{"product_id":"allen-bradley-9902a1-voltage-monitor-card-9902a1","title":"Allen-Bradley 9902A1 Voltage Monitor Card 9902A1","description":"\u003cdiv class=\"\" data-turn-id-container=\"request-6a64713e-98ec-83ec-89dd-1036978169ba-14\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a64713e-98ec-83ec-89dd-1036978169ba-14\" data-turn-id-container=\"request-6a64713e-98ec-83ec-89dd-1036978169ba-14\" data-testid=\"conversation-turn-64\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-15 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"9dfeb5db-9c37-4607-b06d-791bcc095bae\" data-turn-start-message=\"true\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\"\u003e\n\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\"\u003eDescription:\u003c\/h3\u003e\n\u003cp data-start=\"18\" data-end=\"902\"\u003eThe Card 9902A1 Voltage Monitor Card 9902 is used in industrial control systems to monitor incoming supply voltage and provide protective signaling for power supervision and equipment operation. Commonly installed in \u003ca href=\"https:\/\/plgautomation.com\/collections\/plcs-more\"\u003ePLC\u003c\/a\u003e systems, industrial control panels, power distribution equipment, and machine automation systems where continuous voltage monitoring is required to detect undervoltage, overvoltage, or power loss conditions. Maintenance teams, OEMs, and \u003ca href=\"https:\/\/plgautomation.com\/collections\/hmi-operator-interfaces\"\u003esystem integrators\u003c\/a\u003e use this voltage monitor card for replacement of failed monitoring boards, preventive maintenance, restoration of power monitoring functions, and industrial control system repairs. Publicly available documentation for this legacy card is limited, so specifications below are based on typical industrial voltage monitor card applications rather than a manufacturer datasheet. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"904\" data-end=\"921\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"923\" data-end=\"1341\"\u003eThe Card 9902A1 Voltage Monitor Card 9902 is designed to supervise electrical supply voltage and provide status feedback to industrial automation systems. It is commonly used in manufacturing facilities, process control systems, motor control centers, utility equipment, and OEM machinery where reliable voltage monitoring helps protect electrical equipment and maintain system uptime. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1343\" data-end=\"1372\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1374\" data-end=\"2064\"\u003e• Manufacturer Part Number (MPN): 9902A1\u003cbr data-start=\"1414\" data-end=\"1417\"\u003e• Model: 9902\u003cbr data-start=\"1430\" data-end=\"1433\"\u003e• Product Type: Voltage Monitor Card\u003cbr data-start=\"1469\" data-end=\"1472\"\u003e• Function: AC\/DC supply voltage monitoring and protective status indication\u003cbr data-start=\"1548\" data-end=\"1551\"\u003e• Monitoring Type: Overvoltage, undervoltage, and power loss detection (application dependent)\u003cbr data-start=\"1645\" data-end=\"1648\"\u003e• Installation: Rack-mounted or control panel module (system dependent)\u003cbr data-start=\"1719\" data-end=\"1722\"\u003e• Interface: Industrial control system backplane connection\u003cbr data-start=\"1781\" data-end=\"1784\"\u003e• Application: Power monitoring and equipment protection\u003cbr data-start=\"1840\" data-end=\"1843\"\u003e• Compatible Equipment: Legacy industrial control and automation systems using the 9902 platform\u003cbr data-start=\"1939\" data-end=\"1942\"\u003e• Mounting: Plug-in circuit card\u003cbr data-start=\"1974\" data-end=\"1977\"\u003e• Status: Legacy industrial replacement component \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"2066\" data-end=\"2090\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"2092\" data-end=\"2185\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e• 9902A2 Voltage Monitor Card\u003cbr data-start=\"2121\" data-end=\"2124\"\u003e• 9902A3 Voltage Monitor Card\u003cbr data-start=\"2153\" data-end=\"2156\"\u003e• 9902B1 Voltage Monitor Card\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"PLG Automation ","offers":[{"title":"New","offer_id":51727302852910,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_0ace8102-0c62-4171-b225-578649a53d7f.jpg?v=1770582387","url":"https:\/\/plgautomation.com\/products\/allen-bradley-9902a1-voltage-monitor-card-9902a1","provider":"PLG Automation ","version":"1.0","type":"link"}