{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RF2420-1AC45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RF2420-1AC45","canonicalUrl":"https://aoctrl.com/siemens/3RF2420-1AC45","factsUrl":"https://aoctrl.com/api/mcp/products/3RF2420-1AC45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RF2420-1AC45 three-phase solid-state contactor, 22 A AC-51, 48-600 V AC, zero-point switching, screw terminals, 74.5 x 100 x 119.5 mm.","salesMarkdown":"The Siemens SIRIUS 3RF2420-1AC45 is a three-phase solid-state contactor with zero-point switching, rated 22 A in AC-51 duty (resistive load) and 15 A per UL 508. It switches loads between 48 and 600 V AC at 50/60 Hz, with a minimum operational current of 500 mA — so it handles everything from small resistive heaters up to a 22 A resistive three-phase bank. Zero-point switching means the thyristors turn on only when the AC waveform crosses zero, which minimizes inrush and electrical noise — a clean start for resistive loads like ovens or infrared heaters. The ON-delay is 1 ms plus at most one half-wave, so response is near-instantaneous for the control loop. Dimensions are 74.5 mm wide, 100 mm tall, 119.5 mm deep, fitting a standard enclosure footprint. Main and control circuit connections are screw-type terminals, accepting 1x (0.5 to 2.5 mm²) solid or stranded, or 2x (0.5 to 1.0 mm²) — typical for panel wiring up to 14 AWG. The control circuit draws 22 mA at DC rated value (30 V) and 30 mA control current at DC rated value, so it's compatible with standard 24 VDC PLC outputs. ## Thermal and electrical limits The I²t value is 1800 A²s, which governs fuse coordination: the recommended upstream fuse is a 3NA3805 (rated below the semiconductor relay's current) for short-circuit protection up to 460 V. RoHS compliance date is July 1, 2006, covering the EU RoHS scope. No other compliance flags are noted in the listing; the UL 508 rating (15 A) confirms acceptance for North American panel builds.","metaTitle":"Siemens SIRIUS 3RF2420-1AC45 Solid-State Contactor, 22 A AC-","metaDescription":"Siemens SIRIUS 3RF2420-1AC45 three-phase solid-state contactor, 22 A AC-51 rated, 48-600 V AC, zero-point switching, screw terminals, current lifecycle stage, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Solid State Relays"],"specifications":{"Depth":"119.5 mm","Solid":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.0 mm²)","Width":"74.5 mm","at DC":"22 mA","title":"3RF2420-1AC45","Height":"100 mm","at 50 Hz":"40 ... 660 V","at 60 Hz":"40 ... 660 V","description":"Solid-state contactor 3-phase 3RF2 AC 51 / 20 A / 40 °C 48-600 V / 4-30 V DC 3-phase controlled screw terminal Blocking voltage 1200 V","up to 460 V":"3NA3805 ; These fuses have a smaller rated current than the semiconductor relays","ON-delay time":"1 ms; additionally max. one half-wave","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw fixing and snap-on mounting on standard mounting rail 35 mm according to IEC 60715","Product Function":"zero-point switching","For Main Contacts":"7 mm","I2t value maximum":"1 800 A²·s","Solid Or Stranded":"0.5 ... 2.5 mm²","at DC rated value":"30 V","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"solid-state contactor","Derating Temperature":"40 °C","at 50 Hz rated value":"48 ... 600 V","at 60 Hz rated value":"48 ... 600 V","at AC-51 rated value":"22 A","Design Of The Product":"three-phase controlled","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Operational Current Minimum":"500 mA","at AC in hot operating state":"66 W","Substance Prohibitance (Date)":"07/01/2006","Insulation Voltage Rated Value":"600 V","Operating Frequency Rated Value":"50 ... 60 Hz","according to UL 508 rated value":"15 A","at AWG cables for main contacts":"2x (14 ... 10)","Reverse Current Of The Thyristor":"10 mA","For Auxiliary And Control Circuit":"screw-type terminals","control current at DC rated value":"30 mA","For Auxiliary And Control Contacts":"7 mm","Without Load Current Share Typical":"0.9 W","at AC-51 according to IEC 60947-4-3":"15 A","Surge Current Resistance Rated Value":"600 A","Symmetrical Line Frequency Tolerance":"5 Hz","Of The Auxiliary And Control Contacts":"M3","at AC in hot operating state per pole":"22 W","due to burst according to IEC 61000-4-4":"2 kV / 5 kHz behavior criterion 2","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","2 Of The Accessories That Can Be Ordered":"converter","Finely Stranded With Core End Processing":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.0 mm²)","Number Of Poles For Main Current Circuit":"3","Finely Stranded Without Core End Processing":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.0 mm²)","For Main Contacts With Screw-Type Terminals":"18 ... 22 lbf·in","at DC initial value for signal <1> detection":"4 V","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"15g / 11 ms","Type Of Voltage Of The Control Supply Voltage":"DC","vibration resistance according to IEC 60068-2-6":"2g","at AWG cables for auxiliary and control contacts":"1x (AWG 20 ... 12)","at DC full-scale value for signal<0> recognition":"1 V","electrostatic discharge according to IEC 61000-4-2":"4 kV contact discharging / 8 kV air discharging, behavior criterion 2","Surge Voltage Resistance Of Main Circuit Rated Value":"6 kV","Installation Altitude At Height Above Sea Level Maximum":"1 000 m","conducted HF interference emissions according to CISPR11":"Class A for industrial environment","Relative Symmetrical Tolerance Of The Operating Frequency":"10 %","field-bound HF interference emission according to CISPR11":"Class A for industrial environment","Design Of The Thread Of The Screw For Securing The Equipment":"M4","For Auxiliary And Control Contacts With Screw-Type Terminals":"7.5 ... 5.3 lbf·in","Blocking Voltage At The Thyristor For Main Contacts Maximum Permissible":"1 200 V","of back-up R fuse link for semiconductor protection at NH design usable":"3NE8015-1","AWG number as coded connectable conductor cross section for main contacts":"14 ... 10","of full range R fuse link for semiconductor protection at NH design usable":"3NE1814-0","Rate Of Voltage Rise At The Thyristor For Main Contacts Maximum Permissible":"1 000 V/µs","of full range R fuse link for semiconductor protection at cylindrical design usable":"5SE1320 ; Maximum operating voltage 400 V!","of back-up R fuse link for semiconductor protection at cylindrical design 10 x 38 mm usable":"3NC1032","of back-up R fuse link for semiconductor protection at cylindrical design 14 x 51 mm usable":"3NC1450","of back-up R fuse link for semiconductor protection at cylindrical design 22 x 58 mm usable":"3NC2250"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$110.49","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/67f11a9d4267918df4919740931474f4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=51790&mlfb=3RF2420-1AC45"},"ai":{"faq":[{"question":"What are the key ratings for the 3RF2420-1AC45?","answer":"AC-51 rated current is 22 A; UL 508 rated current is 15 A. Operating voltage is 48 to 600 V AC at 50/60 Hz. Minimum operational current is 500 mA. Power dissipation at rated load is 66 W."},{"question":"What compliance documentation does this part carry?","answer":"RoHS compliance is dated July 1, 2006. UL 508 rating (15 A) is listed. No other certifications are explicitly stated in the record."},{"question":"What wire sizes does the 3RF2420-1AC45 accept?","answer":"Screw terminals accept 1x (0.5 to 2.5 mm²) or 2x (0.5 to 1.0 mm²) solid or stranded wire, and 2x (14 to 10) AWG for main contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RF2420-1AC45","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/3RF2420-1AC45 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}}