{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2244-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2244-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2244-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2244-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, auxiliary contactor, 3RH2244-1BB40, 4 NO contacts, 24 VDC coil, 45 mm width, S00 size, screw and snap-on mounting.","salesMarkdown":"The Siemens SIRIUS 3RH2244-1BB40 is a 4-pole auxiliary contactor, size S00, with 4 normally open (NO) instantaneous contacts and a 24 VDC coil. Coil pickup and holding are both rated at 4 W DC, so the control transformer sizing is straightforward — no inrush spike to budget for. The coil holds at 24 V nominal; the 0.8 initial-to-full-scale ratio means it pulls in reliably even if the DC supply sags a bit. ## What the contact ratings mean for your load Each NO contact is rated for specific voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. These are the thermal / utilization category ratings — use them as the hard ceiling for switching resistive or lightly inductive control loads. For DC switching, the arcing time runs 10–15 ms, so inductive DC loads need proper flyback suppression to avoid contact welding. The 4 NO contacts are all the same rating, so you can parallel them for higher current on a single signal (up to 40 A total at 24 V, but watch the terminal capacity — 2x 2.5 mm² per terminal is the practical limit). Width is 45 mm, depth 117 mm, height 57.5 mm — it's a standard S00 footprint that snaps onto 35 mm DIN rail or screws directly to a backplate. That means you can orient it to fit tight enclosures without derating. That's less than many contactors — useful when packing auxiliaries next to the main contactor in a crowded panel. The SIRIUS family is broad, and the 3RH2 series covers auxiliary contactors with various contact configurations and coil voltages. The 3RH2244-1BB40 is the 4 NO, 24 VDC variant. If your panel was spec'd around a 3RT2028-1BB40 power contactor, this auxiliary sits alongside it on the same DIN rail, same S00 footprint — no rewiring needed for the mounting. Relative humidity minimum is 10 %, so it handles dry climates without issue. RoHS compliance date is October 1, 2009 — it's been RoHS-compliant for over a decade. No substance prohibitance issues for current builds.","metaTitle":"Siemens SIRIUS 3RH2244-1BB40 Auxiliary Contactor, 4 NO, 24 V","metaDescription":"Siemens SIRIUS 3RH2244-1BB40 auxiliary contactor, 4 NO contacts, 24 VDC coil, 45 mm wide, S00 size. Active production. Sourced to order. Contact ratings up to 10 A at 24 V.","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 ... 13 ms","title":"3RH2244-1BB40","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, 4 NO + 4 NC, 24 V DC, size S00, screw terminal, captive auxiliary switch","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":"10 000 000","at 110 V rated value":"3 A","at 220 V rated value":"1.2 A","at 230 V rated value":"6 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":"4","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Product Extension Auxiliary Switch":"No","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":"4","number of NO contacts for auxiliary contacts":"4","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":"44 E","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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","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":"$88.07 – $168.82","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ecf32d16a8309ac64507aef0576f7964.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=81468&mlfb=3RH2244-1BB40"},"ai":{"faq":[{"question":"What are the key contact ratings?","answer":"Each NO contact is rated 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. The coil is 24 VDC, 4 W pickup and holding."},{"question":"Will this drop into a panel spec'd around a 3RT2028-1BB40?","answer":"Yes — both are S00 size on the same DIN rail footprint. The 3RH2244-1BB40 is an auxiliary contactor that sits alongside the 3RT2028 power contactor without rewiring the mounting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2244-1BB40","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/3RH2244-1BB40 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}}