{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4621-2AW30","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4621-2AW30","canonicalUrl":"https://aoctrl.com/siemens/3UG4621-2AW30","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4621-2AW30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4621-2AW30, current monitoring relay with digital setting, 0.003–0.5 A, 22.5 mm, snap-on mounting, IP20.","salesMarkdown":"## Product Overview The Siemens 3UG4621-2AW30 is a SIRIUS current monitoring relay with digital setting, designed to monitor AC or DC current in the range of 0.003 to 0.5 A (measurable up to 0.6 A). It provides an adjustable trip threshold and a configurable start-up delay of 0.1 to 20 seconds, with auto-reset or external reset capability. The relay operates on a wide supply voltage range of 20.4 to 264 V AC (50/60 Hz) or DC, making it suitable for global control panels without a separate power supply module. Its output contacts are rated 3 A at 250 V or 400 V AC, sufficient for signaling to a PLC or direct switching of small loads. The 0.003–0.5 A current range covers low-level monitoring for motor protection, heater current, or small transformer loads. The measurable current extends to 0.6 A, providing headroom for applications near the upper limit. For a sourcing decision: if your protected load draws less than 3 mA, this relay will not detect it; if it exceeds 0.6 A, you need a higher-range unit. Pollution degree 3 confirms suitability for industrial atmospheres with conductive contamination. The LCD display shows the actual current value and trip settings, aiding commissioning and fault finding without a separate meter. Any mounting position is permitted. The 22.5 mm width and 94 mm height with 91 mm depth leave clearance for adjacent devices. The relay provides galvanic isolation between input and output and between outputs, which is critical for maintaining separation between control and monitored circuits in a panel. The 1 A at 24 V DC contact rating is sufficient for PLC digital inputs; at 125 V DC it drops to 0.2 A, and at 250 V DC to 0.1 A — note the DC derating if switching DC loads.","metaTitle":"Siemens 3UG4621-2AW30 SIRIUS Current Monitoring Relay, 0.003","metaDescription":"Siemens 3UG4621-2AW30 SIRIUS current monitoring relay, adjustable 0.003–0.5 A, digital LCD, snap-on 22.5 mm, IP20. 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":"24 ... 16","Width":"22.5 mm","Height":"94 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","at 50 Hz":"20.4 ... 264 V","at 60 Hz":"20.4 ... 264 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 (24 ... 16)","protection class IP":"IP20","at 250 V at 50/60 Hz":"3 A","at 400 V at 50/60 Hz":"3 A","Design Of The Display":"LCD","at AWG cables stranded":"2x (24 ... 16)","supply voltage 1 at DC":"20.4 ... 264 V","Between Input And Output":"Yes","For Main Current Circuit":"spring-loaded 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 ... 240 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":"spring-loaded terminals","Design Of The Electrical Isolation":"Protective separation","Voltage Window Recognition 1 Phase":"No","Voltage Window Recognition 3 Phase":"No","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":"0.25 ... 1.5 mm²","Number Of Poles For Main Current Circuit":"1","Finely Stranded Without Core End Processing":"0.25 ... 1.5 mm²","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":"Yes","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 (Operating 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/3UG4621-2AW30/alternatives.json"},"ai":{"faq":[{"question":"What is the current monitoring range of the 3UG4621-2AW30?","answer":"The adjustable monitoring range is 0.003 to 0.5 A, with a measurable current capability up to 0.6 A."},{"question":"What supply voltage does the 3UG4621-2AW30 require?","answer":"It accepts 20.4 to 264 V AC at 50/60 Hz or DC, covering common control voltages from 24 V to 240 V without needing a separate power supply."},{"question":"Does the 3UG4621-2AW30 have an auto-reset function?","answer":"Yes, it supports both auto-reset and external reset, configurable via the digital settings."},{"question":"What is the physical size and mounting of the 3UG4621-2AW30?","answer":"It is 22.5 mm wide, 94 mm high, and 91 mm deep, designed for snap-on mounting on a DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4621-2AW30","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/3UG4621-2AW30 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}}