{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2921-2M","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2921-2M","canonicalUrl":"https://aoctrl.com/siemens/3RV2921-2M","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2921-2M","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS signaling switch, 3RV2921-2M, separate tripped signal and short-circuit alarm, 1 NO + 1 NC, spring-loaded terminals, for 3RV2 breakers sizes S00/S0/S2/S3.","salesMarkdown":"The Siemens SIRIUS 3RV2921-2M is a signaling switch designed as a bolt-on accessory for 3RV2 motor-protective circuit breakers. It provides a separate tripped signal and short-circuit alarm through one NO and one NC instantaneous contact each, giving the panel a clean way to distinguish a thermal overload trip from a short-circuit event without adding a separate monitoring relay. Mounts via plug-in fixing directly onto 3RV2 breakers in frame sizes S00, S0, S2, and S3 — no DIN rail space consumed beyond the breaker itself. Spring-loaded terminals accept 0.5 to 2.5 mm² solid or stranded, or 2x (0.5 to 1.5 mm²) with ferruled ends. The 18 mm width keeps the assembly tight on the rail. Contact ratings span the control-voltage range you'd expect on a motor branch: 2 A at 24 V, 0.5 A at 110 V, 0.25 A at 220/250 V, 4 A at 230 V, 3 A at 400 V, and 10 A at 690 V. The AC-12 maximum rating of 10 A covers resistive loads on the auxiliary circuit. These are the values that govern whether the signaling switch can handle the PLC input or indicator lamp load on your specific control voltage. RoHS compliance date of October 1, 2009, covers EU substance restrictions.","metaTitle":"Siemens 3RV2921-2M SIRIUS Signaling Switch, 1 NO + 1 NC, Spr","metaDescription":"Siemens 3RV2921-2M SIRIUS signaling switch for 3RV2 breakers. 1 NO + 1 NC contacts, spring-loaded terminals. Active production. Sourced to order against RFQ.","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)","Width":"18 mm","title":"3RV2921-2M","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 spring-type 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 (20 ... 14)","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²)","Finely Stranded Without Core End Processing":"0.5 ... 1.5 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":"spring-loaded 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":"20 ... 14"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$11.43","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a33f8059c599d83fee91524cd5387940.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=497279&mlfb=3RV2921-2M"},"ai":{"faq":[{"question":"What is 3RV2921-2M used for?","answer":"It mounts to a 3RV2 motor-protective circuit breaker to provide a separate tripped signal and short-circuit alarm via one NO and one NC contact each, so the control system can distinguish a thermal overload from a fault."},{"question":"What wire sizes does the spring terminal accept?","answer":"Solid or stranded 0.5 to 2.5 mm², or 2x 0.5 to 1.5 mm² with ferruled ends. AWG 20 to 14 for the auxiliary contact circuit."},{"question":"Where can I buy 3RV2921-2M?","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 your quantity and delivery target."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2921-2M","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/3RV2921-2M 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}}