{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3446-0LB01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3446-0LB01","canonicalUrl":"https://aoctrl.com/siemens/5SM3446-0LB01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3446-0LB01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series, 5SM3446-0LB01, 4-pole RCCB, type AC, short-time delayed, 63 A, 100 mA, 230 V AC, DIN rail mount.","salesMarkdown":"## 63 A, 100 mA, short-time delayed — what that means on the line The Siemens SENTRON 5SM3446-0LB01 is a 4-pole residual current circuit breaker (RCCB) rated for 63 A continuous at 230 V AC, with a 100 mA trip sensitivity and a short-time delayed switching function. That 100 mA threshold means it's sized for equipment protection or fire prevention rather than personnel shock protection — the human-body let-go threshold is 30 mA, so this unit trips above that, intended for circuits where nuisance tripping on normal leakage (long cable runs, VFDs, heaters) would be a problem. The short-time delay (type S / selective) lets it ride out transient earth faults downstream while coordinating with a 30 mA RCCB closer to the load, so only the faulted branch clears. Rated short-circuit current withstand is 10 kA, and surge current resistance is 3 kA — figures that tell you this RCCB can survive a bolted fault on a 230/400 V distribution board without rupturing, and it won't false-trip on lightning or capacitor-switching surges. Overvoltage category III confirms it's rated for fixed-installation distribution panels, not just downstream socket circuits. Mounts on DIN rail (REG), occupies 4 width units (roughly 72 mm), installation depth 70 mm. The supply cord position is top or bottom — no forced orientation, which saves wire-bending radius in a crowded enclosure. Finger and back-of-hand safe per the protection-against-electrical-shock rating. That -5 °C floor means it's not rated for unheated outdoor cabinets in freezing climates — if the panel sits in a cold warehouse, you'll need a space heater or a different RCCB rated for lower ambients. Silicon-free construction, which matters for potting and conformal-coating compatibility in sealed assemblies.","metaTitle":"Siemens 5SM3446-0LB01 SENTRON RCCB, 4P, 63A, 100mA, Type AC","metaDescription":"Siemens SENTRON 5SM3446-0LB01 4-pole RCCB, 63 A rated, 100 mA trip, type AC, short-time delayed. DIN rail mount, IP20. Current lifecycle stage. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Maximum":"45 °C","Minimum":"-5 °C","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"230 V","Overvoltage category":"III","Design of the product":"Short-time delayed","Number of width units":"4","Type of fault current":"AC","circuit-breaker / Design":"5SM3","Short-circuit current rating":"10 kA","Current / at AC / rated value":"63 A","Product feature / silicon-free":"Yes","For Testing Equipment / Minimum":"100 V","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Surge current resistance / rated value":"3 kA","Switching function / short-term delayed":"Yes","Tripping residual current / rated value":"100 mA","Size of installation devices / acc. to DIN 43880":"1","Mechanical service life (switching cycles) / typical":"10 000"}},"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=23693&mlfb=5SM3446-0LB01","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3446-0LB01/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between this RCCB and a 5SQ series MCB?","answer":"The 5SM3446-0LB01 is a residual current device (RCCB) that detects earth leakage and trips at 100 mA. The 5SQ2670-2YA63 is a miniature circuit breaker (MCB) that protects against overcurrent and short-circuit with a C-curve trip characteristic. They serve different protection functions — an RCCB and an MCB are typically wired in series, not swapped. The 5SM3 has a 70 mm installation depth versus 55 mm on the 5SQ, so they won't share the same backplane depth in a panel."},{"question":"What is the rated current and trip sensitivity of 5SM3446-0LB01?","answer":"Rated current is 63 A at 230 V AC. Tripping residual current is 100 mA, type AC (sinusoidal AC fault currents only)."},{"question":"Where can I buy 5SM3446-0LB01 and how is it quoted?","answer":"This part is sourced and quoted to order through independent distribution. Submit an RFQ for current availability and pricing — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3446-0LB01","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/5SM3446-0LB01 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}}