{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2122-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2122-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2122-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2122-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2122-1BB40 auxiliary contactor, size S00, 2 NO instantaneous contacts, 24 V DC coil, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"## SIRIUS S00 auxiliary contactor — 2 NO, 24 V DC coil The 3RH2122-1BB40 is a SIRIUS auxiliary contactor in frame size S00, carrying two normally-open instantaneous contacts and a 24 V DC magnet coil that draws 4 W closing and 4 W holding power. It screws or snaps onto a 35 mm DIN rail — the S00 footprint (45 mm wide, 57.5 mm tall, 73 mm deep) fits standard panel layouts and leaves clearance for side-by-side ganging: 6 mm to the side, 10 mm forward and upward. ## Contact ratings and switching capability The NO contacts are rated 10 A at 24 V DC and 10 A at 230 V AC, with a mechanical life of 30 million operations typical — the electrical endurance depends on the switched load, not the contact itself. At higher DC voltages the current rating drops: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.26 A at 600 V — the arcing time of 10–15 ms sets the DC switching limit, so confirm the load's inductive time constant against the contact's DC-13 capability. AC switching covers the full line range: 10 A at 230 V, 3 A at 400 V, 2 A at 500 V, 1 A at 690 V — the contactor handles up to 10,000 switching cycles per hour at rated load. ## Mounting and environmental fit Mounting position is flexible — the contactor can be rotated ±180° on a vertical surface and tilted forward or backward ±22.5°, which helps when fitting into tight panel sections or angled sub-panels. Operating temperature spans -25 to +60 °C with storage from -55 to +80 °C, and it's rated for pollution degree 3 — suitable for industrial control cabinets where conductive dust or condensation is present. The screw terminals accept 2× 0.5–1.5 mm² solid or stranded, 2× 0.75–2.5 mm², or a single 4 mm² conductor — covers most control wiring gauges found in MRO spares bins. ## Sourcing and lifecycle The 3RH2122-1BB40 carries the SIRIUS brand and is part of Siemens' standard auxiliary contactor range — a widely stocked SKU that consolidates well with other S00-frame contactors and overload relays in the same panel.","metaTitle":"Siemens 3RH2122-1BB40 SIRIUS Auxiliary Contactor, 2 NO, S00","metaDescription":"Siemens 3RH2122-1BB40 SIRIUS auxiliary contactor, size S00, 2 NO contacts, 24 V DC coil, screw and snap-on DIN rail mount. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","title":"3RH2122-1BB40","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":"24 V","description":"Contactor relay, 2 NO + 2 NC, 24 V DC, Size S00, screw terminal","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","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","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","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":"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":"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":"$21.59","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2eb62ce1641a6cc0af0d6ccddc7644c7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=394088&mlfb=3RH2122-1BB40"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2122-1BB40","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/3RH2122-1BB40 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}}