{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1055-1AB36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1055-1AB36","canonicalUrl":"https://aoctrl.com/siemens/3RT1055-1AB36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1055-1AB36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1055-1AB36, S6-size power contactor, screw-type coil terminals, 23-26 VDC coil, 172 x 120 x 170 mm.","salesMarkdown":"Its coil is rated for 23 to 26 VDC, so a nominal 24 VDC control supply is the target; the pickup and dropout timing sits between 40 and 60 ms for both AC and DC energisation, and the arcing time spans 10 to 15 ms — numbers that matter when sequencing contactors in a motor starter or reversing circuit. The main power circuit accepts stranded conductors from 16 to 70 mm², which is typical for the S6 frame size and the motor currents this contactor handles. ## Switching frequency and duty capability Maximum switching rates are given per utilisation category: 800 cycles per hour at AC-1 (resistive), 750 at AC-3 and AC-3e (standard squirrel-cage motors), 300 at AC-2 (slip-ring motors), and 130 at AC-4 (plugging / inching). For a motor-starting application under AC-3 duty, the 750 cycles/hour ceiling means the contactor can handle frequent starts — a conveyor or pump cycling every 4.8 seconds — provided the thermal load stays within the contactor's design limits. The AC-4 rate of 130 cycles/hour is the limiting case for reversing or jogging duty; exceeding that will overheat the arc chutes and reduce contact life. The built-in auxiliary switch is rated for 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, and 0.3 A at 220 V — all at the rated voltage of the respective DC control circuits. These ratings are for the DC-13 load category (solenoid valves, contactor coils, relays) and define the maximum current the auxiliary contacts can break inductively at each voltage level. ## Mechanical endurance and environmental limits Mechanical endurance is quoted at 10 million operating cycles, which is the typical figure for a contactor of this frame size and build quality — it reflects the life of the mechanism before any electrical wear is considered. Operating temperature range is -25 to +60 °C, with storage from -55 to +80 °C; the mounting position allows vertical surface mounting with +/-90° rotation and +/-22.5° tilt forward and back, so it fits in most standard panel layouts. ## Wiring and connection details The main power circuit uses screw-type terminals accepting 16 to 70 mm² stranded conductors; the auxiliary circuit terminals accept solid or stranded conductors in two sizes per clamp: 2x 0.5 to 1.5 mm² or 2x 0.75 to 2.5 mm², with a maximum of 2x 0.75 to 4 mm². The coil terminals are also screw-type, so the entire contactor can be wired with a single screwdriver type — no mixed tooling needed on the panel assembly line. Fastening is by screw fixing, not snap-on DIN rail; the S6 frame is bolted directly to the mounting plate, which is standard for larger contactors where vibration resistance matters more than quick removal. There is no official successor or replacement part listed — the 3RT1055-1AB36 is the current build state for this S6 contactor variant.","metaTitle":"Siemens SIRIUS 3RT1055-1AB36 Power Contactor, S6, 170mm dept","metaDescription":"Siemens SIRIUS 3RT1055-1AB36 power contactor, S6 size, 172x120x170mm, screw-type coil terminals, 23-26 VDC coil, 10A aux at 24V. Active production. RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"170 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"120 mm","at AC":"40 ... 60 ms","at DC":"40 ... 60 ms","title":"3RT1055-1AB36","Height":"172 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"16 ... 70 mm²","at 50 Hz":"0.8","at 60 Hz":"0.8","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"23 ... 26 V","description":"power contactor, AC-3e/AC-3 150 A, 75 kW / 400 V AC (50-60 Hz) / DC Uc: 23-26 V 3-pole, auxiliary contacts 2 NO + 2 NC drive: conventional main circuit: box terminal control and auxiliary circuit: screw terminal","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"800 1/h","at AC-2 maximum":"300 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"130 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw fixing","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Size Of Contactor":"S6","Solid Or Stranded":"2x (0,5 ... 1,5 mm²), 2x (0,75 ... 2,5 mm²), max. 2x (0,75 ... 4 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":"30 hp","at 400 V rated value":"3 A","at 440 V rated value":"1.4 A","at 480 V rated value":"156 A","at 50 Hz rated value":"23 ... 26 V","at 500 V rated value":"2 A","at 60 Hz rated value":"23 ... 26 V","at 600 V rated value":"144 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"90 kW","For Auxiliary Contacts":"18 ... 14","For Main Current Circuit":"box terminal","at 200/208 V rated value":"50 hp","at 220/230 V rated value":"60 hp","at 460/480 V rated value":"125 hp","at 575/600 V rated value":"150 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","at AC-3 rated value maximum":"1 000 V","at AC in hot operating state":"27 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"132 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"162 A","at AC-5b up to 400 V rated value":"124 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 315 A (690 V, 100 kA), aM: 200 A (690 V, 50 kA), BS88: 315 A (415 V, 50 kA)","Without Load Current Share Typical":"5.2 W","closing power of magnet coil at DC":"360 W","holding power of magnet coil at DC":"5.2 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 355 A (690 V, 100 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"9 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), 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","Finely Stranded Without Core End Processing":"16 ... 70 mm²","Type Of Voltage Of The Control Supply Voltage":"AC/DC","Limited To 1 S Switching At Zero Current Maximum":"2 727 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"1 831 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"1 300 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"850 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"703 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":"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":"500 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":"95 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":"$278.13","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/48191814343ef1de12d436857500061f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=214116&mlfb=3RT1055-1AB36"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RT1055-1AB36?","answer":"The evidence lists 3RT2028-1BB40, 3RT2028-1BB44-3MA0, and 3RT2026-1FB44-3MA0 as peer MPNs, but without a direct cross-reference statement or an official successor relationship. A panel originally specified around the 3RT2028-1BB40 would require a full dimensional and electrical comparison before assuming a drop-in fit — the S6 frame size and screw-fixing method are shared, but terminal layout and auxiliary contact configuration may differ."},{"question":"What is the depth of the 3RT1055-1AB36?","answer":"The depth is 170 mm, with a height of 172 mm and a width of 120 mm."},{"question":"What conductor sizes does the 3RT1055-1AB36 accept?","answer":"The main power circuit accepts stranded conductors from 16 to 70 mm². The auxiliary circuit accepts solid or stranded conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², with a maximum of 2x 0.75 to 4 mm² per clamp."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1055-1AB36","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/3RT1055-1AB36 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}}