{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1948-1K","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1948-1K","canonicalUrl":"https://aoctrl.com/siemens/3RV1948-1K","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1948-1K","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1948-1K terminal block, Type E acc. to UL, for circuit breaker Size S3, increased air clearances and creepage distances with phase barriers.","salesMarkdown":"The Siemens SIRIUS 3RV1948-1K is a terminal block designed for increased air clearances and creepage distances, incorporating phase barriers for circuit breaker Size S3. It is designated Type E per UL, which means the terminal block provides enhanced isolation spacing between conductors — critical for maintaining insulation integrity in higher-voltage or polluted environments where standard spacing would risk tracking or flashover. This part is marked as a phased-out product. The official replacement (3RV2948-1K) should be validated for fit — same Size S3 footprint and UL Type E designation, so the mechanical and clearance requirements carry over, but verify any control-wiring or accessory compatibility before committing the revision. ## What the UL Type E designation means for fit The Type E acc. to UL designation means this terminal block is built to meet UL's spacing requirements for increased air clearances and creepage distances. In practice, this matters when the breaker is installed in a panel where phase-to-phase or phase-to-ground clearance is tight — the integrated phase barriers prevent arc tracking between terminals. The Size S3 designation ties it to Siemens 3RV2 circuit breakers in that frame size; it mounts directly onto the breaker's terminals, so no additional DIN-rail space is consumed. For a panel OEM wiring a Size S3 motor-protective breaker, this block is the correct accessory to maintain the UL listing of the assembly.","metaTitle":"Siemens 3RV1948-1K SIRIUS Terminal Block, UL Type E, for Siz","metaDescription":"Siemens 3RV1948-1K SIRIUS terminal block, UL Type E design for increased clearances. Phased-out, successor is 3RV2948-1K. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"lifecycle_stage":"current","Product Brand Name":"SIRIUS","Product Designation":"Terminal block","Design Of The Product":"Type E acc. to UL"}},"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=415271&mlfb=3RV1948-1K","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1948-1K/alternatives.json"},"ai":{"faq":[{"question":"What replaces 3RV1948-1K?","answer":"The preferred successor is the SIRIUS 3RV2 series terminal block, order code 3RV2948-1K. Both are Size S3 and UL Type E, so the clearance and mounting requirements are consistent."},{"question":"Where can I buy 3RV1948-1K?","answer":"As a phased-out product, 3RV1948-1K is sourced through independent distribution channels. Availability and current pricing are confirmed at quote time against an RFQ."},{"question":"What is the product brand and series for 3RV1948-1K?","answer":"It is part of the Siemens SIRIUS brand, designated as a terminal block for circuit breaker Size S3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1948-1K","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/3RV1948-1K 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}}