{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3645-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3645-6","canonicalUrl":"https://aoctrl.com/siemens/5SM3645-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3645-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 4-pole, type A, In 125 A, IΔn 300 mA, Un AC 400 V, instantaneous, DIN rail mount.","salesMarkdown":"The Siemens 5SM3645-6 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON family, rated 125 A with a 300 mA residual trip threshold, type A, for 400 V AC 50 Hz networks. It is an instantaneous (non-time-delayed) device, meaning it trips without intentional delay on a ground fault — suited for general distribution where selectivity with downstream RCDs is not required. The 10 kA short-circuit current rating (SCCR) per EN 60898 and IEC 61008-1 means the device can safely interrupt a fault up to 10 kA without external backup fusing, though the 1.25 kA rated conditional short-circuit capacity (also per both standards) is the value to coordinate with upstream protection for selectivity studies. Mounting position is unrestricted — vertical or horizontal in the enclosure. The IP20 rating applies only when the distribution board is installed and conductors are connected — normal for a panelboard interior. ## Environmental and mechanical notes Silicon-free construction. Mechanical service life 10 000 operating cycles typical. Supplementary devices (e.g. auxiliary switches, shunt trips) can be installed on the side.","metaTitle":"Siemens 5SM3645-6 SENTRON RCCB, 4P, 125A, 300mA, 400V","metaDescription":"Siemens 5SM3645-6 SENTRON 4-pole RCCB, type A, 125 A, 300 mA residual, 400 V AC, 10 kA SCCR. DIN rail mount. Current production. Quoted on request.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","Number Of Poles":"4","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":"Instantaneous","Product Feature Silicon-Free":"Yes","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"top or bottom","according to EN 60898 rated value":"1.25 kA","according to IEC 61008-1 rated value":"1.25 kA","Switching Function Short-Term Delayed":"No","Value Range Of The Operating Frequency":"50 Hz","value range of the supply voltage at AC":"400 V","Ambient Temperature During Storage Minimum":"-40 °C","Value Range Of The Supply Voltage Frequency":"50 Hz","Supply Voltage For Testing Equipment Minimum":"100 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":"8.9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$717.55","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=396219&mlfb=5SM3645-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3645-6/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3645-6","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/5SM3645-6 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}}