{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-2FB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-2FB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-2FB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-2FB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RH2131-2FB40 auxiliary contactor, S00 size, 24 V DC coil with integrated suppression diode, 4 NO + 1 NC contacts, screw and snap-on 35 mm DIN rail mount.","salesMarkdown":"## Panel Fit and Coil Spec The Siemens 3RH2131-2FB40 is a SIRIUS S00 auxiliary contactor with a 24 V DC coil — the built-in suppression diode clips the flyback spike, so you don't need an external snubber across the coil terminals. That diode is wired in parallel inside the contactor housing; it's not a separate add-on. The S00 body is 45 mm wide, 73 mm deep, 70 mm tall — fits a standard 45 mm-wide slot in a control panel. Clearance: 10 mm above and below, 6 mm at the sides. ## Contact Ratings and Duty The contact block carries 4 NO + 3 NC instantaneous contacts. Rated operational current at 24 V is 10 A; at 230 V it's also 10 A. At 400 V the rating drops to 3 A, and at 690 V to 1 A — the arc extinction limits the higher-voltage current. Switching frequency is 10,000 cycles per hour at AC, with an arcing time of 10–15 ms. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C.","metaTitle":"Siemens 3RH2131-2FB40 SIRIUS Auxiliary Contactor","metaDescription":"Siemens 3RH2131-2FB40 SIRIUS auxiliary contactor, 24 V DC coil with built-in suppression diode. S00 size, 4 NO + 1 NC contacts. Screw and snap-on DIN rail","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":"38 ... 65 ms","title":"3RH2131-2FB40","Height":"70 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, 3 NO + 1 NC, 24 V DC, with integrated diode, Size S00, Spring-type 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 ... 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":"3","Relative Humidity Minimum":"10 %","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"diode","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","for AWG cables for auxiliary contacts":"2x (20 ... 12)","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"2x (0.5 ... 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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded 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":"$130.95","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3aabafbc9b6901489bddce157b03843d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=106110&mlfb=3RH2131-2FB40"},"ai":{"faq":[{"question":"Does 3RH2131-2FB40 include a suppression diode?","answer":"Yes, the surge suppressor design is a diode integrated into the contactor. It's wired across the coil internally, so the 24 V DC coil circuit is protected from the voltage spike when de-energised."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-2FB40","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/3RH2131-2FB40 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}}