{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2027-1AB04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2027-1AB04","canonicalUrl":"https://aoctrl.com/siemens/3RT2027-1AB04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2027-1AB04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2027-1AB04, S0 frame, 27 A at 480 V AC-3, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"It mounts on a 35 mm DIN rail per DIN EN 60715, with either screw or snap-on fastening, and fits into the standard S0 panel footprint at 45 mm wide by 85 mm tall by 141 mm deep. At 230 V it carries a 5 hp motor rating, which is the figure a North American panel builder will check first for a pump or small conveyor. The switching frequency tells you how hard you can push it: 750 cycles per hour maximum in AC-3 (motor) duty, and 1 000 cycles per hour in AC-1 (resistive) duty. For heavy jogging or plugging (AC-4), the limit drops to 250 cycles per hour — that's the number that governs a reversing or inching application. The 27 A at 480 V AC-3 rating is the headline number for motor switching, but the AC-1 resistive rating (not explicitly listed as a current value in the evidence) governs heater or lighting loads. The mechanical life of 10 million operations is typical for this class — the electrical life will be lower under full-load switching and depends on the duty cycle you run. Wire range is 1 to 10 mm² solid or stranded for the power circuit, with the coil terminals using screw-type connections accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). No built-in auxiliary switch — if you need a mirror contact or a status feedback to the PLC, you'll add a side-mount auxiliary contact block. The S0 frame has a standard auxiliary slot that accepts the full SIRIUS range of add-on blocks. ## Integration notes That's the minimum air gap to adjacent metalwork or another contactor — factor it into your DIN-rail layout if you're stacking multiple units side by side. Arcing time is 4 to 16 ms at AC, with a typical value around 10 ms. That's relevant for coordination with upstream short-circuit protection — the let-through energy during arcing determines whether a fast semiconductor fuse or a standard motor circuit protector is the right choice. Coil operating frequency is 50 Hz at 0.25 A (likely the holding current). The coil terminals are screw-type, so no special tooling needed for termination.","metaTitle":"Siemens SIRIUS 3RT2027-1AB04 Power Contactor, S0 Frame, 27 A","metaDescription":"Siemens SIRIUS 3RT2027-1AB04 power contactor, S0 frame size. Rated 27 A at 480 V AC-3, 5 hp at 230 V. Screw/snap-on 35 mm DIN rail mount. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"141 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at AC":"4 ... 16 ms","title":"3RT2027-1AB04","Height":"85 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","at 50 Hz":"0.25","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","description":"power contactor, AC-3e/AC-3, 32 A, 15 kW / 400 V, 3-pole, 24 V AC, 50 Hz, auxiliary contacts: 2 NO + 2 NC, screw terminal, size: S0, removable auxiliary switch","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":"750 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","at AC-3e maximum":"750 1/h","For Main Contacts":"16 ... 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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"6 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 50 Hz rated value":"24 V","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":"screw-type 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","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"6.3 W","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","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":"screw-type 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":"9.8 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.3 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","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","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 %","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC","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":"341 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":"199 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"162 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / Q600","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":"10 000 000","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":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9d4d6432cba08cfc647d8dabc52ff467.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=488554&mlfb=3RT2027-1AB04"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 3RT2027-1AB04?","answer":"The 3RT2027-1AK64-3MA0 is a peer in the same S0 frame size, but it carries a different coil voltage and may include an auxiliary switch. The 3RT2027-1AF00 and 3RT2027-1AC20 are also S0-frame siblings with different coil ratings. All share the same mounting footprint and power circuit ratings, so swapping between them requires only verifying the coil voltage matches your control circuit."},{"question":"What is the depth of the 3RT2027-1AB04?","answer":"The depth is 141 mm. Combined with the 45 mm width and 85 mm height, it fits the standard S0 contactor footprint for DIN-rail mounting."},{"question":"What wire sizes does the 3RT2027-1AB04 accept?","answer":"The power terminals accept 1 to 10 mm² solid or stranded wire. The coil terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded. All connections are screw-type."},{"question":"Will the 3RT2027-1AB04 drop into a panel designed for the 3RT2027-1AK64-3MA0?","answer":"Yes, both are S0 frame size with the same 45 x 85 x 141 mm dimensions and 35 mm DIN-rail mounting. The power circuit ratings are identical. The only difference is the coil voltage — verify that the 3RT2027-1AB04's coil matches your control voltage before installing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2027-1AB04","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/3RT2027-1AB04 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}