{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0AB13","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0AB13","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0AB13","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0AB13","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, tripped signaling switch (changeover contacts), 1 slot (7 mm), 0.3 A thermal current, for 3VA4/5/6 breakers, order code 3VA9978-0AB13.","salesMarkdown":"The Siemens 3VA9978-0AB13 is a tripped signaling switch — a changeover-contact module that snaps into the right-side accessory slot of a 3VA4, 3VA5, or 3VA6 molded-case circuit breaker. When the breaker trips on overload or short circuit, this switch changes state and sends a signal back to a PLC, alarm lamp, or SCADA input. It takes up one slot, 7 mm wide, on the breaker's side panel. The switch contacts are rated for 0.3 A thermal current; at AC-15 or AC-12 duty on 24 V it switches 0.3 A, and at DC-13 on 24 V it handles 0.07 A — enough to drive a small relay or a PLC digital input, not a motor contactor directly. ## Mounting and wiring note The switch clips into the accessory compartment on the right side of the 3VA breaker frame — no tools needed, no DIN-rail space consumed. It connects via the breaker's internal bus, so no separate power supply is required for the switch itself. The changeover contacts are brought out to screw terminals; strip 15 mm (0.6 in) of wire. The switch occupies one modular slot (7 mm), leaving adjacent slots free for other accessories like shunt trips or undervoltage releases. If the breaker is already in the panel, you can install this accessory without removing the breaker from the DIN rail or the mounting plate.","metaTitle":"Siemens 3VA9978-0AB13 SENTRON Tripped Signaling Switch, 0.3","metaDescription":"Siemens 3VA9978-0AB13 SENTRON tripped signaling switch for 3VA4/5/6 breakers. 0.3 A thermal current, 690 V insulation, 1 slot (7 mm). Active production, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"title":"3VA9978-0AB13","Maximum":"16","Minimum":"20","Accessories":"Tripped signaling switch","description":"trip alarm switch changeover contacts type HQ (7mm) electronic-comp. accessory for: 3VA4/5/6","Width / Note":"1 slot (7 mm)","Product version":"Accessories for 3VA circuit breakers","Stripped Length":"15 mm","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":"Tripped signaling switch","Overvoltage category":"III","Stripped Length [In]":"0.6 in","Thermal current limit Ith":"0.3 A","Tension assignée d'isolement Ui":"690 V","Rated operational voltage Ue with DC":"24 V","Tension assignée de tenue aux chocs":"4 kV","Rated operational voltage Ue at AC 50 Hz":"24 V","operating voltage / at AC / acc. to CSA and UL":"24 V","operating voltage / at DC / acc. to CSA and UL":"24 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/92003645c9df5325cc1e452e51f707d7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650510&mlfb=3VA9978-0AB13"},"ai":{"faq":[{"question":"What is the 3VA9978-0AB13 used for?","answer":"It's a tripped signaling switch for Siemens 3VA4, 3VA5, and 3VA6 molded-case circuit breakers. When the breaker trips, the switch's changeover contacts close or open to send a remote alarm to a PLC, indicator lamp, or SCADA system. It occupies one 7 mm slot on the breaker's side."},{"question":"What are the key electrical ratings of the 3VA9978-0AB13?","answer":"Thermal current Ith is 0.3 A. At AC-15 or AC-12 on 24 V it switches 0.3 A; at DC-13 on 24 V it switches 0.07 A. Rated insulation voltage is 690 V with a 4 kV impulse withstand. Pollution degree 3, overvoltage category III."},{"question":"Where can I buy the 3VA9978-0AB13 and get a price?","answer":"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":"Will the 3VA9978-0AB13 fit a 3VA2 or 3VA1 breaker?","answer":"The evidence specifies it's designed for 3VA4, 3VA5, and 3VA6 breakers. It will not mechanically or electrically fit 3VA2 or 3VA1 frames — those use different accessory slots."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0AB13","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/3VA9978-0AB13 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}}