{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-1CP04-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-1CP04-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-1CP04-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1CP04-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT2018-1CP04-3MA0, Size S00, 45 mm width, 117 mm depth, screw and snap-on DIN rail mounting.","salesMarkdown":"The Siemens SIRIUS 3RT2018-1CP04-3MA0 is a Size S00 power contactor — the smallest frame in the SIRIUS contactor family, built for switching motor loads and resistive loads in control panels up to about 5.5 kW at 400 V. The Size S00 footprint (45 mm wide, 58 mm tall, 117 mm deep) is the one you reach for when panel space is tight and the load is a small pump, fan, or conveyor drive. The AC-3 switching frequency of 750 operations per hour tells you this contactor is rated for the start-stop duty cycle of a typical induction motor; the AC-4 rating of 250 operations per hour covers plugging and inching, which is harder on the contacts. The 24 V coil draws 0.25 A at 50 or 60 Hz, and the coil terminals are screw-type — no push-in or cage-clamp here, so factor in the screwdriver time if you're used to spring terminals on the auxiliary side. That means you can orient it to fit cable entries or gland plates without worrying about the contactor's internal mechanics — the arc chamber and magnet are designed for that range. That side clearance is tighter than the front-to-back gap — if you're packing multiple contactors side-by-side, the 6 mm is the binding constraint for heat dissipation and arc flash separation. ## Wiring and conductor range For multiple conductors, the terminal can take 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm². That covers common control wiring (1.5 mm² for coil and auxiliary circuits) and power wiring up to 4 mm² for the main poles — adequate for the rated currents this contactor handles. That is the normal state for a SIRIUS Size S00 contactor; the series is a workhorse in European panel designs and is not near end-of-life. ## Temperature and mechanical endurance Storage range is -55 °C to +80 °C, which is the handling and shipping limit, not the running limit. Mechanical life is 10,000,000 cycles typical, so the contactor itself will outlast the panel's service life in most duty cycles; the electrical life depends on the load category and switching frequency, but the mechanical figure gives you confidence in the actuator and spring set.","metaTitle":"Siemens SIRIUS 3RT2018-1CP04-3MA0 Power Contactor, Size S00,","metaDescription":"Siemens SIRIUS 3RT2018-1CP04-3MA0 power contactor, Size S00, 45 mm width, 117 mm depth. AC-3 rated 750 1/h. Screw & snap-on 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":"117 mm","Solid":"0.5 ... 4 mm²","Width":"45 mm","at AC":"7 ... 13 ms","Height":"58 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"0.5 ... 4 mm²","at 50 Hz":"0.25","at 60 Hz":"0.25","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","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 standard mounting rail according to DIN EN 60715","at AC-3e maximum":"750 1/h","For Main Contacts":"20 ... 12","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":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 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":"2 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.2 A","at 480 V rated value":"14 A","at 50 Hz rated value":"230 V","at 500 V rated value":"2 A","at 60 Hz rated value":"230 V","at 600 V rated value":"11 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 12","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 hp","at 575/600 V rated value":"10 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":"6.6 W","at AC-2 at 400 V rated value":"7.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"11.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"19.4 A","at AC-5b up to 400 V rated value":"13.2 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)","Without Load Current Share Typical":"5.7 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 50A (690V,100kA), aM: 25A (690V,100kA), BS88: 50A (415V,80kA)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 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","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":"300 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"169 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"128 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"92 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"74 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":"4 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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=408919&mlfb=3RT2018-1CP04-3MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1CP04-3MA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"Size S00, 45 mm wide, 117 mm deep. AC-3 switching frequency 750 operations per hour, AC-4 at 250 operations per hour. Coil draws 0.25 A at 24 V 50/60 Hz. Rated for 6 A at 24 V and 3 A at 400 V. Accepts solid/stranded wire 0.5 to 4 mm²."},{"question":"Does this contactor include an auxiliary switch?","answer":"No. The -3MA0 variant has no auxiliary switch. You will need to add a separate auxiliary contact block if you require a feedback signal."},{"question":"What clearance is needed around the contactor in the panel?","answer":"10 mm upwards, downwards, and forwards; 6 mm at the sides. The side clearance is the tightest constraint for multi-contactor layouts."},{"question":"What is the difference between the 3RT2018-1CP04-3MA0 and the 3RT2017-1AB01-ZX95?","answer":"Both are Size S00 SIRIUS contactors. The 3RT2017-1AB01-ZX95 is a smaller-rated variant (lower AC-3 current) and includes a different coil voltage or auxiliary configuration. The 3RT2018-1CP04-3MA0 has a 24 V 50/60 Hz coil and no auxiliary switch. They share the same mounting footprint and terminal ranges, so a panel designed for the 3RT2017 can accept the 3RT2018 without rewiring, provided the load current and coil voltage match the new part."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-1CP04-3MA0","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/3RT2018-1CP04-3MA0 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}}