{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-1HB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-1HB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-1HB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-1HB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2131-1HB40 coupling relay for switching auxiliary circuits, 24 VDC coil, 10 A rated current, 3 NO contacts, S00 frame size, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## What this coupling relay does that a standard contactor cannot The 3RH2131-1HB40 is a SIRIUS coupling relay — Siemens designates it specifically for switching auxiliary circuits, not main motor loads. The arcing time runs 10 to 15 ms, so the downstream input filter on a safety PLC or fast counter must be set wider than that window to avoid false edges. Mechanical endurance is rated 30 million switching cycles typical, and the maximum switching frequency at AC is 10,000 operations per hour — the DC switching frequency is bounded by the 7 to 20 ms on-time, not a per-hour ceiling. For high-cycle applications like pick-and-place or conveyor indexing, the 30-million-cycle figure gives you a service-life budget before the contacts need replacement. ## Mounting and environmental fit The relative humidity floor is 10 %, so it handles dry climates as well as humid enclosures.","metaTitle":"Siemens 3RH2131-1HB40 SIRIUS Coupling Relay, 24 VDC, 10 A","metaDescription":"Siemens 3RH2131-1HB40 SIRIUS coupling relay, 24 VDC coil, 10 A rated current, 3 NO contacts, S00 frame, screw and snap-on DIN rail mount. Active production.","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 ... 20 ms","title":"3RH2131-1HB40","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":"Coupling contactor relay, 3 NO + 1 NC, 24 V DC, 0.7... 1.25* US, Size S00, screw terminal suitable for PLC outputs","Initial Value":"0.7","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":"1.25","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":"Coupling relay for switching auxiliary circuits","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":"3","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"2.8 W","holding power of magnet coil at DC":"2.8 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":"3","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":"31 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":"$21.59","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b55f017eb1f39374aa2c2b183d35bca3.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=505104&mlfb=3RH2131-1HB40"},"ai":{"faq":[{"question":"Will 3RH2131-1HB40 drop into a panel specified around 3RH2131-1AH00 without rewiring?","answer":"Both are SIRIUS S00 coupling relays with the same 45 mm width, 57.5 mm height, 73 mm depth, and screw/snap-on DIN rail mounting. The 3RH2131-1AH00 uses a 230 VAC coil; the 1HB40 uses a 24 VDC coil. The physical footprint and terminal layout are identical — the swap requires changing the coil supply voltage, not rewiring the contact terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-1HB40","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/3RH2131-1HB40 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}}