{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4501-1AW30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4501-1AW30","canonicalUrl":"https://aoctrl.com/siemens/3UG4501-1AW30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4501-1AW30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4501-1AW30 level monitoring relay, analog setting, 24-240 V AC/DC supply, 3 A switching at 250 V, screw and snap-on mounting, IP20.","salesMarkdown":"## Product Overview The Siemens 3UG4501-1AW30 is a SIRIUS level monitoring relay with analog setting, designed to detect conductive liquid levels in tanks, wells, or sumps. It operates on a universal supply of 24 to 240 V AC/DC, making it suitable for both control and industrial power circuits without needing a separate power supply module. The relay's output contacts are rated 3 A at 250 V or 400 V at 50/60 Hz, sufficient for direct switching of small pumps, solenoid valves, or alarm indicators. For DC loads, the contact rating drops to 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V — a typical derating curve for a general-purpose relay. ## Key Ratings and Their Meaning The supply voltage range of 24 to 240 V AC/DC covers common control voltages worldwide — 24 V DC for PLC-driven panels, 110 V AC for North American installations, and 230/240 V AC for European mains. This eliminates the need for a dedicated transformer or voltage selector. The relay's switching capacity of 3 A at 250 V AC (resistive) is adequate for pilot-duty loads such as contactor coils or indicator lamps. For motor loads, use the contactor's own coil, not the relay directly — the relay is a signal-level device, not a motor starter. The adjustable start-up delay (0.5 to 10 s) and the configurable response threshold (0.85 to 1.1 times the set point) allow the relay to ignore transient splashes or turbulence in the tank, preventing nuisance cycling of the pump. An external reset input enables remote or automatic restart after a fault, which is useful for unattended pumping stations or remote sump installations. Wiring connections accept 2 x (20-14 AWG) solid or stranded conductors, which covers standard panel wire sizes. The spring-cage terminals (implied by the fastening method) provide vibration-resistant connections.","metaTitle":"Siemens 3UG4501-1AW30 SIRIUS Level Monitoring Relay, 24-240","metaDescription":"Siemens 3UG4501-1AW30 SIRIUS level monitoring relay. Rated 24-240 V AC/DC, 3 A at 250 V. Screw/snap-on mounting, 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":"91 mm","Solid":"20 ... 14","Width":"22.5 mm","Height":"92 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Stranded":"20 ... 14","at 125 V":"0.2 A","at 250 V":"0.1 A","Backwards":"0 mm","Downwards":"0 mm","At The Side":"0 mm","Rated Value":"24 ... 240 V","Initial Value":"0.85","When Starting":"0.5 ... 10 s","During Storage":"-40 ... +80 °C","External Reset":"Yes","at 24 V maximum":"2 VA","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"screw and snap-on mounting","Full-Scale Value":"1.1","Product Function":"Monitoring relay for level monitoring","at 240 V maximum":"4 VA","Delayed Switching":"1","Mounting Position":"any","Product Brand Name":"SIRIUS","Between The Outputs":"No","Degree Of Pollution":"3","Product Designation":"Level monitoring relay with analog setting","at AWG cables solid":"2x (20 ... 14)","display version LED":"Yes","protection class IP":"IP20","at 250 V at 50/60 Hz":"3 A","at 400 V at 50/60 Hz":"3 A","at 50 Hz rated value":"24 ... 240 V","at 60 Hz rated value":"24 ... 240 V","at AWG cables stranded":"2x (20 ... 14)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","Adjustable Responsiveness":"Yes","temperature drift per °C":"1 %/°C","Inlet Monitoring Adjustable":"Yes","Relative Metering Precision":"20 %","Outlet Monitoring Adjustable":"Yes","Physical Measuring Principle":"conductive","Of The Control Supply Voltage":"AC/DC","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"screw-type terminals","With Lower Or Upper Limit Violation":"0.5 ... 10 s","operational current at 17 V minimum":"5 mA","Surge Voltage Resistance Rated Value":"4 kV","due to burst according to IEC 61000-4-4":"2 kV","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":"0.5 ... 2.5 mm²","Tightening Torque With Screw-Type Terminals":"0.8 ... 1.2 N·m","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","operating frequency with 3RT2 contactor maximum":"5 000 1/h","vibration resistance according to IEC 60068-2-6":"1 ... 6 Hz: 15 mm, 6 ... 500 Hz: 2g","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":"200 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/3UG4501-1AW30/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this level relay?","answer":"Supply voltage 24-240 V AC/DC; output contacts rated 3 A at 250 V AC (resistive); adjustable start-up delay 0.5-10 s; threshold adjustable 0.85-1.1 times set point; IP20; operating temperature -25 to +60 °C."},{"question":"Can this relay be used for direct pump control?","answer":"It can switch small pumps or solenoid valves within its contact rating (3 A at 250 V AC). For larger motor loads, use the relay to energize a contactor coil rather than switching the motor directly."},{"question":"What is the mounting method and dimensions?","answer":"Screw and snap-on mounting onto a DIN rail. Dimensions: 22.5 mm wide, 92 mm high, 91 mm deep. Mountable in any orientation."},{"question":"Does this relay support an external reset?","answer":"Yes, it has an external reset input for remote or automatic restart after a fault condition."},{"question":"What compliance documentation is available?","answer":"The part carries CE marking and is designed to meet relevant IEC/EN standards. RoHS and REACH declarations are available from Siemens. Specific certificates (UL, CSA) should be confirmed per the official Siemens documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4501-1AW30","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/3UG4501-1AW30 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}}