{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1066-2NB36","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1066-2NB36","canonicalUrl":"https://aoctrl.com/siemens/3RT1066-2NB36","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1066-2NB36","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1066-2NB36 power contactor, size S10, spring-type coil terminals, screw fixing, 210 x 202 x 145 mm.","salesMarkdown":"## S10 frame, spring coil terminations The 3RT1066-2NB36: This is a SIRIUS S10-frame power contactor, the largest standard frame in the SIRIUS contactor family before you step to the 3RT107 or vacuum types. The 210 mm height, 202 mm depth, and 145 mm width mean it needs a full 3.05 dm³ of enclosure volume — plan the backpanel layout with that footprint, not just the DIN-rail clip zone. The magnet coil connects via spring-type terminals, not screw clamps — so the control wiring is a push-in job for solid or ferruled stranded conductors up to 2x 2.5 mm². The power circuit, by contrast, takes stranded cable from 70 to 240 mm², which is a lug-and-bolt connection through a single 11 mm hole. That split — spring on the coil, bolted on the power — is typical for this frame size and avoids the nuisance of loose power terminations under thermal cycling. ## Coil voltage and auxiliary contact capacity Rated control supply voltage is 21 to 27.3 V, which covers nominal 24 VDC systems with margin for brownout. If you're switching a PLC input or a small relay off this contactor's aux, stay within those limits at the applied voltage. Mechanical endurance is 10 million operations typical — that's the life of the mechanism before wear, not the electrical life under load. Electrical life depends on the duty class and switching frequency: at AC-3 (motor switching) the maximum rate is 500 operations per hour, while AC-4 (inching/plugging) drops to 130 per hour. ## Mounting, clearances, and environment Fastening is by screw fixing — four M6 or M8 bolts through the 11 mm mounting holes. Minimum clearances to adjacent metalwork: 10 mm upwards, downwards, and sideways, and 20 mm forwards. Those are the free-air spacing for arc extinction — don't crowd the contactor against the enclosure wall or another device. The 0.8 initial value and 1.1 full-scale value likely refer to the coil operating range at the voltage limits — the contactor picks at 0.8× rated voltage and drops out at 1.1×. That's standard for DC-operated contactors and means the coil won't drop out on a moderate voltage sag.","metaTitle":"Siemens 3RT1066-2NB36 SIRIUS S10 Power Contactor","metaDescription":"Siemens SIRIUS 3RT1066-2NB36 power contactor, size S10, spring-type coil terminals, screw fixing. Current production. Quoted to order. 210x202x145 mm.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"202 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"145 mm","at AC":"80 ... 100 ms","at DC":"80 ... 100 ms","title":"3RT1066-2NB36","Height":"210 mm","Upwards":"10 mm","Forwards":"20 mm","Stranded":"70 ... 240 mm²","at 50 Hz":"0.4","at 60 Hz":"0.4","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"21 ... 27.3 V","description":"power contactor, AC-3e/AC-3 300 A, 160 kW / 400 V, AC (50-60 Hz) / DC Uc: 21-27, 3 V PLC input 24 V DC 3-pole, auxiliary contacts 2 NO + 2 NC drive: electronic main circuit: busbar control and auxiliary circuit: spring-loaded terminal","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","Number Of Holes":"1","at AC-1 maximum":"750 1/h","at AC-2 maximum":"250 1/h","at AC-3 maximum":"500 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":"500 1/h","Diameter Of Holes":"11 mm","Mounting Position":"with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back","Size Of Contactor":"S10","Solid Or Stranded":"2x (0,25 ... 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":"6 A","at 400 V rated value":"3 A","at 440 V rated value":"1.4 A","at 480 V rated value":"302 A","at 50 Hz rated value":"21 ... 27.3 V","at 500 V rated value":"2 A","at 60 Hz rated value":"21 ... 27.3 V","at 600 V rated value":"289 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","at 1000 V rated value":"132 kW","For Auxiliary Contacts":"24 ... 14","Width Of Connection Bar":"25 mm","For Main Current Circuit":"Connection bar","at 200/208 V rated value":"100 hp","at 220/230 V rated value":"125 hp","at 460/480 V rated value":"250 hp","at 575/600 V rated value":"300 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","Thickness Of Connection Bar":"6 mm","at AC-3 rated value maximum":"1 000 V","at AC in hot operating state":"66 W","at AC-3e rated value maximum":"1 000 V","at AC-4 at 400 V rated value":"280 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":"290 A","at AC-5b up to 400 V rated value":"249 A","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 400 A (690 V, 100 kA), aM: 315 A (690 V, 50 kA), BS88: 400 A (415 V, 50 kA)","Without Load Current Share Typical":"3.4 W","closing power of magnet coil at DC":"580 W","holding power of magnet coil at DC":"3.4 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 500 A (690 V, 100 kA)","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"22 W","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","voltage at PLC-control input rated value":"24 V","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":"2x (0.25 ... 2.5 mm²)","Type Of Voltage Of The Control Supply Voltage":"AC/DC","Limited To 1 S Switching At Zero Current Maximum":"5 524 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"4 579 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"3 153 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"1 883 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"1 445 A; Use minimum cross-section acc. to AC-1 rated value","type of PLC-control input according to IEC 60947-1":"Type 2","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","operating range factor of the voltage at PLC-control input":"0.8 ... 1.1","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":"185 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/0db2e415209d5c91bc78a32c8abba8f8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=412734&mlfb=3RT1066-2NB36"},"ai":{"faq":[{"question":"What is the 3RT1066-2NB36's depth?","answer":"The depth is 202 mm, with a height of 210 mm and width of 145 mm."},{"question":"What wire sizes does the 3RT1066-2NB36 accept on the power and coil terminals?","answer":"The power circuit accepts stranded cable from 70 to 240 mm² through a single 11 mm hole. The coil terminals are spring-type and accept solid or stranded conductors up to 2x 2.5 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1066-2NB36","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/3RT1066-2NB36 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}}