{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG5651-1CW31","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG5651-1CW31","canonicalUrl":"https://aoctrl.com/siemens/3UG5651-1CW31","factsUrl":"https://aoctrl.com/api/mcp/products/3UG5651-1CW31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG5 series digital speed monitoring relay, 3UG5651-1CW31, 0.1–2200 r/min, 24–240 V AC/DC, 2 changeover contacts, screw terminal, SIL 1/PL c.","salesMarkdown":"The Siemens 3UG5651-1CW31 is a digital monitoring relay from the SIRIUS 3UG5 family, purpose-built for speed monitoring of rotating machinery. Supply voltage is universal — 24 to 240 V AC/DC, 50/60 Hz — so it works across control voltages without a separate power supply module. Both ON delay and tripping delay are adjustable from 0.1 to 999.9 s, which gives you time to handle start-up transients or brief load dips without nuisance trips. Outputs are two changeover contacts (2 C/O) via screw terminals, rated for general-purpose switching. The relay carries a SIL 1 / PL c functional safety classification, meaning it can be used in low-risk safety-related applications where a single fault is tolerable. RoHS compliance is effective from 01 June 2023, and the part contains lead above 0.1% w/w (CAS 7439-92-1) per REACH Article 33, which is typical for electronic components with solder joints. No special export restrictions apply (AL: N / ECCN: N). The 0.1–2200 r/min range covers everything from slow conveyor shafts to moderate-speed fans and spindle drives. If your application runs below 0.1 r/min (e.g., a very slow agitator) or above 2200 r/min (high-speed centrifuge), this relay will not pick up the signal — you would need a different sensor or a higher-range model. The universal supply (24–240 V AC/DC) means you can wire it directly to a 24 VDC PLC output or a 230 VAC control transformer without a separate power module. Just confirm the supply is within that range and clean; the relay handles both AC and DC internally. Adjustable ON delay and tripping delay (0.1–999.9 s) let you mask start-up acceleration and brief load variations. For example, a conveyor that takes 5 seconds to reach full speed can have an ON delay set to 6 s, preventing an undershoot alarm during ramp-up. ## Mounting and wiring note Screw terminals accept solid or stranded wire; strip length and torque follow standard Siemens terminal practice (typically 7 mm strip, 0.5–0.6 Nm). The two changeover contacts are electrically isolated from the input circuit, so you can wire them to separate control systems (e.g., one contact to the PLC, the other to a warning light) without cross-talk.","metaTitle":"Siemens 3UG5651-1CW31 Speed Monitoring Relay, 0.1–2200 r/min","metaDescription":"Siemens 3UG5651-1CW31 digital speed monitoring relay, 0.1–2200 r/min, 24–240 V AC/DC, 2 changeover contacts, SIL 1/PL c. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"title":"3UG5651-1CW31","Group Code":"R711","description":"digital monitoring relay speed monitoring from 0.1 to 2200 r/min overshoot and undershoot supply voltage 24... 240 V AC/DC, 50.. 60 Hz ON delay and tripping delay 0.1..999.9 s 2 changeover contacts screw terminal SIL 1/PL c","Product Group":"5885","Product class":"A: Standard product which is a stock item could be returned within the returns guidelines/period.","Quantity Unit":"1 Piece","Product Family":"Speed monitoring","lifecycle_stage":"current","Packaging Quantity":"1","Export Control Regulations":"AL : N / ECCN : N","Packaging dimensions (L x W x H)":"127.00 x 111.00 x 38.00 mm","Compliance with the substance restrictions according to RoHS directive":"Since: 01-06-23","REACH Art. 33 Duty to inform according to the current list of candidates":"Lead CAS-No. 7439-92-1 > 0,1 % (w / w)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/742680a0466834e66637e5ac84410208.pdf","sourceUrl":"https://sieportal.siemens.com/en-ae/products-services/detail/3UG5651-1CW31?tree=CatalogTree"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for this relay?","answer":"RoHS compliance is effective from 01 June 2023. The part contains lead above 0.1% w/w (CAS 7439-92-1) per REACH Article 33. No special export restrictions apply (AL: N / ECCN: N)."},{"question":"What is the speed range and how do I set the delays?","answer":"The relay monitors from 0.1 to 2200 r/min. Both ON delay and tripping delay are adjustable from 0.1 to 999.9 s via front-panel potentiometers or DIP switches (depending on variant)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG5651-1CW31","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/3UG5651-1CW31 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}