{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0AA13","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0AA13","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0AA13","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0AA13","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON auxiliary switch, changeover contacts type HQ (7 mm), accessory for 3VA4/5/6 circuit breakers, 0.3 A thermal current, pollution degree 3, overvoltage category III.","salesMarkdown":"The Siemens 3VA9978-0AA13 is a SENTRON auxiliary switch — a changeover-contact accessory (type HQ, 7 mm width) designed to snap into 3VA4, 3VA5, and 3VA6 molded-case circuit breakers. It signals breaker position (open/closed/tripped) back to a PLC or status lamp without running separate wires into the breaker arc chamber. The thermal current (Ith) is 0.3 A — that's the continuous carry capacity through the switch contacts in free air. For switching duty, the part is rated per IEC 60947-5-1: at AC-15 (solenoid/contactor loads) it handles 0.3 A at both 12 V and 24 V; at DC-13 (inductive DC loads like relay coils) it drops to 0.07 A at 24 V. The minimum DC operating voltage is 24 V, so the switch is specified for standard 24 VDC control loops but not for lower-voltage logic (e.g. 5 V or 12 V TTL). Surge voltage resistance is 4 kV, matching the impulse-withstand level expected on 230/400 V distribution panels.","metaTitle":"Siemens 3VA9978-0AA13 SENTRON Auxiliary Switch, 0.3 A","metaDescription":"Siemens 3VA9978-0AA13 SENTRON auxiliary switch with changeover contacts for 3VA4/5/6 breakers. Rated 0.3 A AC-15/DC-13, 24 V min DC. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"title":"3VA9978-0AA13","Maximum":"16","Minimum":"20","Accessories":"Auxiliary switch","description":"auxiliary switch changeover contacts type HQ (7mm) electronic-comp. accessory for: 3VA4/5/6","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":"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","operating voltage / at DC / rated value / minimum":"24 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$17.78","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5979a693930e28f42c74d6a86d57e18f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650504&mlfb=3VA9978-0AA13"},"ai":{"faq":[{"question":"What is the switching capacity of 3VA9978-0AA13 on a 24 VDC inductive load?","answer":"At DC-13 (inductive) and 24 V, the rated current is 0.07 A. For resistive DC loads (DC-12) at 24 V, it's 0.1 A."},{"question":"Where can I buy 3VA9978-0AA13?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What breakers does the 3VA9978-0AA13 fit?","answer":"It is an accessory for Siemens 3VA4, 3VA5, and 3VA6 molded-case circuit breakers, using changeover contacts type HQ with 7 mm width."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0AA13","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/3VA9978-0AA13 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}