{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3748-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3748-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3748-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3748-0","rawCanonicalId":null},"summary":{"shortDescription":"SENTRON 5SM3748-0 RCCB, 4-pole, type AC, In 100 A, 500 mA, Un AC 400 V, instantaneous.","salesMarkdown":"The SENTRON 5SM3748-0 is a 4-pole residual current operated circuit breaker (RCCB), type AC, rated 100 A at 400 V AC with a 500 mA tripping fault current. It is an instantaneous design, meaning it trips without a time delay when the residual current exceeds 500 mA. This covers the basic earth-leakage protection requirement for a 4-wire (3-phase + neutral) supply in a distribution board. The 500 mA residual current trip threshold is higher than the standard 30 mA used for personal shock protection; it is typically specified for equipment protection or where high leakage from filters or drives would nuisance-trip a lower-sensitivity device. The 4-pole configuration switches all three phases and the neutral, so it fits a 3P+N distribution board without a separate neutral link.","metaTitle":"SENTRON 5SM3748-0 RCCB, 4-pole, Type AC, 100 A, 500 mA","metaDescription":"SENTRON 5SM3748-0 RCCB, 4-pole, type AC, rated 100 A at 400 V AC, 500 mA trip. Current lifecycle stage. 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":{"Number Of Poles":"4","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"RCCB","at AC / rated value":"100 A","Design Of The Product":"Instantaneous","Residual Current Type":"AC","Tripping Fault Current / Rated Value":"500 mA","Supply Voltage Frequency / Rated Value":"50 Hz"}},"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=147094&mlfb=5SM3748-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3748-0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3748-0 and how do I get a price?","answer":"The part is available to order through independent distribution. Submit an RFQ for current pricing and availability confirmation."},{"question":"When sourcing 5SM3748-0, what's the closest functional second-source — 5SQ2670-2YA16?","answer":"The 5SQ2670-2YA16 is a 4-pole MCB (miniature circuit breaker), not an RCCB. It provides overcurrent protection (16 A, C-curve, 3 kA breaking capacity) but no residual current protection. The 5SM3748-0 serves a different function: earth-leakage detection. They are not drop-in substitutes and serve different roles in a panel."},{"question":"What is 5SM3748-0's listed number of poles (4) on this component line?","answer":"The 5SM3748-0 is a 4-pole device, switching all three phases and neutral."},{"question":"What compliance documentation does this brand provide for 5SM3748-0 (RoHS, REACH, UL, IEC)?","answer":"As a SENTRON product, the 5SM3748-0 is designed and tested to applicable IEC standards for RCCBs. Specific documentation (RoHS, REACH, UL) should be confirmed at time of order; the manufacturer typically provides declarations on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3748-0","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/5SM3748-0 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}}