{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4651-2AA30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4651-2AA30","canonicalUrl":"https://aoctrl.com/siemens/3UG4651-2AA30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4651-2AA30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4651-2AA30 RPM monitoring relay, digital setting, LCD display, 24 V rated, 3 A at 250 V, IP20, screw and snap-on mounting.","salesMarkdown":"The Siemens 3UG4651-2AA30 is a SIRIUS RPM monitoring relay with digital setting — a dedicated speed monitor for rotating machinery, not a general-purpose multifunction relay. It tracks RPM via a sensor input and trips an output when speed deviates outside a programmed window or falls below a threshold. Rated supply is 24 V DC/AC (24... 24 V), with a maximum power draw of 2.5 VA at 24 V. The output relay is rated 3 A at 250 V AC (50/60 Hz), 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V DC — so it can directly switch small contactors or PLC inputs without an interposing relay, but for inductive loads at higher DC voltages, plan on a suppression network. The relay offers auto-reset and external reset capability, plus an error memory that latches the fault state until manually cleared — useful for remote monitoring where you need to know a speed trip occurred even if the machine has since stopped. The LCD display shows the setpoint and actual RPM, simplifying commissioning without a laptop. Initial value is 1.1 (likely a multiplier or threshold factor), and the start-up delay is adjustable from 1 to 900 seconds — critical for applications where the motor needs to reach speed before monitoring engages (e.g., conveyors, fans). Delayed switching is set to 0 (instantaneous), so the output responds immediately to an overspeed or underspeed condition.","metaTitle":"Siemens 3UG4651-2AA30 SIRIUS RPM Monitoring Relay, 24 V, 103","metaDescription":"Siemens SIRIUS 3UG4651-2AA30 RPM monitoring relay with digital setting, LCD display, auto-reset, error memory. Rated 24 V, 3 A at 250 V. IP20. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Process / Temperature Controllers"],"specifications":{"Depth":"103 mm","Solid":"24 ... 16","Width":"22.5 mm","Height":"86 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Stranded":"24 ... 16","at 125 V":"0.2 A","at 250 V":"0.1 A","Backwards":"0 mm","Downwards":"0 mm","auto-RESET":"Yes","At The Side":"0 mm","Rated Value":"24 ... 24 V","Error Memory":"Yes","Initial Value":"1.1","When Starting":"1 ... 900 s","During Storage":"-40 ... +80 °C","External Reset":"Yes","at 24 V maximum":"2.5 VA","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"0.8","Product Function":"RPM monitoring relay","Delayed Switching":"0","Mounting Position":"any","Product Brand Name":"SIRIUS","Between The Outputs":"No","Degree Of Pollution":"3","Product Designation":"Speed monitoring relay with digital setting","protection class IP":"IP20","at 250 V at 50/60 Hz":"3 A","at 50 Hz rated value":"24 ... 24 V","at 60 Hz rated value":"24 ... 24 V","for AWG cables solid":"2x (24 ... 16)","Design Of The Display":"LCD","Instantaneous Contact":"0","Standstill Monitoring":"No","for AWG cables stranded":"2x (24 ... 16)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","Measurable Line Frequency":"50 ... 60 Hz","Rotation Speed Monitoring":"Yes","Accuracy Of Digital Display":"+/- 1 Digit","Relative Metering Precision":"10 %","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"spring-loaded terminals","Design Of Input Feedback Input":"No","With Lower Or Upper Limit Violation":"0.1 ... 99.9 s","operational current at 17 V minimum":"5 mA","Surge Voltage Resistance Rated Value":"4 kV","With Degree Of Pollution 3 Rated Value":"300 V","due to burst according to IEC 61000-4-4":"2 kV","number of CO contacts delayed switching":"1","number of NC contacts delayed switching":"0","number of NO contacts delayed switching":"0","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"0.25 ... 1.5 mm²","Finely Stranded Without Core End Processing":"0.25 ... 1.5 mm²","Suitability For Use Safety-Related Circuits":"No","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","Type Of Voltage Of The Control Supply Voltage":"AC/DC","operating frequency with 3RT2 contactor maximum":"5 000 1/h","Adjustable Open/Closed-Circuit Current Principle":"Yes","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Buffering Time In The Event Of Power Failure Minimum":"10 ms","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","continuous current of the DIAZED fuse link of the output relay":"4 A","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3UG4651-2AA30/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3UG4651-2AA30?","answer":"103 mm depth, with 86 mm height and 22.5 mm width."},{"question":"What wire sizes does the 3UG4651-2AA30 accept?","answer":"Solid and stranded conductors from 24 AWG to 16 AWG (2x 24...16 for AWG solid)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4651-2AA30","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/3UG4651-2AA30 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}}