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--- project:surge_protector [2025-12-28 Sun wk52 20:37] – [Photos] baumkp
+++ project:surge_protector [2025-12-29 Mon wk01 08:06] (current) – [Documentation] baumkp
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+{{tag>surge "surge protector" varsistor GDT MOV}}
 ======Surge Protector======
-I purchase a ARLEC Premium Surge Protector.  I Tore apart a unit to see what it was made of.
+I purchase [[https://www.arlec.com.au/products/arlec-white-1-outlet-premium-surge-adaptor|ARLEC Premium Surge Protectors]] from [[https://www.bunnings.com.au/arlec-1-outlet-premium-surge-adaptor_p0272229|Bunnings]] in Dec 2025 for $18.67 each (I got an additional 5% trade discount.).  I tore apart a unit to see what it was made of.  I was impressed with the construction and purchase a total of 6 units, including the tear down unit which I do not intent to bring back into service, plus a spare.  This allows a unit to be installed in each bedroom and study, which also aligns with the household general outlet power circuits. This is to protect the main expensive electronics from surge failure.
+My power meter indicated that the unit power consumption was 0.29W and 0.52VA, giving a power factor of about 0.6.  The meter accuracy at these lower power ranges is low, however the reading of 0.29W aligns with the power of the 2 operating green LEDs, with the bulk of the power loss across R1 the 100kOhm resistor feeding the LEDs.
 =====Circuit Diagram and BoM=====
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 ====Circuit Diagram====
+(Used [[https://www.kicad.org/|KiCAD]])
 {{.:pasted:20251228-125446.png}}
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 {{:project:img_6867.jpeg|}}
+====Documentation====
+  *TVS/GDT {{ :project:c2908086.pdf |}}  I am not sure if the this is the correct model/manufacturer, the part number ''SXH81-600X'' and dimensions 8mm diameter x 6mm long body as measured.
+  *The varsistor {{ :project:mov14d.pdf |}}  The manual part number aligns with the part ''MOV-14D471K''.  Interestingly the varsistor is rated at 125J each.  Not sure how the 1800J nameplate capacity is derived, presumably a combination of the varsistors and GDT in a certain operating mode.
+  *The surge protect aligns well with the design consideration given in {{ :project:ApplicationofGasDischargeTubesinPowerCircuits_en.pdf|Application of Gas Discharge Tubes in Power Circuits}}, see figure 9.
+  *[[https://forum.digikey.com/t/series-parallel-operation-of-movs/44366|Series & Parallel Operation of MOVs]]
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