{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-4BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-4BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-4BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-4BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-4BG40 auxiliary contactor, size S00, 2 instantaneous contacts, 45 mm width, screw and snap-on 35 mm DIN rail mounting, 10 A at 24 V DC rated value.","salesMarkdown":"## Panel fit and switching capacity The 3RH2122-4BG40: Mechanical endurance is 30,000,000 cycles typical, which suits high-cycle applications like conveyor interlocks or valve position feedback where the contactor outlasts the machine service interval. ## Coil and switching characteristics The DC magnet coil draws 4 W both closing and holding — no inrush spike, so the PLC output or relay driving it sees a steady load, and the 6 kV rated surge voltage resistance means it handles transient spikes from inductive loads without external suppression in most cases. Rated control supply voltage is 125 V with an initial value factor of 0.8 and full-scale factor of 1.1 — the coil will pick up at 100 V and hold at 137.5 V, so a sagging 120 V control bus still keeps it engaged. It supports auxiliary switch extension, meaning you can add front-mounted switch blocks without changing the base contactor — useful if the control scheme evolves after the panel is built. RoHS compliance is dated 10/01/2009, so it meets the EU substance restrictions that apply to most industrial equipment shipped into Europe or following IEC standards.","metaTitle":"Siemens 3RH2122-4BG40 SIRIUS Auxiliary Contactor, 45 mm","metaDescription":"Siemens 3RH2122-4BG40 SIRIUS auxiliary contactor, size S00, 2 instantaneous contacts, 10 A at 24 V DC. Screw and snap-on 35 mm DIN rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","title":"3RH2122-4BG40","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":"125 V","description":"Contactor relay, 2 NO + 2 NC, 125 V DC, Size S00, ring cable lug connection","Initial Value":"0.8","During Storage":"-55 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.1","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","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","Product Extension Auxiliary Switch":"Yes","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"4 W","Surge Voltage Resistance Rated Value":"6 kV","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","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":"2","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":"ring terminal lug connection","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1af34f5409f97ebf874ff4da2c40c7a2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=504138&mlfb=3RH2122-4BG40"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-4BG40","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/3RH2122-4BG40 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}}