{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SU1356-0KV20","brand":"Siemens","brandSlug":"siemens","productSlug":"5SU1356-0KV20","canonicalUrl":"https://aoctrl.com/siemens/5SU1356-0KV20","factsUrl":"https://aoctrl.com/api/mcp/products/5SU1356-0KV20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 5SU1356-0KV20, FI/LS-PROTECTOR TYPE AC (WS), D=70MM IFN 30MA, 6KA, 1+N-POLE B 20A.","salesMarkdown":"## FI/LS Protector, Type AC, 30 mA, 6 kA, 1+N-Pole, B 20 A The Siemens 5SU1356-0KV20 is a combined RCD and MCB in a single 1+N-pole module. It integrates Type AC residual-current detection at 30 mA with a B-curve overcurrent trip at 20 A, rated for 6 kA breaking capacity. The 30 mA residual sensitivity (IFN) covers sinusoidal AC fault currents to ground — the standard for general-purpose socket-outlet protection in residential and commercial final circuits. Type AC means it detects pure AC residual currents only; if the load includes rectified or pulsed DC (e.g., VFDs, LED drivers, UPS), a Type A or Type F device would be required. The B-curve 20 A overcurrent characteristic trips between 3 and 5 times rated current (60–100 A), suited for resistive and moderate inductive loads like lighting, small heaters, and general-purpose outlets. The 1+N-pole format switches the line (L) and provides a switched neutral (N) in a single-width (70 mm) module, matching standard DIN-rail enclosures. The neutral pole opens and closes with the line, ensuring isolation on both conductors when the device trips or is manually switched off. ## Deployment Context Snap-on DIN-rail mounting for 70 mm enclosure width. Terminals accept copper conductors per the manufacturer's wiring specification; strip length and torque settings follow the markings on the device housing. The combined RCD/MCB format saves one module width compared to separate devices in series.","metaTitle":"Siemens 5SU1356-0KV20 FI/LS Protector, Type AC, 30mA, 6kA, B","metaDescription":"Siemens 5SU1356-0KV20 FI/LS protector, Type AC, 30mA residual, 6kA breaking capacity, 1+N-pole, B-curve 20A. Current production. Quoted to order.","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=32754&mlfb=5SU1356-0KV20","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SU1356-0KV20/alternatives.json"},"ai":{"faq":[{"question":"What does Type AC residual detection mean for this device?","answer":"Type AC detects sinusoidal AC residual currents only. For circuits with non-sinusoidal or pulsed DC fault currents (e.g., from VFDs or LED drivers), a Type A or Type F device would be required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SU1356-0KV20","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/5SU1356-0KV20 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}}