{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2035-2QB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2035-2QB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2035-2QB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2035-2QB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2035-2QB0, CLASS 20E, 690 V AC-3 max, screw terminals, contactor mounting, ATEX Ex II (2) GD, IP00 front.","salesMarkdown":"The Siemens SIRIUS 3RB2035-2QB0 is a solid-state overload relay — CLASS 20E trip curve, rated for main circuit voltages up to 690 V AC-3. It mounts directly to a contactor, so it integrates into the same DIN-rail footprint as the contactor assembly. The front face is IP00 (open), meaning it lives inside a panel; the ATEX Ex II (2) GD certification allows installation in Zone 2 gas or Zone 22 dust hazardous areas when paired with an appropriate enclosure. CLASS 20E means the relay allows the motor to draw locked-rotor current for up to 20 seconds before tripping. If your motor has a harder start (high inertia load), you'd step up to CLASS 30; for a soft-start or VFD-fed motor, CLASS 10 or 10E is more common. This part sits in the middle of the range. Main circuit terminals are screw-type, accepting solid conductors 0.5 to 4 mm² (or 2x 0.5 to 2.5 mm²) and stranded up to 35 mm² (2x 25 mm²). AWG equivalents: 2 x max 4 AWG stranded, 1 x 18–2 AWG solid. That covers most panel wiring up to about 25 A — no compression lugs needed, just a screwdriver. ## Environmental and EMC resilience Shock rated at 15g / 11 ms, and it's immune to 2 kV bursts on power ports and 1 kV on signal ports per IEC 61000-4-4 severity level 3. Surge withstand is 6 kV. That's solid for industrial panels near contactors or drives — you won't get nuisance faults from switching transients.","metaTitle":"Siemens 3RB2035-2QB0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens 3RB2035-2QB0 SIRIUS solid-state overload relay, CLASS 20E trip, 690 V max, ATEX Ex II (2) GD. Screw terminals, contactor mount. Active production, sourced to order. Request","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":"6 ... 25 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=154443&mlfb=3RB2035-2QB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2035-2QB0/alternatives.json"},"ai":{"faq":[{"question":"What is the trip class and what does it mean?","answer":"CLASS 20E means the relay allows locked-rotor current for up to 20 seconds before tripping, suitable for standard induction motor starts on pumps, fans, and conveyors."},{"question":"What compliance documentation does this part carry?","answer":"It carries ATEX Ex II (2) GD certification (PTB 06 ATEX 3001) for use in Zone 2 gas and Zone 22 dust hazardous areas. EMC immunity is specified per IEC 61000-4-4 severity level 3. The reference code per DIN EN 81346-2 is F."},{"question":"Can I get current pricing and availability for 3RB2035-2QB0?","answer":"Pricing and availability are confirmed at quote time. Submit an RFQ through the storefront for a current quote on this active part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2035-2QB0","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/3RB2035-2QB0 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}}