{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4641-2CS20","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4641-2CS20","canonicalUrl":"https://aoctrl.com/siemens/3UG4641-2CS20","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4641-2CS20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3UG4641-2CS20 active power monitoring relay, 0.2-10 A adjustable, 90-690 VAC, LCD display, snap-on DIN rail mounting.","salesMarkdown":"The 3UG4641-2CS20: The adjustable current range of 0.2 to 10 A covers a wide spread of motor and load sizes — from fractional-horsepower pumps up to about 5 kW at 400 V. You set the full-scale value digitally, and the relay trips when the active power (or cos phi) deviates beyond your programmed threshold. The 90-690 VAC supply range means it works on any standard low-voltage network worldwide, including 120 V, 208 V, 240 V, 400 V, 480 V, and 600 V systems, without needing a separate control transformer. The relay output is rated 3 A at 250 VAC and 3 A at 400 VAC, which is enough to drive a contactor coil or a PLC input directly. For DC loads, derate to 1 A at 24 VDC, 0.2 A at 125 VDC, and 0.1 A at 250 VDC — those lower figures matter if you're switching a DC-powered alarm beacon or a solenoid valve. The start-up delay is adjustable from 0 to 99 seconds, which lets you ignore inrush during motor starting or compressor cycling. That's a practical feature: without it, the relay would trip on every start transient. The external reset input means you can wire a remote pushbutton to acknowledge faults without opening the panel door. Width is 22.5 mm, so it takes up one standard modular device slot — you can fit 12 of these in a 12-inch rail section. Height is 103 mm, depth 91 mm. ## Wiring and connections That's a standard control-panel range — 1.5 mm² is typical, and you can double up two conductors per terminal for daisy-chaining. The screw terminals are the cage-clamp style; strip length is around 8 mm. No special tooling required. Galvanic isolation is provided between input and output, and between the two output contacts (changeover). That means you can use the relay to switch a load on a different circuit without worrying about ground loops or shared neutrals.","metaTitle":"Siemens SIRIUS 3UG4641-2CS20 active power monitoring relay,","metaDescription":"Siemens SIRIUS 3UG4641-2CS20 active power and cos phi monitoring relay, 0.2-10 A adjustable, 90-690 VAC, IP20, snap-on DIN rail. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Process / Temperature Controllers"],"specifications":{"1":"0.2 ... 10 A","2":"0.2 ... 10 A","Depth":"91 mm","Solid":"24 ... 16","Width":"22.5 mm","Height":"103 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","At The Side":"0 mm","Initial Value":"1","When Starting":"0 ... 99 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","Full-Scale Value":"1","Product Function":"Active power monitoring relay","Mounting Position":"any","Measurable Current":"0.2 ... 10 A","Product Brand Name":"SIRIUS","Between The Outputs":"Yes","Degree Of Pollution":"3","Product Designation":"Cos phi 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","at 50 Hz rated value":"90 ... 690 V","at 60 Hz rated value":"90 ... 690 V","Design Of The Display":"LCD","at AWG cables stranded":"2x (24 ... 16)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","Accuracy Of Digital Display":"+/-1 digit","Relative Metering Precision":"10 %","Operating Voltage Rated Value":"90 ... 690 V","Overcurrent Detection 1 Phase":"Yes","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"spring-loaded terminals","Type Of Current For Monitoring":"AC","Undercurrent Detection 1 Phase":"Yes","Control Supply Voltage Rated Value":"690 ... 90","With Lower Or Upper Limit Violation":"0.1 ... 20 s","operational current at 17 V minimum":"5 mA","Supply Voltage Frequency Rated Value":"60 ... 50 Hz","Surge Voltage Resistance Rated Value":"6 kV","With Degree Of Pollution 3 Rated Value":"690 V","due to burst according to IEC 61000-4-4":"2 kV","number of CO contacts delayed switching":"2","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":"2","Finely Stranded Without Core End Processing":"0.25 ... 1.5 mm²","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","Between The Voltage Supply And Other Circuits":"Yes","Type Of Voltage Of The Control Supply Voltage":"AC","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","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","Adjustable Switching Hysteresis For Measured Current Value":"100 ... 2 000 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","Supply Voltage Frequency For Auxiliary And Control Circuit Rated Value":"50 ... 60 Hz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3UG4641-2CS20/alternatives.json"},"ai":{"faq":[{"question":"What is the measurable current range?","answer":"The adjustable current range is 0.2 to 10 A. You set the full-scale value digitally via the LCD interface."},{"question":"What supply voltage does it need?","answer":"It accepts 90 to 690 VAC at 50 or 60 Hz, covering all common low-voltage networks (120 V, 208 V, 240 V, 400 V, 480 V, 600 V)."},{"question":"What is the relay contact rating?","answer":"The output relay is rated 3 A at 250 VAC and 3 A at 400 VAC. For DC loads: 1 A at 24 VDC, 0.2 A at 125 VDC, 0.1 A at 250 VDC."},{"question":"How do I mount it?","answer":"Snap-on mounting to a 35 mm DIN rail. Width is 22.5 mm (one standard slot). Any mounting orientation is allowed. IP20 rated for indoor enclosures."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4641-2CS20","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/3UG4641-2CS20 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}}