{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2902-1AB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2902-1AB4","canonicalUrl":"https://aoctrl.com/siemens/3RV2902-1AB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2902-1AB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS undervoltage release, 24 V DC, screw-type terminals, for 3RV2 motor circuit breakers, snap-on DIN rail mount, 690 V rated insulation, 20 ms break time.","salesMarkdown":"It's the part that makes a motor starter fail-safe on a power dip or emergency-stop string — the coil holds at 24 V DC nominal, and when that supply goes, the release mechanically opens the breaker within 20 ms. The 20 ms break time means the motor sees a clean disconnect before a partial-voltage stall can draw locked-rotor current. ## Snap-on DIN integration for 3RV2 frame sizes Mounts via snap-on fastening directly onto the side of a 3RV2 motor circuit protector — no tools, no DIN rail adapter. It fits the S00, S0, S2, and S3 frame sizes, so one accessory covers the whole 3RV2 family from the smallest 0.1 A protector up to the 100 A class. The 19 mm width adds exactly one modular unit to the breaker's footprint. In a crowded panel that's the difference between fitting a second starter row or needing a wider enclosure. Screw-type terminals on the control circuit accept standard ferrule-ended wire; strip length follows the 3RV2 terminal spec. ## Lifecycle and compliance — active, RoHS, no LTB pressure This is a current-production Siemens accessory, so the supply chain is stable. For a panel builder wiring a 3RV2-based motor starter group, the 3RV2902-1AB4 is the specified undervoltage release — no substitution needed.","metaTitle":"Siemens 3RV2902-1AB4 SIRIUS Undervoltage Release, 24 V DC, S","metaDescription":"Siemens 3RV2902-1AB4 SIRIUS undervoltage release, 24 V DC, screw terminals for 3RV2 breakers. 690 V rated, 20 ms break time, snap-on DIN mount. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"68 mm","Width":"19 mm","title":"3RV2902-1AB4","Height":"90 mm","Rated Value":"690 V","description":"Undervoltage release 24 V DC with screw terminal for circuit breaker 3RV2","During Storage":"-50 ... +80 °C","Leading Contact":"0","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","Fastening Method":"snap-on mounting","at DC rated value":"24 V","Break Time Maximum":"20 ms","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Product Designation":"undervoltage release","Suitability For Use":"motor circuit breaker","Instantaneous Contact":"0","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Substance Prohibitance (Date)":"05/01/2012","Design Of Short-Circuit Protection":"fuse","reference code according to EN 61346-2":"F","with degree of pollution 3 at AC rated value":"690 V","Type Of Voltage Of The Control Supply Voltage":"DC","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","number of CO contacts of auxiliary contacts instantaneous contact":"0","number of NC contacts for auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$48.26","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5c78c01fc034d0de7d2433775f693b75.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=217850&mlfb=3RV2902-1AB4"},"ai":{"faq":[{"question":"What is the 3RV2902-1AB4's depth on this component line?","answer":"The listed depth is 68 mm, with a width of 19 mm and height of 90 mm. That 19 mm width adds one modular unit to the 3RV2 breaker's footprint."},{"question":"Where can I buy the 3RV2902-1AB4?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 3RV2902-1AB4?","answer":"The part carries a RoHS substance prohibition date of 05/01/2012 and is coded per EN 61346-2 as function F (protective device). It is rated for pollution degree 3 and 690 V insulation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2902-1AB4","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/3RV2902-1AB4 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}}