{"id":5366,"date":"2021-04-24T14:32:40","date_gmt":"2021-04-24T19:32:40","guid":{"rendered":"https:\/\/www.summet.com\/blog\/?p=5366"},"modified":"2021-04-24T20:15:00","modified_gmt":"2021-04-25T01:15:00","slug":"replacement-teardown-of-intermatic-ag3000-surge-protective-device","status":"publish","type":"post","link":"https:\/\/www.summet.com\/blog\/2021\/04\/24\/replacement-teardown-of-intermatic-ag3000-surge-protective-device\/","title":{"rendered":"Replacement \/ Teardown of Intermatic AG3000 Surge Protective Device"},"content":{"rendered":"<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/YAosRN7Pans\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>The Intermatic AG3000 Surge Arrestor \/ Surge Suppressor device wired into my main breaker panel had a green indicator light that indicates correct operation. But the green light disappeared, indicating that the device was no longer providing protection, so I replaced it.<\/p>\n<p>Afterwards, I opened up the failed device to see if there was any evidence of a surge (all the electronics in my house still appeared to be working) and to see what was inside it.<\/p>\n<p><a href=\"https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-5367\" src=\"https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-1024x576.jpg\" alt=\"\" width=\"584\" height=\"329\" srcset=\"https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-1024x576.jpg 1024w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-300x169.jpg 300w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-768x432.jpg 768w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-1536x864.jpg 1536w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-2048x1152.jpg 2048w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/interior_components-500x281.jpg 500w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/a><br \/>\nThe surge suppression functionality is provided entirely by a pair of Mersen 150TPMOVSL (150 volt thermally protected MOV with &#8220;short leads&#8221; for the internal micro-switch) They are in series between the two 240v hot leads, with the neutral lead in the middle. (You can also use this device on a 120v circuit by connecting both black wires to the single live\/hot wire, putting both MOV&#8217;s in parallel).<\/p>\n<p>The microswitches are normally open, and the spec sheet says they close when the metal oxide disk inside fails. [This particular model does not include a visual pop-out indicator.] \u00a0 The indicator circuit board (normally soldered to the top of the MOV&#8217;s) is extremely simple, and is powered from neutral and one of the hot lines (120v AC) via two large ohm value resistors (I measured 63 VAC after the resistors) through a single diode. \u00a0 The microswitches are placed in parallel to the indicator light (which may be a LED of some type, it used a LED symbol next to a 93V-0 marking on the PCB) so that they short it out if they close.<\/p>\n<p><a href=\"https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-5368\" src=\"https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-1024x576.jpg\" alt=\"\" width=\"584\" height=\"329\" srcset=\"https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-1024x576.jpg 1024w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-300x169.jpg 300w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-768x432.jpg 768w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-1536x864.jpg 1536w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-2048x1151.jpg 2048w, https:\/\/www.summet.com\/blog\/wp-content\/uploads\/2021\/04\/indicator_circuit-500x281.jpg 500w\" sizes=\"auto, (max-width: 584px) 100vw, 584px\" \/><\/a><\/p>\n<p>Once I removed the indicator circuit board, the MOV micro-switches were open (non-conducting), so it is possible that the indicator light failed shorted and the MOV&#8217;s are still providing proper protection.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Intermatic AG3000 Surge Arrestor \/ Surge Suppressor device wired into my main breaker panel had a green indicator light that indicates correct operation. But the green light disappeared, indicating that the device was no longer providing protection, so I &hellip; <a href=\"https:\/\/www.summet.com\/blog\/2021\/04\/24\/replacement-teardown-of-intermatic-ag3000-surge-protective-device\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,6],"tags":[],"class_list":["post-5366","post","type-post","status-publish","format-standard","hentry","category-commentary","category-reviews"],"_links":{"self":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/5366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/comments?post=5366"}],"version-history":[{"count":2,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/5366\/revisions"}],"predecessor-version":[{"id":5371,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/posts\/5366\/revisions\/5371"}],"wp:attachment":[{"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/media?parent=5366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/categories?post=5366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.summet.com\/blog\/wp-json\/wp\/v2\/tags?post=5366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}