{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1KF40-0LA4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1KF40-0LA4","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1KF40-0LA4","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1KF40-0LA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-1KF40-0LA4, size S00 auxiliary contactor, 45 mm width, 117 mm depth, 110 V DC coil with integrated suppressor diode, screw and snap-on 35 mm DIN rail mounting, 2 instantaneous contacts.","salesMarkdown":"Rated for 110 V DC coil operation with an integrated suppressor diode, this variant handles the DC control voltages common in PLC-driven panels and battery-backed safety circuits. The diode suppresses the inductive kick when the coil de-energizes — no external snubber needed on the van. ## Switching ratings — what they mean on the line The contact ratings are given per voltage, not as a single blanket current. At 24 V DC it switches 10 A; at 60 V DC it drops to 4.7 A; at 110 V DC it's 3 A; at 220 V DC it's 1.2 A. This voltage-dependent derating is typical for DC switching — arc extinction is harder at higher voltage, so the contactor's capability shrinks. On the AC side at 230 V it handles 10 A, at 400 V it's 3 A, and at 690 V it's 1 A. The 10 000 switching cycles per hour at AC and the 7–20 ms arcing time at DC give a realistic duty-cycle picture for conveyor or pump control. Two instantaneous contacts (NO/NC configurable via the auxiliary switch block) handle the signal-level interlocking. The design accepts an auxiliary switch extension, so you can add more contacts without replacing the whole unit — useful when a line-down fix needs extra feedback to the PLC. RoHS compliance is documented with a substance prohibition date of 10/01/2009, covering the EU RoHS directive. ## Mounting and clearances — panel integration notes That 6 mm side gap is the one that catches people — if you're packing contactors side-by-side, leave at least that much breathing room for heat dissipation and wiring access. Terminal capacity accepts 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid or stranded. That covers most control-circuit wiring gauges on the van; no need for special ferrules unless the panel spec demands them.","metaTitle":"Siemens 3RH2122-1KF40-0LA4 SIRIUS Auxiliary Contactor, 45 mm","metaDescription":"Siemens SIRIUS 3RH2122-1KF40-0LA4 auxiliary contactor, size S00, 45 mm width, 117 mm depth, screw/snap-on DIN rail, 110 V coil with suppressor diode, current production, available","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"117 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 20 ms","Height":"57.5 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"110 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.25","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","Degree Of Pollution":"3","Product Designation":"Auxiliary contactor","at 24 V rated value":"10 A","at 60 V rated value":"4.7 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 440 V rated value":"0.5 A","at 500 V rated value":"2 A","at 600 V rated value":"0.26 A","at 690 V rated value":"1 A","Instantaneous Contact":"2","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"suppressor diode","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"13 W","holding power of magnet coil at DC":"4 W","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","operating frequency at DC-12 maximum":"1 000 1/h","operating frequency at DC-13 maximum":"1 000 1/h","operational current at AC-12 maximum":"10 A","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"2","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Identification Number And Letter For Switching Elements":"22 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","design of the miniature circuit breaker for short-circuit protection of the auxiliary circuit up to 230 V":"C characteristic: 6 A; 0.4 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/adaafea01ac753bac9fb546c9442bd98.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=97402&mlfb=3RH2122-1KF40-0LA4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1KF40-0LA4/alternatives.json"},"ai":{"faq":[{"question":"What is 3RH2122-1KF40-0LA4's listed depth (117 mm) on this component line?","answer":"The depth is 117 mm, measured from the DIN rail mounting surface to the furthest point of the contactor body. Width is 45 mm, height is 57.5 mm."},{"question":"Will 3RH2122-1KF40-0LA4 drop into a panel that was specified around 3RH2122-1BW40 without rewiring?","answer":"Both are SIRIUS S00 auxiliary contactors with the same footprint (45 mm wide, 117 mm deep, snap-on DIN rail), so mechanical fit is identical. However, the coil voltage and suppressor differ — 3RH2122-1KF40-0LA4 has a 110 V DC coil with a built-in suppressor diode, while the 1BW40 variant uses a different coil voltage. Check the coil rating matches your control circuit before swapping; the terminals and wiring slot are the same."},{"question":"Where can I buy 3RH2122-1KF40-0LA4 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time figure is published here because the channel picture changes daily. Submit an RFQ for a real-time commitment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1KF40-0LA4","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/3RH2122-1KF40-0LA4 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}}