{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RH2131-4BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RH2131-4BB40","canonicalUrl":"https://aoctrl.com/siemens/3RH2131-4BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RH2131-4BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS auxiliary contactor, size S00, 3RH2131-4BB40, 24 VDC coil, 3 NO instantaneous contacts, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"The Siemens SIRIUS 3RH2131-4BB40 is a size S00 auxiliary contactor with three normally open instantaneous contacts, driven by a 24 VDC coil that draws 4 W closing and 4 W holding power. It mounts via screw or snap-on onto 35 mm DIN rail, occupying a 45 mm wide footprint with a depth of 73 mm and height of 57.5 mm — a compact slice for control-panel builders packing auxiliary circuits into tight enclosures. ## Switching capacity across voltage classes The contact ratings are given per voltage, not as a single blanket current. DC switching at 24 V is rated 10 A, at 60 V 4.7 A, at 220 V 1.2 A, and at 600 V 0.26 A. These numbers define the load envelope — a wireman sizing the contactor for a mixed-voltage panel reads the row that matches the circuit voltage, not the highest figure on the table. These spacing rules govern gland-plate layout and side-by-side density — a panel builder derating for heat or arc flash respects the 6 mm side gap even when rail space is tight. ## Mechanical endurance and arcing Arcing time spans 10 to 15 ms; the maximum switching frequency at AC is 10,000 operations per hour. At DC the minimum on-time is 7 to 13 ms. These timing specs matter for a controls integrator coordinating the contactor with a PLC scan cycle or a safety relay's off-delay.","metaTitle":"Siemens SIRIUS 3RH2131-4BB40 Auxiliary Contactor, S00, 24 VD","metaDescription":"Siemens SIRIUS 3RH2131-4BB40 auxiliary contactor, size S00, 24 VDC coil, 3 NO contacts. Screw and snap-on DIN rail mounting. Rated switching capacity up to 10 A at 230 V. Current l","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","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","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","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","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","reference code according to IEC 81346-2":"K","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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Type Of Electrical Connection For Auxiliary And Control Circuit":"ring terminal lug connection","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=414708&mlfb=3RH2131-4BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RH2131-4BB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RH2131-4BB40?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send the quantity and target delivery window."},{"question":"What is the closest functional alternative to 3RH2131-4BB40?","answer":"The 3RH2122-1BA40 is a size S00 auxiliary contactor with a different contact arrangement (2 NO + 2 NC versus the 3 NO of 3RH2131-4BB40) and a 24 VDC coil. It shares the same DIN-rail footprint and S00 frame, so it drops into the same panel location without rewiring the base, but the contact count differs — verify your circuit's NO/NC needs before swapping."},{"question":"What compliance documentation does Siemens provide for 3RH2131-4BB40?","answer":"The part carries a RoHS compliance date of 10/01/2009 and a degree of pollution rating of 3 per IEC 60947-1. Standard Siemens documentation includes the declaration of conformity and the CE mark; UL and CSA listings are typical for the SIRIUS series but should be confirmed per the specific catalog number at time of order."},{"question":"Will 3RH2131-4BB40 drop into a panel specified around 3RH2122-1BA40 without rewiring?","answer":"Yes, both are size S00 auxiliary contactors with screw and snap-on mounting on 35 mm DIN rail, sharing the same 45 mm width, 73 mm depth, and 57.5 mm height. The coil voltage is identical at 24 VDC. The only difference is the contact arrangement — 3 NO on the 3RH2131-4BB40 versus 2 NO + 2 NC on the 3RH2122-1BA40 — so the base wiring and DIN slot are compatible, but the circuit logic changes if the original design used the NC contacts."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RH2131-4BB40","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/3RH2131-4BB40 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}