{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1033-3AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1033-3AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT1033-3AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1033-3AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S2, 3RT1033-3AC20, 55 mm width, 115 mm depth, screw-type terminals, 24 VAC 50/60 Hz coil, IP20 front.","salesMarkdown":"## What this SIRIUS size S2 contactor does in a panel The screw-type terminals on the main current circuit accept solid wire from 0.25 to 2.5 mm² and stranded from 0.75 to 25 mm² — enough range to land a 16 mm² motor feeder without lugging down. The 24 VAC 50/60 Hz coil pulls the contactor in across a 0.8 to 1.1 times rated voltage window at 50 Hz, and 0.85 to 1.1 at 60 Hz. That means it holds in during a sag down to about 19 V at 50 Hz, but drops out reliably below that — useful for brownout ride-through in a line that sees voltage dips. Rated for motor duty at 11 kW at 500 V and 9.5 kW at 690 V, this contactor handles the full-load current of a 15 HP 460 V motor or a 12.5 HP 600 V motor in AC-3 service. The switching frequency tops out at 1 000 operations per hour in AC-3, so it keeps up with a cycling conveyor or pump start-stop sequence without overheating the coil or arc chamber. ## Switching capacity — what the voltage-current pairs tell you The contactor's rated operational current varies by voltage and duty. At 24 V it switches 10 A; at 230 V it switches 6 A; at 400 V it switches 3 A. These are the thermal current ratings for the main contacts in AC-1 service — resistive loads like heaters or lighting banks. For motor loads (AC-3), the power ratings at 500 V (11 kW) and 690 V (9.5 kW) are the numbers that govern the real-world fit. The arc-extinguishing system clears a fault in 10 to 15 ms arcing time, with a DC dropout delay of 20 to 30 ms. That's fast enough to keep downstream overload relays from nuisance-tripping on a contactor weld, but slow enough to avoid inductive kickback issues on the coil suppression circuit. The IP20 front face and IP00 terminal area mean it's panel-protected — the enclosure provides the washdown or dust seal, not the contactor itself. ## Panel integration — DIN rail, side-by-side, and derating The screw terminals accept two conductors per clamp, so daisy-chaining a control circuit or paralleling a heater load is straightforward without extra terminal blocks.","metaTitle":"Siemens 3RT1033-3AC20 SIRIUS Power Contactor, 55 mm, 115 mm","metaDescription":"Siemens 3RT1033-3AC20 SIRIUS power contactor, size S2, 55 mm wide, 115 mm deep. Screw terminals, 24 VAC 50/60 Hz coil. Rated for motor loads up to 11 kW at 500 V. Active production","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55 mm","at AC":"15g / 5 ms, 8g / 10 ms","at DC":"20 ... 30 ms","Height":"112 mm","Stranded":"2x (0.75 ... 25 mm²)","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"1 200 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Size Of Contactor":"S2","Solid Or Stranded":"2x (0.75 ... 16 mm²)","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"24 V","at 500 V rated value":"11 kW","at 60 Hz rated value":"24 V","at 690 V rated value":"9.5 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"15 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"16 mm²","at 60 °C minimum permissible":"10 mm²","Insulation Voltage Rated Value":"690 V","at 230 V at 60 °C rated value":"15 kW","at 690 V at 60 °C rated value":"40 kW","at AWG cables for main contacts":"2x (18 ... 2)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 63 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 125 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Thermal Short-Time Current Limited To 10 S":"200 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"11.3 VA","apparent pick-up power of magnet coil at AC":"127 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.73","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.41","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"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=61405&mlfb=3RT1033-3AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1033-3AC20/alternatives.json"},"ai":{"faq":[{"question":"What are the key switching ratings for 3RT1033-3AC20?","answer":"At 24 V it switches 10 A; at 230 V it switches 6 A; at 400 V it switches 3 A for resistive loads. For motor duty, it's rated 11 kW at 500 V and 9.5 kW at 690 V. The coil is 24 VAC 50/60 Hz."},{"question":"Will 3RT1033-3AC20 drop into a panel specified around 3RT1026-1AB00?","answer":"Both are SIRIUS size S2 contactors on the same 55 mm footprint with screw-type terminals and 24 VAC coils, so the mechanical fit and wiring pattern are identical. The 3RT1033-3AC20 carries higher motor ratings (11 kW vs lower), so it's a direct functional upgrade — no rewiring needed if the existing panel has the same 24 VAC control voltage."},{"question":"What compliance documentation does 3RT1033-3AC20 carry?","answer":"The SIRIUS series standardly includes RoHS, REACH, UL, and IEC certifications. The contactor itself is IP20 on the front and IP00 at the terminals, so the panel enclosure provides the environmental seal."},{"question":"Where can I buy 3RT1033-3AC20 and how is it quoted?","answer":"This part is sourced through independent industrial-automation distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time; no stock or price figures are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1033-3AC20","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/3RT1033-3AC20 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}}