{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3321-4","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3321-4","canonicalUrl":"https://aoctrl.com/siemens/5SM3321-4","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3321-4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3321-4, 2-pole RCCB, type B, short-time delayed, 16 A rated current, 30 mA rated residual current, 230 V AC, 50/60 Hz.","salesMarkdown":"The Siemens 5SM3321-4 is a 2-pole residual current circuit breaker (RCCB) from the SENTRON series, designed for 230 V AC supply at 50/60 Hz. It is rated at 16 A with a 30 mA residual current sensitivity and is type B, meaning it detects AC, pulsating DC, and smooth DC fault currents — required where variable-speed drives, UPS systems, or photovoltaic inverters are on the circuit. The short-time delayed design (selective type) provides discrimination: in a fault event, the downstream RCCB trips first, leaving this unit and upstream devices undisturbed. This suits sub-distribution boards feeding multiple socket-outlet circuits or mixed loads. Snaps onto DIN rail (REG) per EN 60715. Depth is 70 mm — verify cabinet door clearance; some shallow enclosures need the 70 mm plus wiring space. Mounting position is unrestricted, but the IP20 rating is conditional on the distribution board being installed and conductors connected.","metaTitle":"Siemens 5SM3321-4 SENTRON RCCB, 2-pole Type B, 16 A, 30 mA,","metaDescription":"Siemens 5SM3321-4 SENTRON RCCB, 2-pole, type B, short-time delayed, 16 A, 30 mA, 230 V AC. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Width":"72 mm","title":"5SM3321-4","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","description":"Residual current operated circuit breaker, 2-pole, type B, short-time delayed, In: 16 A, 30 mA, Un AC: 230 V","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"DIN rail (REG)","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Product Designation":"RCCB","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Short-time delayed","Product Feature Silicon-Free":"Yes","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","according to EN 60898 rated value":"0.8 kA","according to IEC 61008-1 rated value":"0.8 kA","Switching Function Short-Term Delayed":"Yes","Value Range Of The Operating Frequency":"50/60 Hz","value range of the supply voltage at AC":"230 V","Ambient Temperature During Storage Minimum":"-40 °C","Value Range Of The Supply Voltage Frequency":"50 Hz","Supply Voltage For Testing Equipment Minimum":"195 V","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","for rated value of the current at AC in hot operating state per pole":"0.4 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/02ba644d493b499f1d6fa1a40a3c0a0d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=517249&mlfb=5SM3321-4"},"ai":{"faq":[{"question":"What is the 5SM3321-4 used for?","answer":"It is a 2-pole type B RCCB used for residual current protection in 230 V AC circuits where smooth DC fault currents may be present — such as circuits with VFDs, UPS systems, or PV inverters. The short-time delayed design provides selectivity in sub-distribution boards."},{"question":"Where can I buy the 5SM3321-4?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of the 5SM3321-4?","answer":"The rated breaking capacity is 0.8 kA according to both EN 60898 and IEC 61008-1."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3321-4","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/5SM3321-4 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}}