{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV6901-1B","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV6901-1B","canonicalUrl":"https://aoctrl.com/siemens/3RV6901-1B","factsUrl":"https://aoctrl.com/api/mcp/products/3RV6901-1B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS lateral auxiliary switch, 3RV6901-1B, 2 NO contacts, 9.5 mm width, screw-type terminals, for circuit breaker sizes S00, S0, S2, S3.","salesMarkdown":"The Siemens 3RV6901-1B is a lateral auxiliary switch from the SIRIUS family, designed to snap onto the side of SIRIUS circuit breakers in sizes S00, S0, S2, and S3. It adds two normally-open (2 NO) instantaneous contacts to the breaker, letting you pick off a status signal or interlock a control circuit without a separate contactor. The 2 NO contacts carry a range of voltage-specific current ratings that reflect real switching duty, not just a single thermal current. At 24 V it switches 2 A; at 110 V it drops to 0.5 A; at 220 V it handles 0.25 A. For higher-voltage control circuits, the AC-12 maximum is 10 A at 230 V, and the AC-15 rating at 690 V is 1 A — the latter is the one to check if you're switching an inductive contactor coil at line voltage. The 690 V 10 A entry likely reflects the AC-12 resistive load ceiling at that voltage, while the 400 V 3 A sits between typical motor-control voltages. The screw-type terminals accept 0.5 to 2.5 mm² solid or stranded wire (2x 0.5…1.5 mm² or 2x 0.75…2.5 mm² per clamp), which covers the common control-circuit wire sizes in a panel. AWG 20 to 14 is the coded range for the auxiliary contact terminals. The plug-in fixing means it clips directly to the breaker body without extra hardware. ## Compliance documentation The substance prohibitance date is 05/01/2012.","metaTitle":"Siemens 3RV6901-1B SIRIUS Lateral Auxiliary Switch, 2 NO, 9.","metaDescription":"Siemens 3RV6901-1B SIRIUS lateral auxiliary switch for S00-S3 circuit breakers. 2 NO contacts, 9.5 mm wide, screw terminals. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"70 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"9.5 mm","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","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":"auxiliary switch, lateral","Design Of The Product":"lateral auxiliary switches","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Substance Prohibitance (Date)":"05/01/2012","for AWG cables for auxiliary contacts":"2x (20 ... 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":"0","number of NO contacts for auxiliary contacts instantaneous contact":"2","AWG number as coded connectable conductor cross section for auxiliary contacts":"20 ... 14"}},"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=621347&mlfb=3RV6901-1B","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV6901-1B/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RV6901-1B used for?","answer":"It adds two normally-open auxiliary contacts to the side of SIRIUS circuit breakers in sizes S00, S0, S2, and S3, providing a status signal or control interlock without requiring a separate contactor block."},{"question":"Will the 3RV6901-1B fit a panel designed for the 3RV6021-4DA10 motor-protective circuit breaker?","answer":"The 3RV6901-1B is a lateral auxiliary switch for SIRIUS breakers; the 3RV6021-4DA10 is a complete S0 motor-protective circuit breaker. The auxiliary switch clips onto the side of that breaker (S0 is within the supported size range), so it will fit without rewiring the main power circuit — just snap it on and terminate the two NO contacts to your control wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV6901-1B","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/3RV6901-1B 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}}