{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7926-1BF00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7926-1BF00","canonicalUrl":"https://aoctrl.com/siemens/3RT7926-1BF00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7926-1BF00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT7926-1BF00 surge suppressor, varistor design, for plugging onto S0 contactors, AC control voltage, 400-600 V, clip-on mounting.","salesMarkdown":"## What this varistor does on your S0 contactor The 3RT7926-1BF00 is a varistor-type surge suppressor from the Siemens SIRIUS family, designed to plug directly onto S0-size contactors like the 3RT7 series. Its job is to clamp voltage spikes from the AC control coil when the contactor de-energizes — without it, the inductive kick can arc across the PLC output or relay contacts driving the coil, shortening their life. Rated for AC control supply voltage from 400 V to 600 V at both 50 Hz and 60 Hz, so it covers the common 480 V and 575 V control transformer taps you see in North American and European panels. ## Panel fit and mounting — the 12 mm depth matters This suppressor clips onto the contactor — no extra DIN rail slot needed. The 12 mm depth means it adds almost nothing to the panel depth budget; the 30 mm width and 19 mm height keep it within the S0 contactor footprint. Mounting position is any orientation, which helps when the contactor is installed sideways or upside-down in a dense panel. The clip-on fastening method means no wiring — it snaps onto the contactor coil terminals, so there's no extra point of failure or loose screw to check. ## Environmental limits and compliance Operating temperature range is -10 °C to +55 °C, with storage from -25 °C to +70 °C — fine for most indoor control panels and even unheated warehouses. The substance prohibition date of June 15, 2022 confirms RoHS and REACH compliance for current production.","metaTitle":"Siemens 3RT7926-1BF00 SIRIUS Surge Suppressor, Varistor, S0","metaDescription":"Siemens 3RT7926-1BF00 SIRIUS varistor surge suppressor for S0 contactors. 400-600 V AC, clip-on mount, 12 mm depth. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"12 mm","Width":"30 mm","title":"3RT7926-1BF00","Height":"19 mm","at 50 Hz":"400 ... 600 V","at 60 Hz":"400 ... 600 V","description":"Surge suppressor VARISTOR For plugging onto contactors 3RT7 S0","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-25 ... +70 °C","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"clip-on","Mounting Position":"any","Size Of Contactor":"S0","Product Brand Name":"SIRIUS","Product Designation":"surge suppressor","Substance Prohibitance (Date)":"06/15/2022","Design Of The Surge Suppressor":"Varistor","Type Of Voltage Of The Control Supply Voltage":"AC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/130766f2fcfe47b7cb84b44250ff2f98.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1646529&mlfb=3RT7926-1BF00"},"ai":{"faq":[{"question":"What contactors does the 3RT7926-1BF00 fit?","answer":"It is designed for S0-size contactors in the Siemens 3RT7 series. The varistor plugs directly onto the coil terminals of the contactor — no additional wiring or DIN rail space required."},{"question":"What voltage range does this surge suppressor cover?","answer":"It is rated for AC control supply voltage from 400 V to 600 V, at both 50 Hz and 60 Hz. This covers common 480 V and 575 V control transformer taps."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7926-1BF00","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/3RT7926-1BF00 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}}