{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4621-1AA30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4621-1AA30","canonicalUrl":"https://aoctrl.com/siemens/3UG4621-1AA30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4621-1AA30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4621-1AA30 current monitoring relay, digital setting, LCD display, 0.003–0.5 A range, 24 V AC/DC supply, snap-on DIN rail.","salesMarkdown":"The Siemens 3UG4621-1AA30 is a SIRIUS current monitoring relay with digital setting and an LCD display, designed to monitor AC or DC current in a 0.003 to 0.5 A range (measurable up to 0.6 A). It snaps onto a standard DIN rail (22.5 mm width) and operates on a 24 V AC/DC control supply (20.4–26.4 V at 50/60 Hz). The relay provides one changeover contact rated 3 A at 250 V or 400 V AC, and lower ratings for DC loads (1 A at 24 V, 0.2 A at 125 V, 0.1 A at 250 V). The 0.003–0.5 A sensing range covers small motor loads, heater circuits, or pump monitoring where you need to detect undercurrent (belt slip, dry running) or overcurrent (jammed rotor). The adjustable start-up delay (0.1–20 s) lets you ride through inrush without nuisance tripping — set it longer for high-inertia loads. Auto-reset and external reset options give flexibility for unattended restart or manual lockout after a fault. IP20 protection means it's for dry indoor panels only — no washdown, no dust. Accepts two conductors per terminal — solid or stranded 20–14 AWG (0.5–2.5 mm²). The 22.5 mm width means it takes one standard module slot; plan for 91 mm depth behind the panel. Terminal screws are captive, and the LCD gives local readout of actual current and trip settings.","metaTitle":"Siemens 3UG4621-1AA30 SIRIUS Current Monitoring Relay, 0.003","metaDescription":"Siemens SIRIUS 3UG4621-1AA30 current monitoring relay with LCD display, adjustable 0.003–0.5 A range, IP20, snap-on DIN rail. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Process / Temperature Controllers"],"specifications":{"1":"0.003 ... 0.5 A","2":"0.003 ... 0.5 A","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","at 50 Hz":"20.4 ... 26.4 V","at 60 Hz":"20.4 ... 26.4 V","Backwards":"0 mm","Downwards":"0 mm","auto-RESET":"Yes","At The Side":"0 mm","When Starting":"0.1 ... 20 s","During Storage":"-40 ... +85 °C","External Reset":"Yes","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"snap-on mounting","Product Function":"Current monitoring relay","Mounting Position":"any","Measurable Current":"0.003 ... 0.6 A","Product Brand Name":"SIRIUS","Between The Outputs":"Yes","Degree Of Pollution":"3","Product Designation":"Current monitoring relay with digital setting","at AWG cables solid":"2x (20 ... 14)","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 V","at 60 Hz rated value":"24 V","Design Of The Display":"LCD","at AWG cables stranded":"2x (20 ... 14)","supply voltage 1 at DC":"20.4 ... 26.4 V","Between Input And Output":"Yes","For Main Current Circuit":"screw-type terminals","Relative Repeat Accuracy":"1 %","overcurrent detection DC":"Yes","Measurable Line Frequency":"40 ... 500 Hz","temperature drift per °C":"0.1 %/°C","undercurrent detection DC":"Yes","Accuracy Of Digital Display":"+/-1 digit","Relative Metering Precision":"5 %","Operating Voltage Rated Value":"24 ... 24 V","Overcurrent Detection 1 Phase":"Yes","Overcurrent Detection 3 Phase":"No","Substance Prohibitance (Date)":"05/01/2012","current window recognition DC":"Yes","Type Of Current For Monitoring":"AC/DC","Undercurrent Detection 1 Phase":"Yes","Undercurrent Detection 3 Phases":"No","For Auxiliary And Control Circuit":"screw-type terminals","Design Of The Electrical Isolation":"Protective separation","Voltage Window Recognition 1 Phase":"No","Voltage Window Recognition 3 Phase":"No","supply voltage 1 at DC rated value":"24 V","With Lower Or Upper Limit Violation":"0.1 ... 20 s","operational current at 17 V minimum":"0.005 A","Surge Voltage Resistance Rated Value":"4 kV","Between Control And Auxiliary Circuit":"300 V","Type Of Voltage Of The Supply Voltage":"AC/DC","With Degree Of Pollution 3 Rated Value":"690 V","Between Auxiliary And Auxiliary Circuit":"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":"0.5 ... 2.5 mm²","Number Of Poles For Main Current Circuit":"1","Tightening Torque With Screw-Type Terminals":"0.8 ... 1.2 N·m","Internal Resistance Of The Measuring Circuit":"500 mΩ","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","Between The Voltage Supply And Other Circuits":"No","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","Adjustable Open/Closed-Circuit Current Principle":"Yes","Mechanical Service Life (Switching Cycles) Typical":"10 000 000","Relative Temperature-Related Measurement Deviation":"5 %","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","Product Component Removable Terminal For Main Circuit":"Yes","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Adjustable Switching Hysteresis For Measured Current Value":"0.1 ... 250 mA","Thermal Current Of The Switching Element With Contacts Maximum":"5 A","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/3UG4621-1AA30/alternatives.json"},"ai":{"faq":[{"question":"What is the adjustable current range on this relay?","answer":"The sensing range is 0.003 to 0.5 A, with a measurable maximum of 0.6 A. The start-up delay is adjustable from 0.1 to 20 seconds."},{"question":"What supply voltage does it need?","answer":"It operates on 24 V AC/DC, with a tolerance of 20.4 to 26.4 V at both 50 Hz and 60 Hz."},{"question":"Does it have auto-reset or external reset capability?","answer":"Yes, both auto-reset and external reset are supported, giving flexibility for different restart strategies after a fault."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4621-1AA30","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/3UG4621-1AA30 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}}