{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9977-0KB00","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9977-0KB00","canonicalUrl":"https://aoctrl.com/siemens/3VA9977-0KB00","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9977-0KB00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA9977-0KB00 position signaling switch, accessory for plug-in/draw-out units, 8.5 mm width, 33 mm depth, 6 A rated at AC-12/DC-12.","salesMarkdown":"The Siemens SENTRON 3VA9977-0KB00 is a position signaling switch accessory designed specifically for the plug-in and draw-out units of the 3VA molded-case circuit breaker family. It mounts directly onto the breaker's mechanism to indicate whether the breaker is in the connected, test, or disconnected position — a signal the control system needs for interlocking or status monitoring. The switch is 8.5 mm wide and 33 mm deep, sized to tuck alongside the breaker without expanding the panel footprint beyond the existing DIN-rail layout. ## Switching capacity by voltage — what the ratings mean Rated at 6 A for AC-12 duty (resistive loads) across 12 V to 230 V, and the same 6 A for DC-12 at 12 V. That DC rating drops to 3 A at 24 V, 1 A at 48 V, 0.5 A at 110 V, and 0.25 A at 230 V — standard derating for DC arcs. The thermal current limit Ith is 6 A, so the contacts are sized for continuous current at that level. For a control engineer, the practical takeaway: this switch handles typical 24 VDC PLC input signals (3 A) without issue, but if you need to switch a 48 VDC solenoid at 1.5 A, you're above the rating and need a relay interposer. ## Voltage isolation and environment That means it's suitable for fixed-installation panels in industrial environments where transient surges are common and conductive dust or humidity is present.","metaTitle":"Siemens 3VA9977-0KB00 Position Signaling Switch, 8.5 mm wide","metaDescription":"Siemens SENTRON 3VA9977-0KB00 position signaling switch accessory for 3VA plug-in/draw-out units. Active lifecycle. Rated 6 A AC-12/DC-12 at 24 V. Compact 8.5 mm width. Available t","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"33 mm","Width":"8.5 mm","Height":"43 mm","Maximum":"16","Minimum":"20","Accessories":"Position signaling switch","Product version":"Accessories plug-in/draw-out unit","lifecycle_stage":"current","Product brand name":"SENTRON","at AC-12 / at 12 V":"6 A","at AC-12 / at 24 V":"6 A","at AC-12 / at 48 V":"6 A","at DC-12 / at 12 V":"6 A","at DC-12 / at 24 V":"3 A","at DC-12 / at 48 V":"1 A","Degree of pollution":"3","Product designation":"Position signaling switch","at AC-12 / at 110 V":"6 A","at AC-12 / at 230 V":"6 A","at DC-12 / at 110 V":"0.5 A","at DC-12 / at 230 V":"0.25 A","Overvoltage category":"III","Wire stripping length":"15 mm","Thermal current limit Ith":"6 A","Wire stripping length [in]":"0.6 in","Rated insulation voltage Ui":"240 V","Rated impulse withstand voltage":"4 kV","Rated operational voltage Ue with DC":"250 V","Rated operational voltage Ue at AC 50 Hz":"240 V","Operating voltage / at AC / acc. to CSA and UL":"240 V","Operating voltage / at DC / acc. to CSA and UL":"250 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650490&mlfb=3VA9977-0KB00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9977-0KB00/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA9977-0KB00 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the width and depth of 3VA9977-0KB00?","answer":"Width is 8.5 mm, depth is 33 mm, height is 43 mm — compact enough to mount alongside a 3VA breaker without requiring additional DIN-rail space."},{"question":"What compliance documentation is available for 3VA9977-0KB00?","answer":"The part carries the Siemens SENTRON brand and is designed for overvoltage category III, pollution degree 3 environments. Standard manufacturer documentation (declaration of conformity, CE marking) applies; specific RoHS/REACH/UL documentation should be requested at quote time from the distributor."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9977-0KB00","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/3VA9977-0KB00 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}}