{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2344-1BG40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2344-1BG40","canonicalUrl":"https://aoctrl.com/siemens/3RH2344-1BG40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2344-1BG40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2344-1BG40 auxiliary contactor, size S00, 4 NO instantaneous contacts, 125 V DC coil, screw and snap-on mounting on 35 mm DIN rail, 45 x 57.5 x 117 mm.","salesMarkdown":"## S00 frame, 4 NO contacts, 125 V DC coil The Siemens 3RH2344-1BG40 is a SIRIUS auxiliary contactor in the S00 frame size, carrying 4 normally-open instantaneous contacts and a 125 V DC magnet coil. This is the part you reach for when the main contactor's auxiliary block is full and you need to mirror a status back to the PLC or latch a holding circuit without adding another power contactor. The coil draws 4 W both on pickup and hold — no economizer circuit needed, the DC coil holds at full power continuously. That 4 W steady-state load matters if you're stacking several of these in a panel with limited heat dissipation. ## Rated operational current across the voltage range The 690 V rating is 1 A. These are the AC-15 / DC-13 utilization category figures for the auxiliary contacts — the switching capacity drops as voltage climbs because the arc energy grows faster than the contact gap can quench. For DC switching, the arcing time runs 10 to 15 ms with a 7 to 13 ms dropout delay — the DC arc doesn't self-extinguish at zero-crossing, so the contact material and arc-chute geometry are tuned for that window. If you're switching inductive DC loads (brake coils, solenoid valves), verify the load's L/R time constant against the contactor's DC breaking capability. RoHS compliant with a substance prohibition date of 07/01/2006 — meets the original EU RoHS directive. The mechanical endurance is 10 million switching cycles typical, which for a purely auxiliary switching load (PLC inputs, contactor coils, signal lamps) translates to a long service life in normal cycling duty.","metaTitle":"Siemens 3RH2344-1BG40 SIRIUS Auxiliary Contactor","metaDescription":"Siemens 3RH2344-1BG40 SIRIUS auxiliary contactor, size S00, 4 NO instantaneous contacts, 125 V DC coil. Screw and snap-on mounting on 35 mm DIN rail.","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":"3RH2344-1BG40","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 with auxiliary switch 125 V DC Size S00, screw terminal, 4 NC basic unit / EN","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)":"07/01/2006","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","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","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/463f01645499dcd61de27b3adf78c917.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=642830&mlfb=3RH2344-1BG40"},"ai":{"faq":[{"question":"What is the closest pin-compatible alternative to 3RH2344-1BG40 in this Contactors family?","answer":"Within the SIRIUS S00 family, the 3RH2344-1BG40 is distinguished by its 125 V DC coil and 4 NO contact configuration. The closest sibling is the 3RH2344-1BB40 (24 V DC coil) or the 3RH2344-1BG20 (125 V DC, 2 NO + 2 NC) — same frame, same mounting, same terminal layout, same S00 footprint. The coil voltage and contact arrangement are the only variables; the mechanical and electrical ratings for the contact block itself are identical across the 3RH2344 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2344-1BG40","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/3RH2344-1BG40 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}}