{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2143-4ED0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2143-4ED0","canonicalUrl":"https://aoctrl.com/siemens/3RB2143-4ED0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2143-4ED0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB2143-4ED0 solid-state overload relay, 3-pole, adjustable trip classes 5E/10E/20E/30E, screw-type main terminals, spring-loaded aux terminals, ATEX Ex II (2) GD.","salesMarkdown":"The Siemens 3RB2143-4ED0 is a SIRIUS solid-state overload relay for three-phase motor protection. It mounts directly to a contactor (contactor mounting), so it integrates into a motor starter package on a DIN-rail or panel backplate without extra bracketry. Three poles for the main current circuit, with screw-type terminals on the power side and spring-loaded terminals on the auxiliary/control side. The auxiliary terminals accept 2x (0.25–1.5 mm²) solid or finely stranded with ferrule, which covers common control-wiring sizes. ## Trip Class Adjustability — What It Means for Motor Protection Trip class is adjustable across CLASS 5E, 10E, 20E, and 30E. That means you set the maximum time the relay allows locked-rotor current to flow before tripping — 5 seconds for fast protection (e.g., submersible pumps), 30 seconds for high-inertia loads (e.g., centrifuges or large fans). One relay covers multiple motor start profiles, reducing SKUs on the shelf. ## Environmental and Electrical Robustness Rated for 100 % relative humidity during operation, so it handles condensation-prone enclosures without derating. Shock resistance is 15g / 11 ms, typical for industrial panel vibration. Surge voltage resistance rated at 8 kV, and EMC burst immunity meets IEC 61000-4-4 severity level 3 (2 kV on power ports, 1 kV on signal ports). That means it's unlikely to nuisance-trip from switching transients on the same panel bus. Carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD, so it's approved for use in potentially explosive atmospheres — zone 2 gas and zone 22 dust applications when paired with an appropriate motor. RoHS compliance date is July 1, 2006, covering the EU directive. Dimensions: 70 mm wide, 106 mm high, 124 mm deep. Mounting position is any orientation. Clearance: 0 mm upwards, forwards, backwards, and downwards — so it can be stacked directly against adjacent devices without air gap. Side clearance is 6 mm, which is typical for finger-duct or wire-bundle routing.","metaTitle":"Siemens 3RB2143-4ED0 SIRIUS Solid-State Overload Relay, Adju","metaDescription":"Siemens 3RB2143-4ED0 SIRIUS solid-state overload relay, 3-pole, adjustable trip classes 5E/10E/20E/30E, ATEX certified, current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"124 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"70 mm","Height":"106 mm","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","Per Pole":"0.02 W","Stranded":"2x (10 ... 50 mm²), 10 ... 70 mm²","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 5E, 10E, 20E and 30E adjustable","At The Side":"6 mm","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"15g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Type Of Protection":"PTB 06 ATEX 3001 Ex II (2) GD","Product Designation":"solid-state overload relay","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"07/01/2006","at AWG cables for main contacts":"2x (10 ... 1/0), 1x (10 ... 2/0)","For Auxiliary And Control Circuit":"spring-loaded terminals","Relative Humidity During Operation":"100 %","Surge Voltage Resistance Rated Value":"8 kV","at AWG cables for auxiliary contacts":"2x (24 ... 16)","due to burst according to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Size Of Contactor Can Be Combined Company-Specific":"S3","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"0.05 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"25 ... 100 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=471559&mlfb=3RB2143-4ED0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2143-4ED0/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this relay carry?","answer":"ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for explosive atmospheres. RoHS compliant with a substance prohibition date of July 1, 2006. EMC immunity tested to IEC 61000-4-4 severity level 3."},{"question":"What are the key ratings for the 3RB2143-4ED0?","answer":"Three-pole solid-state overload relay with adjustable trip classes 5E, 10E, 20E, and 30E. Main terminals are screw-type; auxiliary terminals are spring-loaded. Surge voltage resistance is 8 kV. Operating temperature range is -25 to +60 °C."},{"question":"How is this relay mounted?","answer":"Contactor mounting — it snaps directly onto a compatible SIRIUS contactor. No additional DIN-rail bracket is needed. Mounting position is any orientation, with 0 mm clearance required in all directions except 6 mm at the side."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2143-4ED0","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/3RB2143-4ED0 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}}