{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2035-1SB30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2035-1SB30","canonicalUrl":"https://aoctrl.com/siemens/3RT2035-1SB30","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2035-1SB30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2035-1SB30 power contactor, size S2, 21-33 VDC coil, screw-type terminals, 55 mm wide, 130 mm deep, MTBF 52 a.","salesMarkdown":"It mounts on 35 mm DIN rail per DIN EN 60715 via screw or snap-on fastening, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward and backward — handy when you're squeezing it into a tight enclosure. Rated coil voltage is 21-33 V DC, with a pickup threshold of 0.8 x rated value (about 16.8 V) and a dropout around 0.1 x rated value (roughly 2.1 V). Inrush current peaks at 2.2 A, holding power at 2 VA on 50/60 Hz. That's a standard DC coil draw — plan your 24 VDC supply to handle the inrush if you're ganging several contactors. The 55 mm width and 130 mm depth are standard for the S2 frame — check your DIN-rail clearance and door swing before committing. Mechanical life is typical at 5 million operations, and the listed MTBF is 52 years — a reliability figure that assumes proper derating and clean power. For a contactor in a pump panel cycling a few times an hour, that's a solid baseline. The main contacts are rated for switching frequencies up to 1000 cycles/hour under AC-1, AC-3, and AC-3e duty, 750 cycles/hour under AC-2, and 300 cycles/hour under AC-4. That means it's comfortable in conveyor and fan duty (AC-3) but you'll want to derate for heavy jogging or inching (AC-4). Auxiliary contacts are built in — the main contact block carries 1 NO + 1 NC configuration (18 to 1). That's enough for a feedback signal or a holding circuit without an add-on block. Screw-type terminals on the magnet coil accept 2 x (0.5 to 1.5 mm²) or 2 x (0.75 to 2.5 mm²) solid or stranded wire. That's typical for control wiring — no special crimp tool needed, but use ferrules on stranded for a reliable connection. Those are the minimum air gaps for arc flash and heat dissipation.","metaTitle":"Siemens 3RT2035-1SB30 SIRIUS Power Contactor, S2, 21-33 VDC","metaDescription":"Siemens SIRIUS 3RT2035-1SB30 power contactor, size S2, 21-33 VDC coil, screw terminals, 55 mm wide, MTBF 52 a. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"MTBF":"52 a","Depth":"130 mm","Width":"55 mm","at AC":"30 ... 55 ms","at DC":"30 ... 55 ms","Height":"114 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"2 VA","at 60 Hz":"2 VA","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"6 mm","Rated Value":"21 ... 33 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.1","at AC-3e maximum":"1 000 1/h","For Main Contacts":"18 ... 1","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S2","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"2.2 A","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"5 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"7.5 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"40 A","at 50 Hz rated value":"21 ... 33 V","at 500 V rated value":"2 A","at 60 Hz rated value":"21 ... 33 V","at 600 V rated value":"41 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"3 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"15 hp","at 460/480 V rated value":"30 hp","at 575/600 V rated value":"40 hp","Locked-Rotor Current Peak":"2.6 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"0.075 A","Of Main Circuit Rated Value":"6 kV","Safe failure fraction (SFF)":"96 %","Safety-Related Switching On":"No","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"6.6 W","at AC-2 at 400 V rated value":"18.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"35 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"01/29/2021","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"100 µs","Locked-Rotor Current Mean Value":"1.6 A","Duration Of Locked-Rotor Current":"230 ms","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"52.8 A","at AC-5b up to 400 V rated value":"33.2 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 80A (690V,100kA), aM: 50A (690V,100kA), BS88: 63A (415V,80kA)","Without Load Current Share Typical":"2 W","closing power of magnet coil at DC":"40 W","holding power of magnet coil at DC":"1.6 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 160 A (690 V, 100 kA), aM: 80 A (690 V, 100 kA), BS88: 125 A (415 V, 80 kA)","category according to EN ISO 13849-1":"2","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","stop category according to EN 60204-1":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","voltage at PLC-control input rated value":"24 V","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Recovery Time After Power Failure Typical":"2.1 s","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","safety device type according to IEC 61508-2":"Type B","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC/DC","hardware fault tolerance according to IEC 61508":"0","Limited To 1 S Switching At Zero Current Maximum":"843 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"596 A; Use minimum cross-section acc. to AC-1 rated value","PFHD with high demand rate according to EN 62061":"7.7E-8 1/h","Limited To 10 S Switching At Zero Current Maximum":"400 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"241 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"196 A; Use minimum cross-section acc. to AC-1 rated value","SIL Claim Limit (subsystem) according to EN 62061":"2","PFDavg with low demand rate according to IEC 61508":"0.0067","performance level (PL) according to EN ISO 13849-1":"c","type of PLC-control input according to IEC 60947-1":"Type 1","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"5 000 000","operating range factor of the voltage at PLC-control input":"0.8 ... 1.1","Diagnostics Test Interval By Internal Test Function Maximum":"28 800 s","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"16 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","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":"https://cdn.aoctrl.com/f87981e17aad95ad6607a69082166471.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1413414&mlfb=3RT2035-1SB30","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2035-1SB30/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RT2035-1SB30?","answer":"The 3RT2028-1BB40 is a smaller-frame SIRIUS contactor (S0 vs S2), so it won't directly swap without checking current ratings and physical fit. The 3RT2037-1AF00-ZX95 is a larger S2 variant with a different coil voltage. Neither is a drop-in substitute — verify your load and coil voltage against the spec before substituting."},{"question":"What is the MTBF of the 3RT2035-1SB30?","answer":"The listed MTBF is 52 years, based on typical operating conditions and proper derating."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2035-1SB30","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/3RT2035-1SB30 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}}