{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3UG4825-2CA40","brand":"Siemens","brandSlug":"siemens","productSlug":"3UG4825-2CA40","canonicalUrl":"https://aoctrl.com/siemens/3UG4825-2CA40","factsUrl":"https://aoctrl.com/api/mcp/products/3UG4825-2CA40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS residual current monitoring relay, 3UG4825-2CA40, digital setting, 30 mA to 40 A measuring range, 24 V DC, IP20.","salesMarkdown":"The Siemens SIRIUS 3UG4825-2CA40 is a residual current monitoring relay with digital setting, designed for three-phase supplies. It measures residual currents from 30 mA to 40 A, covering the range from sensitive ground-fault detection up to higher leakage levels typical on larger feeders. The measuring circuit can detect currents as low as 10 mA, with a full-scale setting adjustable up to 43 A. ## Configuration and Diagnostics The relay features an error memory function and supports an external reset, allowing it to be integrated into a manual or automatic reset scheme. A delayed switching function of 2 seconds is available to avoid nuisance tripping on inrush or transient leakage. The initial value is set at 0.85 of the full-scale value, and the full-scale value is 1.1, indicating the trip threshold is adjustable within a band around the nominal setting.","metaTitle":"Siemens 3UG4825-2CA40 SIRIUS Residual Current Monitoring Rel","metaDescription":"Siemens SIRIUS 3UG4825-2CA40 residual current monitoring relay for three-phase supplies. Measures 30 mA to 40 A, 24 V DC supply, IP20. Active production. RFQ for pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Process / Temperature Controllers"],"specifications":{"1":"30 mA ... 40 A","2":"30 mA ... 40 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","Rated Value":"24 ... 24 V","Error Memory":"Yes","Initial Value":"0.85","During Storage":"-40 ... +85 °C","External Reset":"Yes","Of The Terminal":"IP20","Type Of Voltage":"DC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail","Full-Scale Value":"1.1","Of The Enclosure":"IP20","Product Function":"for three-phase supplies","Delayed Switching":"2","Mounting Position":"any","Measurable Current":"10 mA ... 43 A","Product Brand Name":"SIRIUS","Between The Outputs":"Yes","Degree Of Pollution":"3","Product Designation":"Residual 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":"0 A","Design Of The Display":"LCD","IO-Link transfer rate":"COM2 (38,4 kBaud)","For Auxiliary Contacts":"2","at AWG cables stranded":"2x (24 ... 16)","Between Input And Output":"Yes","Relative Repeat Accuracy":"1 %","Residual Current Display":"Yes","Measurable Line Frequency":"16 ... 400 Hz","temperature drift per °C":"0.1 %/°C","Accuracy Of Digital Display":"+/-1 digit","Relative Metering Precision":"5 %","Operating Voltage Rated Value":"24 ... 24 V","Overcurrent Detection 1 Phase":"Yes","Substance Prohibitance (Date)":"02/14/2013","Type Of Electrical Connection":"spring-loaded terminals","Adjustable Response Delay Time":"0 ... 999.9 s","Type Of Current For Monitoring":"AC","Undercurrent Detection 1 Phase":"No","Adjustable Operating Delay Time":"0 ... 999.9 s","Operating Frequency Rated Value":"16 ... 400 Hz","Design Of The Electrical Isolation":"galvanic isolation","operational current at 17 V minimum":"5 mA","Surge Voltage Resistance Rated Value":"4 kV","With Degree Of Pollution 3 Rated Value":"300 V","protocol is supported IO-Link protocol":"Yes","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":"0.25 ... 1.5 mm²","Finely Stranded Without Core End Processing":"0.25 mm²","Adjustable Response Delay Time When Starting":"0 ... 999.9 s","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"sinusoidal half-wave 15g / 11 ms","Between The Voltage Supply And Other Circuits":"No","Type Of Voltage Of The Control Supply Voltage":"DC","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","ampacity of the semiconductor output in SIO mode":"200 mA","Mechanical Service Life (Switching Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"4 kV contact discharge / 8 kV air discharge","Type Of Voltage Supply Via Input/Output Link Master":"Yes","Buffering Time In The Event Of Power Failure Minimum":"10 ms","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Thermal Current Of The Switching Element With Contacts Maximum":"5 A","continuous current of the DIAZED fuse link of the output relay":"4 A","Of The Address Range Of The Inputs With Cyclical Transfer Total":"4 byte","Of The Address Range Of The Outputs With Cyclical Transfer Total":"2 byte","point-to-point cycle time between master and IO-Link device minimum":"10 ms","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/3UG4825-2CA40/alternatives.json"},"ai":{"faq":[{"question":"What is the measuring range of the 3UG4825-2CA40?","answer":"The relay measures residual currents from 30 mA to 40 A, with a detectable range from 10 mA to 43 A."},{"question":"What is the supply voltage requirement?","answer":"It requires a 24 V DC control supply."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3UG4825-2CA40","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/3UG4825-2CA40 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}}