{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3445-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3445-6","canonicalUrl":"https://aoctrl.com/siemens/5SM3445-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3445-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3445-6, 4-pole RCCB, 125 A, Type A, 100 mA residual current, instantaneous, 10 kA SCCR, DIN rail mount.","salesMarkdown":"## What this RCCB does and where it fits The Siemens 5SM3445-6 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON family, rated 125 A at 50 Hz with a 100 mA Type A residual current trip. It is an instantaneous device — no short-time delay — so it trips as soon as the fault current exceeds the threshold. Type A detection covers sinusoidal AC residual currents plus pulsating DC residual currents up to 6 mA smooth DC — the standard choice for circuits with single-phase rectifiers, switched-mode power supplies, or electronic loads that produce pulsed DC faults. The 100 mA trip threshold suits sub-main or feeder protection where nuisance tripping from leakage on long cable runs or multiple SMPS loads needs to be avoided. Mounts on DIN rail (REG) in any position, which gives panel builders flexibility in crowded enclosures. The 4-modular-width (72 mm) body and 77 mm depth fit standard distribution board cutouts. Supply can enter from top or bottom, so it works in both feed-through and reverse-fed configurations common in retrofit work. ## Thermal derating — the real-world current limit Above that, the device derates linearly: 117.5 A at 50 °C, 110 A at 55 °C, 102.5 A at 60 °C, 95 A at 65 °C, and 87.5 A at 70 °C. Rated breaking capacity per EN 60898 is 1.25 kA; per IEC 61008-1 it is also 1.25 kA. The device is silicon-free, which matters in potting or conformal-coating environments where silicone outgassing can cause contact or adhesion failures. IP20 applies when installed in a distribution board with conductors connected — the enclosure provides the ingress protection.","metaTitle":"Siemens 5SM3445-6 SENTRON RCCB, 125 A, 4-Pole, Type A, 100 m","metaDescription":"Siemens 5SM3445-6 SENTRON RCCB, 125 A, 4-pole, Type A, 100 mA residual current, instantaneous, 10 kA SCCR, DIN rail mount. Current production. Available to order.","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","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Operating Frequency":"50 Hz","Product Designation":"RCCB","at AC / rated value":"125 A","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"A","I2t value / permissible":"94 000 A²·s","at 40 °C / rated value":"125 A","at 45 °C / rated value":"125 A","at 50 °C / rated value":"117.5 A","at 55 °C / rated value":"110 A","at 60 °C / rated value":"102.5 A","at 65 °C / rated value":"95 A","at 70 °C / rated value":"87.5 A","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"4","Product Feature / Silicon-Free":"Yes","acc. to EN 60898 / rated value":"1.25 kA","For Testing Equipment / Minimum":"100 V","Position / Of Power Supply Cord":"top or bottom","Let-Through Current / Permissible":"8 000 kA","Tripping Fault Current / Rated Value":"100 mA","Supply Voltage Frequency / Rated Value":"50 Hz","Surge Current Resistance / Rated Value":"1 kA","according to IEC 61008-1 / rated value":"1.25 kA","Switching Function / Short-Term Delayed":"No","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=228524&mlfb=5SM3445-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3445-6/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SM3445-6 and get a price?","answer":"The 5SM3445-6 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead-time estimate."},{"question":"What is the 5SM3445-6's depth?","answer":"The depth is 77 mm, with an installation depth of 70 mm. The width is 72 mm (4 modular units) and the height is 90 mm."},{"question":"What compliance documentation does the 5SM3445-6 carry?","answer":"The device is rated per EN 60898 (1.25 kA breaking capacity) and IEC 61008-1 (1.25 kA). Overvoltage category III applies. It is silicon-free. The manufacturer's standard declaration of conformity covers these standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3445-6","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/5SM3445-6 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}}