{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2545-1NB30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2545-1NB30","canonicalUrl":"https://aoctrl.com/siemens/3RT2545-1NB30","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2545-1NB30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 contactor, 3RT2545-1NB30, 20-33 VDC coil, screw-type terminals, auxiliary switch, 152 mm depth, 70 mm width, 140 mm height.","salesMarkdown":"## SIRIUS S3 contactor, 20-33 VDC coil, screw terminals The Siemens 3RT2545-1NB30 is a SIRIUS-branded contactor in the S3 frame size, built for switching loads up to the rated current of its coil voltage range. The coil is rated 20-33 VDC with a pickup threshold of 0.8x rated value and a dropout of 1.1x full-scale value — meaning it pulls in reliably at 16 V and drops out above 36 V, giving clean margin on a nominal 24 VDC control bus. ## Switching capacity at common control voltages The contactor's switching current varies sharply with the load voltage — a key detail for BOM fit. At 24 VDC rated value it switches 10 A; at 48 VDC that drops to 2 A, and at 125 VDC it handles 0.9 A. These numbers define the usable load envelope, not just a single maximum. Inrush current peaks at 6.5 A, so the control transformer must be rated for that surge without voltage sag. ## Mechanical endurance and operating cycle limits Rated for 10 million mechanical operations typical, with a maximum switching rate of 900 operations per hour in AC-1 duty. The operating times are 38-57 ms for both AC and DC coil supply, and the arcing time is 10-20 ms — consistent with a standard S3 contactor designed for frequent cycling in conveyor or pump control. ## Termination, clearance, and environmental limits Main power terminals accept stranded wire from 6 mm² up to 70 mm² (single conductor) or 2x 16 mm². Auxiliary terminals take solid or stranded 0.5-2.5 mm². All are screw-type — no spring-cage option on this variant, so plan for screwdriver access during termination. Clearance requirements: 10 mm above and below, 10 mm to the side, 0 mm forward and backward. The auxiliary switch is included as standard — no separate add-on needed for basic status feedback. This means the part is still available through standard Siemens distribution channels. For volume or project-buy requirements, submit an RFQ for a firm lead-time and price-break quote.","metaTitle":"Siemens 3RT2545-1NB30 SIRIUS Contactor, S3, 20-33 VDC Coil","metaDescription":"Siemens 3RT2545-1NB30 SIRIUS S3 contactor. 20-33 VDC coil, screw terminals, aux switch included. Quoted to order. Depth 152 mm.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"70 mm","at AC":"38 ... 57 ms","at DC":"38 ... 57 ms","Height":"140 mm","Upwards":"10 mm","Forwards":"0 mm","Stranded":"2x (6 ... 16 mm²), 2x (10 ... 50 mm²), 1x (10 ... 70 mm²)","at 50 Hz":"3.1 VA","at 60 Hz":"3.1 VA","Backwards":"0 mm","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"10 mm","Rated Value":"20 ... 33 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"900 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","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":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"6.5 A","Product Designation":"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":"10 000 000","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":"6 A","at 400 V rated value":"3 A","at 440 V rated value":"1.8 A","at 50 Hz rated value":"20 ... 33 V","at 500 V rated value":"2 A","at 60 Hz rated value":"20 ... 33 V","at 600 V rated value":"0.1 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Locked-Rotor Current Peak":"6.5 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"75 mA","per NC contact rated value":"80 A","per NO contact rated value":"80 A","Of Main Circuit Rated Value":"8 kV","Substance Prohibitance (Date)":"09/01/2017","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"3.2 A","Duration Of Locked-Rotor Current":"150 ms","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gR: 250 A (690 V, 100 kA)","at 24 V per NC contact rated value":"100 A","at 24 V per NO contact rated value":"100 A","closing power of magnet coil at DC":"76 W","holding power of magnet coil at DC":"1.8 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","at 110 V per NC contact rated value":"100 A","at 110 V per NO contact rated value":"100 A","at 220 V per NC contact rated value":"7 A","at 220 V per NO contact rated value":"7 A","at 230 V per NC contact rated value":"22 kW","at 230 V per NO contact rated value":"22 kW","at 400 V per NC contact rated value":"37 kW","at 400 V per NO contact rated value":"37 kW","at 440 V per NC contact rated value":"0.42 A","at 440 V per NO contact rated value":"0.42 A","With Type Of Coordination 1 Required":"gG: 250 A (690 V, 100 kA)","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","number of NC contacts for main contacts":"2","number of NO contacts for main contacts":"2","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":"4","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","at ambient temperature 40 °C rated value":"125 A","at ambient temperature 60 °C rated value":"105 A","mirror contact according to IEC 60947-4-1":"Yes","apparent holding power of magnet coil at AC":"3.1 VA","apparent pick-up power of magnet coil at AC":"163 VA","Type Of Voltage Of The Control Supply Voltage":"AC/DC","for 3-phase AC motor at 460/480 V rated value":"30 hp","Limited To 1 S Switching At Zero Current Maximum":"1 080 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"1 080 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"851 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"538 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"423 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"1 000 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 10 A","minimum cross-section in main circuit at maximum AC-1 rated value":"50 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","AWG number as coded connectable conductor cross section for main contacts":"10 ... 2","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","power loss [W] at AC-3 at 400 V for rated value of the operational current per conductor":"5.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fb918960dd2a48789b6a44ffa1363bda.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=630097&mlfb=3RT2545-1NB30","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2545-1NB30/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RT2545-1NB30 accept on the main terminals?","answer":"Main power terminals accept stranded wire: 2x 6-16 mm², 2x 10-50 mm², or 1x 10-70 mm². All are screw-type."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2545-1NB30","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/3RT2545-1NB30 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}}