{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1918-5B","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1918-5B","canonicalUrl":"https://aoctrl.com/siemens/3RV1918-5B","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1918-5B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary switch for circuit breaker size S00, 2 NO contacts, solder pin connection, 10 A maximum at 690 V, 3RV1918-5B.","salesMarkdown":"## Auxiliary switch for S00 breakers — solder pin variant The Siemens 3RV1918-5B is a SIRIUS auxiliary switch designed for the S00 frame size of the 3RV motor-protective circuit breaker family. It provides two normally-open (NO) instantaneous contacts via solder pin terminals — no screw-clamp wiring, so it mates directly to a PCB or a mating connector header inside the panel. Rated at 10 A maximum at 690 V AC, the contacts handle the signal-level switching common in control circuits — pilot devices, PLC inputs, contactor coils — not main motor current. The AC-15 rating at 690 V drops to 1 A, which is the inductive load limit for solenoid and contactor coils at that voltage. ## Lifecycle and replacement path For existing panels with the 3RV1 breaker family, this auxiliary switch remains a critical spare — one in the cabinet before it fails. Clips onto the side of a 3RV1 S00 circuit breaker — no DIN rail space consumed, no extra wiring channel needed. The solder pins project downward; plan for a mating connector or PCB clearance below the breaker in the panel layout.","metaTitle":"Siemens 3RV1918-5B SIRIUS Auxiliary Switch, 10A, Solder Pin","metaDescription":"Siemens 3RV1918-5B SIRIUS auxiliary switch for S00 breakers, 2 NO contacts, solder pin terminals, 10A max at 690V. Phased-out — successor 3RV2 series available. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Maximum":"10A","at 24 V":"2A","at 48 V":"0.3A","at 60 V":"0.15A","at 230 V":"4A","at 400 V":"3A","at 690 V":"10A","During Storage":"-50 ... +80°C","lifecycle_stage":"current","During Operation":"-20 ... +60°C","Product brand name":"SIRIUS","Size of the circuit-breaker":"S00","at AC-15 at 690 V rated value":"1A","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","Type of electrical connection for auxiliary and control current circuit":"solder pin connectors"}},"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=308988&mlfb=3RV1918-5B","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1918-5B/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV1918-5B fit a 3RV2 breaker?","answer":"No — it is designed for the 3RV1 S00 frame. The 3RV2 series uses a different mechanical interface; use the 3RV2-specific auxiliary switch."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1918-5B","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/3RV1918-5B 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}}