{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9988-0AA21","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9988-0AA21","canonicalUrl":"https://aoctrl.com/siemens/3VA9988-0AA21","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9988-0AA21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, Leading auxiliary switch for 3VA circuit breakers, 3VA9988-0AA21, 10 A thermal current, AC-15 6 A at 24 V, DC-13 3 A at 24 V.","salesMarkdown":"The Siemens 3VA9988-0AA21 is a SENTRON leading auxiliary switch designed as an accessory for the 3VA family of molded-case circuit breakers. It signals the breaker's open/closed position to a control system or indicator circuit — a standard requirement for remote monitoring and interlocking in distribution panels. Rated thermal current (Ith) is 10 A, which defines the continuous current-carrying capacity through the switch contacts. For AC control circuits, the AC-15 rating (6 A at 24 V, 6 A at 125 V, 2 A at 400 V) covers solenoid and contactor coil loads — the typical application for an auxiliary switch in a motor control center. For DC circuits, the DC-13 rating (3 A at 24 V, 0.2 A at 110 V) covers switching inductive loads like DC contactors and relays. That is the standard rating for a breaker accessory mounted in a main distribution board or motor control center. Physical footprint is 14 mm wide, 56 mm high, 30 mm deep — a single-module width that clips directly onto the 3VA breaker's side. Stripped length of 15 mm (0.6 in) matches standard ferrule or bootlace-ferrule preparation for the screw-clamp terminals. No DIN-rail space consumed; the switch mounts on the breaker itself.","metaTitle":"Siemens 3VA9988-0AA21 SENTRON Leading Auxiliary Switch, 10 A","metaDescription":"Siemens 3VA9988-0AA21 SENTRON leading auxiliary switch for 3VA breakers. 10 A thermal current, AC-15 6 A, DC-13 3 A. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"30 mm","Width":"14 mm","Height":"56 mm","Maximum":"14","Minimum":"19","Accessories":"Leading auxiliary switch","Stripped Length":"15 mm","Thermal Current":"10 A","lifecycle_stage":"current","Product Brand Name":"SENTRON","at AC-12 / at 12 V":"10 A","at AC-12 / at 24 V":"10 A","at AC-12 / at 48 V":"10 A","at AC-15 / at 12 V":"6 A","at AC-15 / at 24 V":"6 A","at AC-15 / at 48 V":"6 A","at DC-12 / at 12 V":"6 A","at DC-12 / at 24 V":"6 A","at DC-12 / at 48 V":"2 A","at DC-13 / at 12 V":"3 A","at DC-13 / at 24 V":"3 A","at DC-13 / at 48 V":"0.8 A","Degree Of Pollution":"3","Product Designation":"Leading auxiliary switch","at AC-12 / at 125 V":"10 A","at AC-12 / at 400 V":"6 A","at AC-12 / at 600 V":"2 A","at AC-15 / at 125 V":"6 A","at AC-15 / at 600 V":"0.6 A","at DC-12 / at 110 V":"0.6 A","at DC-12 / at 250 V":"0.3 A","at DC-13 / at 110 V":"0.2 A","at DC-13 / at 250 V":"0.1 A","Overvoltage Category":"III","Stripped Length [In]":"0.6 in","Design Of The Product":"Accessories for 3VA circuit breakers","at AC-12 / at 220/240 V":"10 A","at AC-12 / at 380/400 V":"6 A","at AC-15 / at 220/240 V":"6 A","at AC-15 / at 380/400 V":"2 A","Surge Voltage Resistance":"6 kV","Lead Time / Relating To Main Contacts":"20 ms","operating voltage / at DC / rated value / minimum":"250 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$20.32","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/17c84085a799964f44e0eb46e69250e4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=525197&mlfb=3VA9988-0AA21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9988-0AA21/alternatives.json"},"ai":{"faq":[{"question":"What is 3VA9988-0AA21 used for?","answer":"It is a leading auxiliary switch that mounts on Siemens 3VA molded-case circuit breakers to indicate the breaker's open/closed state to a PLC, indicator light, or interlocking circuit."},{"question":"What are the key ratings of 3VA9988-0AA21?","answer":"Thermal current 10 A, AC-15 rating 6 A at 24 V (solenoid/coil loads), DC-13 rating 3 A at 24 V (inductive DC loads). Pollution degree 3, overvoltage category III."},{"question":"Where can I buy 3VA9988-0AA21?","answer":"This part is sourced to order through independent distribution channels. Submit an RFQ with your quantity and target delivery window; availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9988-0AA21","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/3VA9988-0AA21 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}}