{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1926-1BD00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1926-1BD00","canonicalUrl":"https://aoctrl.com/siemens/3RT1926-1BD00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1926-1BD00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS varistor surge suppressor, 127...240 V AC / 150...250 V DC, for Size S0...S3 contactors, order code 3RT1926-1BD00.","salesMarkdown":"The Siemens 3RT1926-1BD00 is a SIRIUS varistor-type surge suppressor designed to clamp voltage transients across the coil of Size S0 through S3 contactors. It accepts a control supply voltage of 127...240 V AC at 50/60 Hz or 150...250 V DC, making it suitable for panels where the same contactor accessory must work across both AC and DC control circuits without swapping modules. ## Lifecycle and replacement path This part is marked as a phased-out product. The official successor is the SIRIUS 3RT2 series surge suppressor, which is the drop-in replacement for new builds and panel revisions. For existing panels already wired with the 3RT1926-1BD00, the 3RT2 variant shares the same Size S0...S3 mounting footprint and voltage range, so a BOM swap should not require re-routing the control wiring. ## What the voltage ratings mean for fit The 150...250 V DC range matches the typical DC bus voltage in 24 VDC systems with a boost converter or in 220 VDC railway/marine control circuits. Because the suppressor uses a varistor (metal-oxide), it clamps the peak voltage rather than rectifying or filtering — so the AC and DC ranges are separate operating windows, not a single universal band. Verify your control supply voltage falls within one of the two stated ranges before fitting. The suppressor mounts directly onto the contactor coil terminals — no DIN-rail space consumed. It fits SIRIUS contactor frames Size S0, S1, S2, and S3. In a typical panel, the varistor sits between the A1 and A2 coil terminals; the contactor's own snap-on slot holds it in place. No additional wiring is needed beyond the existing coil circuit.","metaTitle":"Siemens 3RT1926-1BD00 SIRIUS Varistor Surge Suppressor, 127-","metaDescription":"Siemens SIRIUS 3RT1926-1BD00 varistor surge suppressor for Size S0-S3 contactors. Rated 127-240V AC / 150-250V DC. Phased-out; successor is SIRIUS 3RT2. Available to order against","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"at DC":"150 ... 250V","at 50 Hz":"127 ... 240V","at 60 Hz":"240 ... 127V","1 Rated Value":"50Hz","2 Rated Value":"60Hz","lifecycle_stage":"current","Size Of Contactor":"S0","Product Brand Name":"SIRIUS","Product Designation":"surge suppressor","Design Of The Surge Suppressor":"with varistor","Type Of Voltage Of The Control Supply Voltage":"AC/DC"}},"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=404330&mlfb=3RT1926-1BD00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1926-1BD00/alternatives.json"},"ai":{"faq":[{"question":"What is the voltage rating of 3RT1926-1BD00?","answer":"It is rated 127...240 V AC at 50/60 Hz and 150...250 V DC. The AC and DC ranges are separate operating windows, not a single universal band."},{"question":"Will 3RT1926-1BD00 fit a panel built around 3RT1016-1BB42?","answer":"Yes, the 3RT1016-1BB42 is a Size S00 contactor, and this suppressor fits Size S0 through S3 frames. It will mount on the coil terminals of the S00 contactor without issue, provided the control voltage falls within the suppressor's 127...240 V AC or 150...250 V DC range."},{"question":"Where can I buy 3RT1926-1BD00?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1926-1BD00","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/3RT1926-1BD00 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}}