{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1055-6LA06","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1055-6LA06","canonicalUrl":"https://aoctrl.com/siemens/3RT1055-6LA06","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1055-6LA06","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1055-6LA06 power contactor, size S6, screw fixing, 172 x 120 x 170 mm, 25-120 mm² stranded main circuit.","salesMarkdown":"The main circuit accepts stranded conductors from 25 to 120 mm², which covers motor feeds up to roughly 200 A depending on duty — the 230 V motor rating is 30 hp, a solid benchmark for a 30–40 kW motor at 400 V three-phase. The auxiliary contact block is rated at 10 A at 24 V and derates to 0.3 A at 230 V, so it can drive PLC inputs or small relays at control voltage but needs checking if you're switching a 230 V pilot light at the full 10 A — it won't. Switching frequency varies by duty class: AC-1 (resistive) allows 800 operations per hour, AC-3 (squirrel-cage motor start/run) allows 750, and AC-4 (plugging/inching) drops to 130. That AC-3 figure is the one most buyers care about — 750 ops/h is enough for a fast cycling line but not for a servo-style reversing application. The 60 °C ceiling is fine for most indoor panels but marginal for a sun-baked enclosure in a Middle East plant — if ambient inside the panel hits 55 °C, you're still within spec but should derate the current per the manufacturer's curve (not included here). The contactor measures 172 mm high by 120 mm wide by 170 mm deep — that's a substantial footprint, so check your DIN-rail or backplate real estate before committing. The coil terminals are screw-type, and the auxiliary wiring accepts solid or stranded conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or max 2x 0.75–4 mm². That covers standard control wiring but won't accept a single 6 mm² — plan your terminal blocks accordingly.","metaTitle":"Siemens 3RT1055-6LA06 SIRIUS Power Contactor, Size S6, 120 m","metaDescription":"Siemens 3RT1055-6LA06 SIRIUS power contactor, size S6, 172 x 120 x 170 mm. Screw fixing, 25-120 mm² stranded main circuit. Active production, sourced to order.","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":"3RT1055-6LA06","Height":"172 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"25 ... 120 mm²","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","description":"power contactor, AC-3e/AC-3 150 A, 75 kW / 400 V without operating mechanism 3-pole, auxiliary contacts 2 NO + 2 NC without operating mechanism main circuit: busbar control and auxiliary circuit: screw terminal","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","Number Of Holes":"1","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","at AC-3e maximum":"750 1/h","Diameter Of Holes":"9 mm","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 500 V rated value":"2 A","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","Width Of Connection Bar":"17 mm","For Main Current Circuit":"Connection bar","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","Thickness Of Connection Bar":"3 mm","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":"No","Substance Prohibitance (Date)":"05/01/2012","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)","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 355 A (690 V, 100 kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"9 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","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","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":null,"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=63248&mlfb=3RT1055-6LA06"},"ai":{"faq":[{"question":"What are the main dimensions of the 3RT1055-6LA06?","answer":"Height 172 mm, width 120 mm, depth 170 mm. Clearance: 10 mm up/down, 20 mm forward, 10 mm sides."},{"question":"What wire sizes does the main circuit accept?","answer":"Stranded conductors from 25 to 120 mm². Auxiliary terminals accept 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or max 2x 0.75–4 mm² solid or stranded."},{"question":"What is the motor horsepower rating at 230 V?","answer":"30 hp at 230 V, which corresponds to roughly a 30–40 kW motor at 400 V three-phase under AC-3 duty."},{"question":"How does the 3RT1055-6LA06 compare to the 3RT2028-1AU00?","answer":"The 3RT2028-1AU00 is a smaller SIRIUS contactor (size S0 or S2) with a lower current rating and different mounting footprint. The 3RT1055-6LA06 is size S6, so it will not drop into a panel wired for the 3RT2028 without rewiring the main power lugs and checking enclosure space."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1055-6LA06","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/3RT1055-6LA06 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}}