{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3345-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3345-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3345-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3345-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 4-pole, type AC, In: 125 A, 30 mA, Un AC: 400 V, 50 Hz, 10 kA SCCR, DIN rail mount, IP20.","salesMarkdown":"## Siemens 5SM3345-0 SENTRON 4-Pole RCCB — 125 A, 30 mA Sensitivity The Siemens 5SM3345-0 is a SENTRON residual current circuit breaker (RCCB), 4-pole, type AC, rated 125 A with 30 mA trip sensitivity at 400 V AC, 50 Hz. The 125 A continuous rating suits it for main incomer or sub-distribution duty in commercial and industrial panels where the full load current stays under that figure. Rated short-circuit current withstand (SCCR) is 10 kA per the product spec. The 1.25 kA rated value per EN 60898 and IEC 61008-1 refers to the conditional short-circuit current with a specified backup fuse or MCB; in practice, verify the upstream protective device's let-through stays within the RCCB's withstand curve. Mounting position is unrestricted — vertical, horizontal, or inverted — which simplifies layout in crowded enclosures. Installation depth is 70 mm, and overall depth is 77 mm including the housing. Operating ambient temperature range is -5 °C to +45 °C, with storage down to -40 °C. The -5 °C lower operating limit means it is not rated for unheated outdoor enclosures in freezing climates without supplementary heating. Power dissipation is 8.9 W per pole at rated current in hot operating state — approximately 35.6 W total for the 4-pole unit, which should be factored into enclosure thermal calculations to avoid derating. ## Installation and Integration Notes Supply connection is accepted from top or bottom — no mandatory orientation. Silicon-free construction is specified, which matters for applications where silicone outgassing can contaminate contacts or optical surfaces (e.g., automotive paint lines, clean-room zones). This is a switching endurance figure for manual operation and fault clearing; it does not reflect continuous switching duty as a regular load-break switch. The device is instantaneous (type AC) — no short-time delay, so it will trip on any sinusoidal AC residual current above 30 mA without intentional delay for selectivity with downstream RCDs.","metaTitle":"Siemens 5SM3345-0 SENTRON RCCB, 4-Pole, 125 A, 30 mA, 400 V","metaDescription":"Siemens SENTRON 5SM3345-0 4-pole RCCB, type AC, rated 125 A at 30 mA sensitivity, 400 V, 50 Hz. 10 kA SCCR. 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":"77 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-5 °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":"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":"8.9 W"}},"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=195062&mlfb=5SM3345-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3345-0/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM3345-0 used for?","answer":"The 5SM3345-0 is a 4-pole residual current circuit breaker (RCCB) rated 125 A with 30 mA sensitivity at 400 V AC, 50 Hz. It provides earth leakage protection for personnel and equipment in commercial and industrial distribution panels, typically as a main incomer or sub-distribution protector."},{"question":"Where can I buy the 5SM3345-0?","answer":"The 5SM3345-0 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation is available for the 5SM3345-0?","answer":"The 5SM3345-0 is designed and tested to EN 60898 and IEC 61008-1 standards for residual current circuit breakers. It carries a 1.25 kA rated conditional short-circuit current per those standards. The product is silicon-free. Specific RoHS, REACH, and UL documentation should be confirmed at time of order through the RFQ process."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3345-0","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/5SM3345-0 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}}