{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM2745-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM2745-8","canonicalUrl":"https://aoctrl.com/siemens/5SM2745-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SM2745-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, selective RCD-unit, 4 poles, Type A, 63 A rated current, 500 mA fault current, 50/60 Hz, IP20.","salesMarkdown":"## Siemens 5SM2745-8 SENTRON Selective RCD — 63 A, 4-Pole, Type A The Siemens 5SM2745-8 is a SENTRON-brand selective residual current device (RCD unit) designed for 4-pole applications. The selective design (time-delayed) ensures coordination with downstream RCDs, so only the faulted circuit trips — critical for maintaining supply continuity in distribution boards where nuisance tripping of an upstream device would take out multiple loads. The 63 A AC rating at 50/60 Hz defines the continuous load this RCD can carry. Per the specification, it derates with ambient temperature: 58.6 A at 40 °C, 56.7 A at 50 °C, and 50.4 A at 70 °C. The 500 mA rated fault current is not adjustable, and the OFF-delay time is fixed (not adjustable), consistent with a selective (time-delayed) device that coordinates with 30 mA or 100 mA downstream RCDs. Type A residual current detection covers sinusoidal AC and pulsed DC up to 6 mA, which covers most modern electronic loads (switched-mode power supplies, variable-speed drives, LED drivers) that generate pulsed DC fault currents. The surge current resistance of 5 kA and surge voltage resistance of 4,000 V indicate the device withstands transient overvoltages common in industrial mains without nuisance tripping or damage. The insulation voltage (Ui) is rated at 460 V, and overvoltage category III applies — standard for fixed-installation distribution boards. Degree of pollution 2 (non-conductive pollution that becomes conductive only through condensation) is typical for enclosed panel environments.","metaTitle":"Siemens 5SM2745-8 SENTRON RCD Unit, 63 A, 4-Pole, Type A, 50","metaDescription":"Siemens 5SM2745-8 SENTRON selective RCD unit, 4-pole, 63 A rated current, Type A, 500 mA fault current. IP20, 50/60 Hz. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"124 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"No","Design Of Pole":"4 poles","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"REG","Mounting Position":"any","at AC rated value":"63 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Product Variations":"for 5SY","Degree Of Pollution":"2","Product Designation":"RCD-unit","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Selective","Residual Current Type":"A","at 40 °C rated value":"58.6 A","at 45 °C rated value":"58.59 A","at 50 °C rated value":"56.7 A","at 55 °C rated value":"54.81 A","at 60 °C rated value":"53.55 A","at 65 °C rated value":"52.29 A","at 70 °C rated value":"50.4 A","OFF-delay time adjustable":"No","For Testing Equipment Minimum":"195 V","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"top or bottom","Rated Fault Current Adjustable":"No","Protection Function False Tripping":"Yes","Tripping Fault Current Rated Value":"500 mA","insulation voltage (Ui) rated value":"460 V","Surge Current Resistance Rated Value":"5 kA","Surge Voltage Resistance Rated Value":"4 000 V","Value Range Of The Operating Frequency":"50/60 Hz","reference code according to IEC 81346-2":"F","Type Of Voltage Of The Operating Voltage":"AC","Value Range Of The Supply Voltage Frequency":"50 Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","for rated value of the current at AC in hot operating state per pole":"3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f5d367cd18a3842c710b5fc975f92e13.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=306544&mlfb=5SM2745-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM2745-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM2745-8 and how do I get a price?","answer":"The 5SM2745-8 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."},{"question":"What is 5SM2745-8's listed depth (77 mm) on this component line?","answer":"The listed depth is 77 mm, with an installation depth of 70 mm."},{"question":"What is 5SM2745-8's listed width (124 mm) on this component line?","answer":"The listed width is 124 mm, which corresponds to 3 modular width units (each 18 mm) on a DIN rail."},{"question":"What compliance documentation does this brand provide for 5SM2745-8 (RoHS, REACH, UL, IEC)?","answer":"The product reference code per IEC 81346-2 is F, and the design complies with overvoltage category III and degree of pollution 2. Specific RoHS, REACH, and UL documentation should be confirmed at quote time, as the evidence does not list those certifications explicitly."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM2745-8","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/5SM2745-8 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}}