{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2035-2UB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2035-2UB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2035-2UB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2035-2UB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2035-2UB0, CLASS 20E trip class, contactor mounting, screw-type terminals, ATEX Ex II (2) GD, 109 mm depth.","salesMarkdown":"The Siemens 3RB2035-2UB0 is a SIRIUS solid-state overload relay — a CLASS 20E device that provides motor overload and phase-loss protection without the thermal lag of a bimetal strip. It mounts directly onto a contactor, saving DIN-rail space in the panel. The CLASS 20E trip curve means it allows a 20-second cold start at 600% of the full-load current setting before tripping — a good match for standard induction motors driving pumps, fans, or conveyors that don't need the faster CLASS 10 curve. Its ATEX certification (PTB 06 ATEX 3001 Ex II (2) GD) qualifies it for use in Zone 22 dust atmospheres and Zone 2 gas atmospheres when paired with an appropriate contactor and enclosure — a detail that matters for grain handling, chemical blending, or any area with combustible dust. This relay is designed for contactor mounting — it snaps onto the bottom of a SIRIUS contactor, eliminating a separate DIN-rail footprint. The 55 mm width and 92 mm height match the contactor envelope; the 109 mm depth accounts for the relay body extending below the contactor. Screw-type terminals on the main current circuit accept 1 to 35 mm² stranded or 2x up to 25 mm² stranded wire; the control circuit (auxiliary contacts) uses 0.5 to 4 mm² solid or 2x 0.5 to 2.5 mm² stranded. Strip and torque per the terminal markings on the device. The relay provides no built-in auxiliary contacts (0 auxiliary contacts), so all status signaling must come from the contactor's own auxiliary blocks or an external monitoring relay. This is typical for a solid-state overload relay — the trip signal is internal to the contactor coil circuit. For the contactor coil circuit, the relay's internal switching capacity is rated at 2 A at 24 V DC, 4 A at 120 V AC, and 3 A at 230 V AC — these are the maximum currents the relay can interrupt when signaling a trip. Ensure the contactor coil draw stays under these values.","metaTitle":"Siemens 3RB2035-2UB0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens 3RB2035-2UB0 SIRIUS solid-state overload relay, CLASS 20E trip curve, contactor-mount design, ATEX Ex II (2) GD, screw terminals. Sourced to order; request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"109 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"55 mm","Height":"92 mm","Maximum":"2 000 m","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","Stranded":"2x (max. 25 mm²), 1 ... 35 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 20E","At The Side":"6 mm","On The Front":"IP00","Mounting type":"Contactor mounting","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","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 Auxiliary Contacts":"0","For Main Current Circuit":"screw-type terminals","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"0.05 W","Relative humidity during operation":"100 %","due to burst acc. to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","at AWG conductors for main contacts":"2 x (max. 4), 1 x (18 ... 2)","Surge voltage resistance rated value":"6 kV","Reference code acc. to DIN EN 81346-2":"F","at AC in hot operating state per pole":"0.02 W","With Degree Of Pollution 3 Rated Value":"690 V","Finely Stranded With Core End Processing":"0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (20 ... 14)","For Auxiliary And Control Current Circuit":"screw-type terminals","Number of NC contacts for auxiliary contacts":"1","Number of NO contacts for auxiliary contacts":"1","Electrostatic discharge acc. to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Size of contactor can be combined company-specific":"S2","due to conductor-earth surge acc. to IEC 61000-4-5":"2 kV (line to earth) corresponds to degree of severity 3","Removable Terminal For Auxiliary And Control Circuit":"Yes","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A","Adjustable pick-up value current of the current-dependent overload release":"12.5 ... 50 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=36225&mlfb=3RB2035-2UB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2035-2UB0/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RB2035-2UB0?","answer":"Submit an RFQ through the storefront. Pricing and stock are confirmed at quote time through independent distribution channels; the part is sourced to order."},{"question":"What is 3RB2035-2UB0's trip class and what does it mean?","answer":"The trip class is CLASS 20E, meaning the relay allows a 20-second cold start at 600% of the full-load current setting before tripping. This suits standard induction motors driving pumps, fans, or conveyors."},{"question":"Will 3RB2035-2UB0 drop into a panel that was specified around 3RU2116-1FC1 without rewiring?","answer":"No, the 3RB2035-2UB0 is a solid-state overload relay with a CLASS 20E curve and contactor-mount design, while the 3RU2116-1FC1 is a bimetal overload relay with a CLASS 10 curve. They are not form-fit-function interchangeable — the trip curve, mounting interface, and wiring differ. A panel designed for the bimetal relay would require re-evaluation of the motor protection settings and possibly the contactor interface."},{"question":"What compliance documentation does this brand provide for 3RB2035-2UB0?","answer":"The relay carries ATEX certification PTB 06 ATEX 3001 Ex II (2) GD for use in Zone 22 dust and Zone 2 gas atmospheres. It also meets IEC standards for surge voltage resistance (6 kV) and burst immunity (2 kV power ports, 1 kV signal ports per IEC 61000-4-4, severity level 3). RoHS and REACH compliance documentation is typically available from Siemens upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2035-2UB0","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/3RB2035-2UB0 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}}