{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM1342-6FD","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM1342-6FD","canonicalUrl":"https://aoctrl.com/siemens/5SM1342-6FD","factsUrl":"https://aoctrl.com/api/mcp/products/5SM1342-6FD","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SM1342-6FD FI-Protector Type A (PSE/SSF), 25A 4-pole, 30mA IΔn, 400V, 55mm, 4TE, current lifecycle stage.","salesMarkdown":"The Siemens 5SM1342-6FD is a Type A FI-Protector (PSE/SSF) — a 4-pole residual current device rated 25A with a 30mA trip threshold, designed for 400V systems. The 55mm width and 4TE (4 module units) DIN-rail footprint fit standard distribution board layouts. Type A detection handles pulsating DC fault currents from single-phase rectifiers, VFDs, or switched-mode supplies — common on mixed-load panels where pure sine-wave RCDs would nuisance-trip. The 30mA IΔn (residual operating current) is the standard threshold for personnel protection per IEC 60364 — it clears earth faults before ventricular fibrillation risk. The 25A rated current matches the upstream MCB or fuse rating for a 4-pole circuit feeding mixed resistive and electronic loads. Type A classification means it's suitable for circuits with single-phase rectification downstream (computers, LED drivers, small VFDs); Type AC devices would not detect the pulsating DC component and could fail to trip. ## Panel integration Snap-on DIN rail mounting, 4TE wide (roughly 70mm). The 55mm depth fits standard 63A-rated enclosures without crowding the gland plate. Terminal capacity accepts up to 25mm² conductors for the main circuit; busbar-compatible for multi-pole distribution blocks.","metaTitle":"Siemens 5SM1342-6FD FI-Protector Type A, 25A 30mA 4P 400V","metaDescription":"Siemens 5SM1342-6FD FI-Protector Type A (PSE/SSF), 25A 4-pole, 30mA IΔn, 400V, 55mm, 4TE. Current lifecycle stage. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"lifecycle_stage":"current"}},"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=134749&mlfb=5SM1342-6FD","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM1342-6FD/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM1342-6FD and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."},{"question":"What does Type A mean on this RCD?","answer":"Type A detection covers sinusoidal AC residual currents plus pulsating DC up to 6mA — the waveform produced by single-phase rectifiers in VFDs, LED drivers, and switched-mode power supplies. It prevents nuisance tripping on modern electronic loads while maintaining personnel protection."},{"question":"What is the physical size of 5SM1342-6FD?","answer":"55mm depth, 4TE (4 module units) wide on DIN rail — fits standard 63A distribution board cutouts. The 4-pole design occupies the same width as a 4-pole MCB."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM1342-6FD","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/5SM1342-6FD 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}}