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project:surge_protector [2025-12-28 Sun wk52 21:38] – [Documentation] baumkpproject:surge_protector [2025-12-29 Mon wk01 08:06] (current) – [Documentation] baumkp
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 {{tag>surge "surge protector" varsistor GDT MOV}} {{tag>surge "surge protector" varsistor GDT MOV}}
 ======Surge Protector====== ======Surge Protector======
-I purchase ARLEC Premium Surge Protectors from Bunning 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.+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. 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.
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 ====Circuit Diagram==== ====Circuit Diagram====
 +(Used [[https://www.kicad.org/|KiCAD]])
 {{.:pasted:20251228-125446.png}} {{.:pasted:20251228-125446.png}}
  
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 ====Documentation==== ====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.   *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''+  *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.   *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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