{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1656-6KV20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1656-6KV20","canonicalUrl":"https://aoctrl.com/siemens/5SU1656-6KV20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1656-6KV20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SU1656-6KV20 FI/LS-protector Type A (PSE/SSF), 1+N-pole B 20A, 300mA, 6kA, D=70mm.","salesMarkdown":"The Siemens 5SU1656-6KV20 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS-protector Type A (PSE/SSF) — in a single 1+N-pole unit. It integrates overcurrent protection (B-curve, 20A) with a 300mA residual-current trip, rated for a 6kA short-circuit capacity. The 'Type A' designation means it detects pulsating DC fault currents in addition to sinusoidal AC, making it suitable for circuits with single-phase electronics like washing machines, heat pumps, or EV chargers where simple AC-only RCDs could be blinded. The 300mA sensitivity is a delayed-trip (S-type equivalent) often used for fire protection or circuits where nuisance tripping from leakage currents in long cable runs would be a problem. The 70mm depth (D=70MM) fits standard Siemens distribution boards and most DIN-rail enclosures. For a sourcing buyer, the 'current' status means the part is available through standard Siemens distribution channels. If you are filling a BOM line or stocking spares, this part is a safe, non-obsolete pick. ## Where this class of device is used FI/LS-protectors (RCBOs) like this one are installed in final distribution boards to protect individual circuits. They combine overcurrent and earth-fault protection in one DIN-rail module, saving panel space compared to a separate MCB and RCD. The Type A characteristic plus 300mA sensitivity makes this a common choice for commercial kitchens, laundries, and any circuit feeding single-phase inverter-driven loads where a standard Type AC RCD would be at risk of failing to trip on a pulsating DC fault.","metaTitle":"Siemens 5SU1656-6KV20 FI/LS Protector Type A, B 20A 300mA 6k","metaDescription":"Siemens 5SU1656-6KV20 FI/LS-protector Type A (PSE/SSF), 1+N-pole B 20A, 300mA, 6kA, D=70mm. Lifecycle stage: current. Quoted to order against an 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=269301&mlfb=5SU1656-6KV20","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1656-6KV20/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SU1656-6KV20 used for?","answer":"It is a combined RCD/MCB (FI/LS-protector) for a 1+N-pole circuit, providing overcurrent protection (B-curve, 20A) and residual-current protection (Type A, 300mA) with a 6kA short-circuit rating. It is used in distribution boards for circuits requiring both overcurrent and earth-fault protection in one module."},{"question":"Where can I buy the 5SU1656-6KV20?","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 commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1656-6KV20","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/5SU1656-6KV20 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}}