 AM by Gippslander »
Gippsland is in the S.E. corner of mainland Australia

Samo

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Re: GE meter relay
« Reply #2 on: July 19, 2016, 12:05:42 PM »
Hi Gippslander,

The photo link doesn't work for me, which makes it difficult to understand what you've bought. Maybe others are having the same issue?

Samo
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Gippslander

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Re: GE meter relay
« Reply #3 on: July 19, 2016, 01:11:47 PM »
Oops

This pic may work . I think I need a 240 to 5 Volt step down transformer for the meter movement and a resistor across the meter terminals . The 400-0-350 ma refers to the meter movement ?

More info here maybe  http://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&uact=8&ved=0ahUKEwiul7HuwP_NAhUH1mMKHdvfAEoQFghIMAg&url=http%3A%2F%2Fwww.electricalpartmanuals.com%2Fpdf%2FrelaysAndMeters%2FGeneral%2520Electric%2FRelays%2F4556K52-001F.pdf&usg=AFQjCNGOC8V04dSaia8tstqBKffR6OXU0w

« Last Edit: July 19, 2016, 01:18:41 PM by Gippslander »
Gippsland is in the S.E. corner of mainland Australia

Thob

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Re: GE meter relay
« Reply #4 on: July 20, 2016, 12:45:47 AM »
Figure 2 on page 9 of the PDF shows 120V AC applied to terminals on the back of the control unit, which I believe mounts on the back of the meter.  I think the control unit is the black object in the box just below the meter in your photo.  Figure 12 on page 15 shows an internal schematic with a transformer, rectifiers, etc. to power the relay coils.
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Gippslander

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Re: GE meter relay
« Reply #5 on: July 20, 2016, 09:11:09 AM »
Looking at ebay, these meter relays are very expensive ..I wonder why ?  I paid 20 bucks
Gippsland is in the S.E. corner of mainland Australia