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Guardian X-300-ER Overload Relay




 
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Author Topic: Guardian X-300-ER Overload Relay  (Read 362 times)
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kc2we
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« on: March 28, 2018, 04:47:16 PM »

Does anyone have a data wiring sheet for the guardian E-300-ER overload relay?  It has a 250-750 ma trip coil and
a 6.3 V reset. Not quite sure how to attach the DC load to the trip coil. there's a WW pot across the trip coil. Seth KC2WE
kc2we (at) arrl dot net


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Seth Taylor
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Patrick J. / KD5OEI
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« Reply #1 on: March 29, 2018, 06:49:02 PM »

I have something like this in a transmitter. Same brand, maybe the same model. It works perfectly. The screen current from the screen voltage supply (-) side passes through the trip coil to GND, which keeps high voltages off the coil.

The pot, connected as a rheostat, reduces the sensitivity (increases trip current) as its resistance is lowered. Mine's set to 160mA to protect a 4-1000 screen. The schematic of that part of the transmitter is shown. One sets the trip point rheostat by attaching a load that draws a known current and turning the pot until it trips.

The latching relay is shown in the 'tripped' or unlatched position.


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kc2we
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« Reply #2 on: March 30, 2018, 08:47:11 PM »

Tnx for the details. I'll use it on my next tube project. Seth KC2WE
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Seth Taylor
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