{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1105-1BE04-2CA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1105-1BE04-2CA0","canonicalUrl":"https://aoctrl.com/siemens/3RK1105-1BE04-2CA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1105-1BE04-2CA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS ASIsafe extended safety monitor, 3RK1105-1BE04-2CA0, 2 enabling circuits, IP20, screw terminals, 40 ms response time, SIL 3 / PL e / Cat 4.","salesMarkdown":"## What this safety monitor does The Siemens 3RK1105-1BE04-2CA0 is an ASIsafe extended safety monitor with 2 enabling circuits and 2 release circuits, designed to supervise safety gates, light curtains, and e-stop chains up to SIL 3 (IEC 61508), PL e (EN ISO 13849-1), and Category 4 (EN 954-1). It communicates over AS-Interface protocol, making it a drop-in safety logic controller for ASIsafe networks. The 40 ms maximum response time means the safety loop opens fast enough to meet the stopping-distance requirements of most guarded machinery. The 2 enabling circuits are the safety outputs — each is a relay that opens when the monitor detects a fault or a demand from the safety input devices. The 2 release circuits are the internal safety paths that must both be healthy before the enabling circuits can close. This dual-channel architecture is what lets the monitor achieve Category 4 / SIL 3: a single fault in either channel won't prevent the safety function from working. The AC-12 rating of 3 A at 250 V and DC-12 rating of 3 A at 24 V tell you the maximum resistive load each enabling circuit can switch — for inductive loads like contactor coils, you'll need to derate or add suppression. The 24 V control supply draw of 1 A is the total current the monitor pulls from the AS-Interface bus or auxiliary supply; budget that into your AS-i power calculation. At 45 mm wide and 120 mm deep, it occupies a single standard module width — plan for one slot in your DIN-rail layout. The IP20 finger-safe enclosure means it's suitable for inside a control cabinet only; no washdown or outdoor duty. All I/O connections use screw terminals, so have a 0.5–2.5 mm² screwdriver ready. The AS-Interface bus connection is also via screw terminals; no special AS-i flat cable required.","metaTitle":"Siemens 3RK1105-1BE04-2CA0 ASIsafe Safety Monitor, SIL 3, 2","metaDescription":"Siemens 3RK1105-1BE04-2CA0 ASIsafe extended safety monitor. 2 enabling circuits, 40ms response time, SIL 3 / PL e / Cat 4. IP20, screw terminals, AS-Interface protocol. Current lif","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"24 V":"1A","Type":"2 enabling circuits","115 V":"0.1A","230 V":"0.05A","Depth":"120mm","Width":"45mm","Height":"108mm","During Storage":"-30 ... +70°C","lifecycle_stage":"current","During Operation":"-20 ... +60°C","Fastening Method":"screws / DIN rail","DC-12 (DC-1) 24 V":"3A","Response time max.":"40ms","protection class IP":"IP20","AC-12, 50/60 Hz 250 V":"3A","Design Of The Product":"safety monitor, with expanded functionality","Number Of Release Circuits":"2","reference code according to EN 61346-2":"F","protocol is supported AS-Interface protocol":"Yes","Type Of Electrical Connection Of The Inputs And Outputs":"screw terminal"}},"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=360526&mlfb=3RK1105-1BE04-2CA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1105-1BE04-2CA0/alternatives.json"},"ai":{"faq":[{"question":"What safety level does this monitor achieve?","answer":"The 3RK1105-1BE04-2CA0 can be used up to Category 4 (EN 954-1), PL e (EN ISO 13849-1), and SIL 3 (IEC 61508). The dual-channel architecture with 2 enabling circuits and 2 release circuits supports that rating."},{"question":"What is the response time of this safety monitor?","answer":"The maximum response time is 40 ms. That's the worst-case delay from a safety input demand to the enabling circuits opening — fast enough for most guarded machine applications."},{"question":"What communication protocol does it use?","answer":"It supports the AS-Interface protocol, specifically the ASIsafe extension for safety-related data transmission over the AS-i bus."},{"question":"What are the output ratings for the enabling circuits?","answer":"Each enabling circuit is rated AC-12 at 3 A / 250 V (50/60 Hz) and DC-12 at 3 A / 24 V. These are resistive load ratings; inductive loads require derating or external suppression."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1105-1BE04-2CA0","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/3RK1105-1BE04-2CA0 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}}