{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2921-1M","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2921-1M","canonicalUrl":"https://aoctrl.com/siemens/3RV2921-1M","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2921-1M","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS signaling switch, 3RV2921-1M, separate tripped signal and short circuit alarm, 1 NO + 1 NC each, screw-type terminals, plug-in fixing for 3RV2 breakers sizes S00, S0, S2, S3.","salesMarkdown":"The Siemens SIRIUS 3RV2921-1M is a signaling switch designed as a direct accessory for 3RV2 motor starter protectors and circuit breakers. It provides separate tripped signal and short circuit alarm contacts, each configured as 1 NO + 1 NC, giving the panel builder two independent status feedback paths from the breaker. The 3RV2921-1M plugs directly onto the front of 3RV2 breakers in frame sizes S00, S0, S2, and S3. It mounts via plug-in fixing onto the breaker itself. Contact ratings are voltage-dependent. The AC-12 maximum of 10 A (resistive load) is the thermal limit; the real-world signal load is usually lower. At 230 V the switch handles 4 A, at 400 V it's 3 A, and at 690 V it's 10 A — the 690 V figure is the highest voltage class for this auxiliary contact block, so it can be used in 690 V line-to-line control circuits common in European industrial panels. For inductive loads (AC-15 duty, typical for contactor coils), the rating drops to 1 A at 690 V. That means a single 3RV2921-1M can drive one large contactor coil at 690 V, but not two in parallel — the 1 A limit governs the inductive switching life. Screw-type terminals accept 0.5 to 2.5 mm² solid or stranded, or 2 x (0.5 to 1.5 mm²) and 2 x (0.75 to 2.5 mm²) for looping through. AWG 18 to 14 for the auxiliary circuit. The 18 mm width matches the standard 3RV2 breaker profile — no overhang on the side.","metaTitle":"Siemens 3RV2921-1M SIRIUS Signaling Switch, 1 NO + 1 NC","metaDescription":"Siemens SIRIUS 3RV2921-1M signaling switch for 3RV2 breakers. Active production. Screw terminals, plug-in mount. Rated 10 A AC-12, 1 A AC-15 at 690 V. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"68 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"18 mm","title":"3RV2921-1M","Height":"90 mm","at 24 V":"2 A","at 110 V":"0.5 A","at 220 V":"0.25 A","at 230 V":"4 A","at 250 V":"0.25 A","at 400 V":"3 A","at 690 V":"10 A","description":"signaling switch for circuit breaker 3RV2 with screw terminal","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","Fastening Method":"plug-in fixing","Solid Or Stranded":"0.5 ... 2.5 mm²","Product Brand Name":"SIRIUS","Product Designation":"signaling switch","Design Of The Product":"separate tripped signal and short circuit alarm, 1 NO + 1 NC each","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Substance Prohibitance (Date)":"10/01/2009","at AWG cables for auxiliary contacts":"2x (18 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","operational current at AC-15 at 690 V rated value":"1 A","operational current of auxiliary contacts at AC-12 maximum":"10 A","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","number of CO contacts of auxiliary contacts instantaneous contact":"0","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","AWG number as coded connectable conductor cross section for auxiliary contacts":"18 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$44.87 – $62.36","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ea2e43d47a1f4067f046a72bc012d911.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=411396&mlfb=3RV2921-1M"},"ai":{"faq":[{"question":"What is 3RV2921-1M's depth?","answer":"The depth is 68 mm, with a width of 18 mm and height of 90 mm."},{"question":"What wire sizes does the 3RV2921-1M accept?","answer":"Screw terminals accept 0.5 to 2.5 mm² solid or stranded, or 2 x (0.5 to 1.5 mm²) and 2 x (0.75 to 2.5 mm²) for daisy-chaining. AWG 18 to 14 for auxiliary contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2921-1M","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/3RV2921-1M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}