{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1912-1CV1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1912-1CV1","canonicalUrl":"https://aoctrl.com/siemens/3RV1912-1CV1","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1912-1CV1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS undervoltage release, 415 V AC/50 Hz, 480 V AC/60 Hz, with 2 NO leading auxiliary switch, snap-on mounting for 3RV10 circuit breakers sizes S00, S0, S2, S3.","salesMarkdown":"The Siemens 3RV1912-1CV1 is a SIRIUS undervoltage release designed to drop a 3RV10 motor circuit breaker when the control voltage falls below its holding threshold. It carries 2 NO leading auxiliary contacts that change state ahead of the main breaker contacts, giving the PLC or safety relay a status signal before the power circuit opens. That leading-contact timing matters when you need to sequence a downstream drive stop or confirm the drop-out before a restart. At 18.5 mm wide and 68 mm deep, it tucks into the same rail footprint as the breaker it serves — no extra panel real estate needed. ## Breaker compatibility and panel fit Listed for 3RV10 circuit breakers in frame sizes S00, S0, S2, and S3. It clips onto the left side of the breaker without tools. The 18.5 mm width matches the accessory slot on those breakers — it does not add a full module width to the rail. Depth of 68 mm is shallower than the breaker body (75 mm on S00 frames), so it stays inside the gland-plate clearance envelope. Rated insulation voltage 690 V AC, pollution degree 3. Front face is IP20 finger-safe — acceptable for open-panel installation. If your control transformer taps 400 V at 50 Hz, the release still holds in — the dropout threshold is a percentage of rated voltage, typically 70–35 % of Ue. At 400 V the coil sees about 96 % of its 415 V rating, well above the dropout zone.","metaTitle":"Siemens 3RV1912-1CV1 SIRIUS Undervoltage Release, 415 V AC /","metaDescription":"Siemens 3RV1912-1CV1 SIRIUS undervoltage release for 3RV10 motor circuit breakers. 415 V AC at 50 Hz, 480 V AC at 60 Hz coil. 2 NO leading aux contacts. Snap-on DIN rail. Active pr","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"68 mm","Width":"18.5 mm","Height":"90 mm","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","Fastening Method":"snap-on mounting","Final Rated Value":"60 Hz","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Initial Rated Value":"50 Hz","Product Designation":"undervoltage release","Suitability For Use":"motor circuit breaker","at 50 Hz rated value":"415 V","at 60 Hz rated value":"480 V","Design Of The Product":"with 2 auxiliary contacts","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Insulation Voltage Rated Value":"690 V","Design Of Short-Circuit Protection":"fuse","reference code acc. to DIN EN 61346-2":"F","Type Of Voltage Of The Control Supply Voltage":"AC","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","protection class IP on the front acc. to IEC 60529":"IP20","number of NO contacts for auxiliary contacts leading contact":"2","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0"}},"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=101620&mlfb=3RV1912-1CV1","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1912-1CV1/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV1912-1CV1 drop into a panel built around 3RV1011-0GA10?","answer":"Yes. The 3RV1912-1CV1 is the undervoltage release accessory for the 3RV10 breaker family, which includes the 3RV1011-0GA10. It snaps onto the left side of that breaker without rewiring the power circuit. The 18.5 mm width and 68 mm depth fit within the same DIN-rail envelope."},{"question":"What are the key dimensions of 3RV1912-1CV1?","answer":"Width 18.5 mm, depth 68 mm, height 90 mm. The narrow width matches the accessory slot on SIRIUS 3RV10 breakers — it does not add a full module pitch to the DIN rail."},{"question":"What compliance documentation does Siemens provide for 3RV1912-1CV1?","answer":"The part carries IEC ratings (insulation voltage 690 V, pollution degree 3, IP20 front protection). Siemens typically provides CE declaration of conformity and RoHS/REACH substance compliance on request through the standard documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1912-1CV1","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/3RV1912-1CV1 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}}