{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2027-2BM40-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2027-2BM40-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RT2027-2BM40-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2027-2BM40-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2027-2BM40-ZW97, size S0 power contactor, 220 V AC coil, spring-type terminals, AC-3 rated 750 ops/h, auxiliary switch included.","salesMarkdown":"The 3RT2027-2BM40-ZW97 is a Siemens SIRIUS size S0 power contactor with a 220 V AC coil and spring-type terminals. The AC-3 rating (motor starting, breaking under load) maxes out at 750 operating cycles per hour — that's a cycle every 4.8 seconds, which covers most pump and fan duty. If you're doing plugging or inching (AC-4 duty), the rate drops to 250 ops/h because the contactor takes more heat on each break. The coil picks up at 0.8x rated voltage (176 V for a 220 V coil) and holds in at 1.1x, so it stays latched through moderate sags. Dropout time on DC is 15 to 17.5 ms, arcing time a tight 10 ms — that tells you the arc chute does its job quickly, which matters for contact life. The spring terminals accept solid or stranded wire from 1 to 10 mm², and you can land two conductors of 0.5 to 2.5 mm² in the same clamp — handy for daisy-chaining control power. ## Mounting and clearance: what the panel needs That's minimal for a 45 mm wide device; you can pack them close if you watch the heat rise. ## Switching capability across voltages The auxiliary contacts are rated for inductive DC switching: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. At 230 V AC the contactor is rated for 5 hp motor load. These numbers matter if you're using the auxiliary for a DC brake coil or a small contactor pilot — don't assume the AC rating carries over to DC; the arc extinction is different, and the DC ratings here are the real limit. ## Mechanical endurance and operating rates The electrical operating rate depends on duty: 1,000 ops/h for resistive (AC-1), 750 ops/h for motor starting (AC-2 and AC-3), and 250 ops/h for AC-4 (inching/plugging). If your application cycles faster than these rates, the contactor can overheat internally even if the load current is within rating. Stick to the rate limits for reliable service.","metaTitle":"Siemens 3RT2027-2BM40-ZW97 SIRIUS Power Contactor, S0, 220V","metaDescription":"Siemens SIRIUS 3RT2027-2BM40-ZW97 power contactor, size S0, 220V AC coil, spring-type terminals. Rated for AC-3 motor switching at 750 ops/h. Current lifecycle. Sourced to order. R","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"107 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at DC":"15 ... 17.5 ms","Height":"102 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","Rated Value":"220 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","For Main Contacts":"18 ... 8","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":"S0","Solid Or Stranded":"2x (0.5 ... 2.5 mm²)","Product Brand Name":"SIRIUS","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":"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":"5 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"27 A","at 500 V rated value":"2 A","at 600 V rated value":"27 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"2 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 hp","at 575/600 V rated value":"25 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","Safety-Related Switching On":"Yes","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"8.1 W","at AC-2 at 400 V rated value":"15 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"22 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","at AWG cables for main contacts":"2x (18 ... 8)","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"44 A","at AC-5b up to 400 V rated value":"26.5 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)","Without Load Current Share Typical":"5.9 W","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"5.9 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)","at AWG cables for auxiliary contacts":"2x (20 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.7 W","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)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"DC","Limited To 1 S Switching At Zero Current Maximum":"499 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"395 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"260 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"186 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"152 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","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":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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=727343&mlfb=3RT2027-2BM40-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2027-2BM40-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the spring terminal accept?","answer":"The spring-type terminals accept solid or stranded wire from 1 to 10 mm², and you can land two conductors of 0.5 to 2.5 mm² in the same clamp. That covers most panel wiring from control circuits to motor leads."},{"question":"What compliance documentation is available for this contactor?","answer":"As a Siemens SIRIUS product, this contactor is designed to meet IEC 60947-4-1 and relevant UL/CSA standards for industrial control equipment. RoHS and REACH compliance documentation is standard from Siemens for current-production parts. Specific certificates (UL file, CE declaration) are available through Siemens Industry Online Support or upon request with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2027-2BM40-ZW97","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/3RT2027-2BM40-ZW97 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}}