{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM2845-2","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM2845-2","canonicalUrl":"https://aoctrl.com/siemens/5SM2845-2","factsUrl":"https://aoctrl.com/api/mcp/products/5SM2845-2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM2845-2, selective RCD unit for 5SY, 4-pole, type AC, In: 63 A, IΔn: 1000 mA, Un AC: 400 V.","salesMarkdown":"The Siemens 5SM2845-2 is a 4-pole selective residual-current device (RCD) from the SENTRON series, designed as an add-on unit for the 5SY miniature circuit breaker range. Selective design (type S) means it incorporates a short time delay so that downstream RCDs trip first during a fault, keeping this unit as the backup — critical for panel coordination in distribution boards where you want only the branch circuit to drop, not the whole submain. Rated at 63 A continuous. The 1000 mA residual trip threshold is for fire or equipment protection, not personnel protection. Rated insulation voltage (Ui) is 460 V, surge voltage resistance is 4 kV, and overvoltage category III — all consistent with 400 V three-phase distribution panels where it's installed downstream of the main switch. The IP20 rating (with conductors connected, in an installed distribution board) is standard for enclosed panel mount — no washdown rating here. Occupies 4 modular width units. Installation depth is 70 mm. Designed as a clip-on RCD unit for the 5SY MCB series — it's not a standalone device; it mounts to the right of the corresponding 5SY breaker and connects via the busbar and a mechanical trip link. If you're replacing a failed unit in an existing 5SY panel, this drops in without rewiring the load side. The OFF-delay is not adjustable, and the rated fault current is fixed at 1000 mA — no field tweaks. False-tripping protection is built in (suppression of nuisance trips from transient surges).","metaTitle":"Siemens 5SM2845-2 SENTRON RCD Unit, 63A 1000mA AC Selective","metaDescription":"Siemens 5SM2845-2 SENTRON selective RCD unit, 4-pole, type AC, 63 A rated current, 1000 mA fault current, 400 V AC. Current lifecycle stage, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"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":"AC","OFF-delay time adjustable":"No","For Testing Equipment Minimum":"195 V","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"top or bottom","Rated Fault Current Adjustable":"No","Protection Function False Tripping":"Yes","Tripping Fault Current Rated Value":"1 000 mA","insulation voltage (Ui) rated value":"460 V","Surge Voltage Resistance Rated Value":"4 000 V","Value Range Of The Operating Frequency":"50 Hz","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/ed6c9ae46f38f3bdf200f92fe55a2666.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=127599&mlfb=5SM2845-2","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM2845-2/alternatives.json"},"ai":{"faq":[{"question":"What is 5SM2845-2 used for?","answer":"It's a selective (time-delayed) 4-pole RCD unit for 400 V AC distribution boards, rated 63 A with a 1000 mA residual trip. It mounts alongside a 5SY series MCB to provide earth-fault protection on feeder circuits where coordination with downstream RCDs is required."},{"question":"Will 5SM2845-2 fit in a panel built for 5SL4363-7?","answer":"No direct drop-in. The 5SL4363-7 is a 3-pole miniature circuit breaker, while the 5SM2845-2 is a 4-pole RCD unit designed to clip onto a 5SY MCB. They serve different functions and have different footprints (4 MW vs 3 MW). The panel would need rewiring and a different busbar arrangement."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM2845-2","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/5SM2845-2 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}}