{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9988-0AA23","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9988-0AA23","canonicalUrl":"https://aoctrl.com/siemens/3VA9988-0AA23","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9988-0AA23","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA9988-0AA23 leading auxiliary switch, changeover contacts type HQ (7 mm), electronic accessory for 3VA1 and 3VA20 up to 3VA25 circuit breakers, 0.3 A thermal current, 30 mm depth.","salesMarkdown":"The Siemens SENTRON 3VA9988-0AA23 is a leading auxiliary switch — a changeover switch with changeover contacts type HQ (7 mm) designed as an electronic accessory for 3VA1 and 3VA20 up to 3VA25 circuit breakers. It snaps onto the breaker's left side (leading position) to signal the main contact position to a PLC or indicator lamp. Rated thermal current is 0.3 A, with switching capacities defined per duty class: 0.3 A at AC-12 and AC-15 (12 V or 24 V), 0.1 A at DC-12 (12 V or 24 V), and 0.07 A at DC-13 (12 V or 24 V). ## Integration Notes The 7 mm width matches the modular width of a single 1-pole SENTRON 3VA breaker pole. It clips directly onto the breaker's left side; no additional DIN-rail space is consumed beyond the breaker's own footprint. Depth is 30 mm, height 56 mm — it stays within the breaker envelope, so panel layout and gland-plate clearance are unaffected. Strip length for the connecting wire is 15 mm (0.6 in). The 20 ms lead time (relating to main contacts) means the auxiliary contact follows the main contact within 20 ms — fast enough for most PLC scan cycles but not for safety-rated mirror contacts (those require < 5 ms). Minimum operating voltage is 24 V DC — below that the switch may not reliably change state. The thermal current of 0.3 A is the continuous carry limit; switching inductive loads (DC-13) should be kept to 0.07 A at 24 V to avoid contact erosion.","metaTitle":"3VA9988-0AA23 SENTRON Leading Auxiliary Switch, 0.3 A, 7 mm","metaDescription":"SENTRON 3VA9988-0AA23 leading auxiliary switch for 3VA1/3VA20-3VA25 breakers. 0.3 A thermal current, 7 mm width, 30 mm depth. Active production, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"30 mm","Width":"7 mm","Height":"56 mm","Maximum":"16","Minimum":"20","Accessories":"Leading auxiliary switch","Stripped Length":"15 mm","Thermal Current":"0.3 A","lifecycle_stage":"current","Product Brand Name":"SENTRON","at AC-12 / at 12 V":"0.3 A","at AC-12 / at 24 V":"0.3 A","at AC-15 / at 12 V":"0.3 A","at AC-15 / at 24 V":"0.3 A","at DC-12 / at 12 V":"0.1 A","at DC-12 / at 24 V":"0.1 A","at DC-13 / at 12 V":"0.07 A","at DC-13 / at 24 V":"0.07 A","Degree Of Pollution":"3","Product Designation":"Leading auxiliary switch","Overvoltage Category":"III","Stripped Length [In]":"0.6 in","Design Of The Product":"Accessories for 3VA circuit breakers","Surge Voltage Resistance":"4 kV","Lead Time / Relating To Main Contacts":"20 ms","operating voltage / at DC / rated value / minimum":"24 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$20.32","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/43e39e3ec9846d536898715acfe68004.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=192332&mlfb=3VA9988-0AA23","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9988-0AA23/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA9988-0AA23 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability."},{"question":"What is the depth of 3VA9988-0AA23?","answer":"The depth is 30 mm. Width is 7 mm, height is 56 mm."},{"question":"Will 3VA9988-0AA23 fit a panel designed for 5SY4140-7?","answer":"No — 5SY4140-7 is a miniature circuit breaker, not an auxiliary switch. The 3VA9988-0AA23 is a leading auxiliary switch that mounts on 3VA series breakers only. It will not drop into a panel wired for a 5SY4140-7 without rewiring and a different base breaker."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9988-0AA23","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3VA9988-0AA23 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}