{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM9623-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM9623-0","canonicalUrl":"https://aoctrl.com/siemens/5SM9623-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM9623-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM9623-0 RC unit electronic for 5SL4, 2-pole, type AC, In: 40 A, 300 mA, Un AC: 400 V.","salesMarkdown":"It's rated for 40 A continuous current and trips on AC fault currents at 300 mA, with a supply voltage of 230/400 V AC. For pulsating DC or smooth DC fault currents, you'd need a type A or type B unit. The 300 mA trip threshold is typical for fire protection or high-leakage industrial circuits rather than personal shock protection (which usually calls for 30 mA). The surge current resistance is 3 kA, so it can handle the inrush from a downstream short circuit without nuisance tripping or damage. ## Terminal & Wiring Screw-type terminals accept solid conductors from 0.75 to 35 mm² and stranded from 0.75 to 25 mm². Tightening torque is 2.5 to 3 N·m — a standard screwdriver setting, no special tooling needed. The supply cord connects at the top, above the miniature circuit breaker. Installation depth is 70 mm, matching the 5SL4 breaker it pairs with. That's a common depth for DIN-rail residential and light commercial panels; no extra enclosure depth required. The unit is silicon-free.","metaTitle":"Siemens 5SM9623-0 SENTRON RC Unit, 40 A, 300 mA, 2P, Type AC","metaDescription":"Siemens 5SM9623-0 SENTRON residual current unit for 5SL4 MCB, 40 A rated, 300 mA trip, 2-pole, type AC. Active production. 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":{"Depth":"70 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","title":"5SM9623-0","Height":"100 mm","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","description":"RC unit for 5SL4, 2-pole, type AC, In: 40 A, 300 mA, Un AC: 400 V","Mounting type":"Standard rail mounting","During Storage":"-40 ... +75 °C","Number of poles":"2","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product variations":"DI unit, type AC, 0.3...40 A, 2P, 300 mA","Ambient temperature":"-25 ... +55 °C","Product designation":"RC unit electronic for 5SL4","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage category":"III","Design of the product":"Instantaneous","Number of width units":"2","Type of fault current":"AC","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SM9","Current / at AC / rated value":"40 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"Top, above miniature circuit breaker","Supply voltage / at AC / rated value":"230/400 V","Surge current resistance / rated value":"3 kA","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 mA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Size of installation devices / acc. to DIN 43880":"1","Supply voltage / for testing equipment / minimum":"125 V","Mechanical service life (switching cycles) / typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5c86d948aeab9a4c6998a7a0295f7201.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629206&mlfb=5SM9623-0"},"ai":{"faq":[{"question":"What is 5SM9623-0 used for?","answer":"The 5SM9623-0 is a residual current unit (RC unit) that mounts on a Siemens 5SL4 miniature circuit breaker to create a combined RCBO. It provides AC fault current protection at 300 mA for 40 A circuits at 230/400 V."},{"question":"Where can I buy 5SM9623-0?","answer":"The 5SM9623-0 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM9623-0","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/5SM9623-0 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}}