{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV5902-1AP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV5902-1AP0","canonicalUrl":"https://aoctrl.com/siemens/3RV5902-1AP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RV5902-1AP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS undervoltage release, 230 V AC 50 Hz / 240 V AC 60 Hz, for circuit breakers sizes S00, S0, S2, S3, screw connection, snap-on mounting, IP20 finger-safe front.","salesMarkdown":"The Siemens 3RV5902-1AP0 is a SIRIUS undervoltage release — a bolt-on accessory for motor circuit breakers. It sits on the breaker's side, wired in series with the control supply, and drops the main contacts the instant its coil voltage falls below the dropout threshold. Rated for 230 V at 50 Hz and 240 V at 60 Hz, AC control supply only. The 50/60 Hz dual-frequency rating means it works on either grid without a jumper change — one part number covers both common line frequencies. Insulation voltage is 690 V with pollution degree 3, which is the standard industrial panel environment (conductive pollution, occasional condensation). ## Breaker fit and panel integration This release fits S00, S0, S2, and S3 frame sizes of the 3RV2 motor circuit breaker series. That's the full range from the compact S00 (up to about 16 A motor protection) up through the S3 (around 100 A). The screw connection terminals match the breaker's own terminal style — same screwdriver tip, same torque range. Width is 18.5 mm, depth 68 mm, height 90 mm. It's a narrow add-on — doesn't push the breaker outside its standard mounting footprint. The front is finger-safe to IP20 per IEC 60529, so it meets the touch-protection requirement for accessible panel fronts without needing a separate cover. The 230/240 V AC rating is the coil operating voltage, not a main circuit rating. It's the voltage that keeps the release picked up. Dropout happens somewhere below about 0.7 × rated — so at 230 V nominal, the release drops the breaker if the control voltage sags below roughly 160 V. That's the undervoltage protection function: it doesn't trip on a momentary blip, but it does clear the breaker on a sustained brownout or loss of control power. The storage range is wider because the part isn't dissipating heat when boxed. In a panel, keep ambient below 60 °C or derate per the thermal curve. The -20 °C floor means it's fine for unheated electrical rooms in most climates, but not for freezer or arctic outdoor applications without a heater.","metaTitle":"Siemens 3RV5902-1AP0 SIRIUS Undervoltage Release, 230/240 VA","metaDescription":"Siemens 3RV5902-1AP0 SIRIUS undervoltage release, 230 VAC 50 Hz / 240 VAC 60 Hz. For S00/S0/S2/S3 circuit breakers. Snap-on DIN rail. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"68 mm","Width":"18.5 mm","Height":"90 mm","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","Fastening Method":"snap-on mounting","Final Rated Value":"60 Hz","Product Brand Name":"SIRIUS","Degree Of Pollution":"3","Initial Rated Value":"50 Hz","Product Designation":"undervoltage release","Suitability For Use":"motor circuit breaker","at 50 Hz rated value":"230 V","at 60 Hz rated value":"240 V","Size Of The Circuit-Breaker":"S00, S0, S2, S3","Insulation Voltage Rated Value":"690 V","Design Of Short-Circuit Protection":"fuse","reference code acc. to DIN EN 61346-2":"F","Type Of Voltage Of The Control Supply Voltage":"AC","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","protection class IP on the front acc. to IEC 60529":"IP20","number of NO contacts for auxiliary contacts leading contact":"0","insulation voltage with degree of pollution 3 at AC rated value":"690 V","number of CO contacts of auxiliary contacts instantaneous contact":"0","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5fcb2397b8d4db49fdebfbe632f6bdee.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621621&mlfb=3RV5902-1AP0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV5902-1AP0/alternatives.json"},"ai":{"faq":[{"question":"What breaker sizes does 3RV5902-1AP0 fit?","answer":"It fits S00, S0, S2, and S3 frame sizes of Siemens 3RV2 motor circuit breakers."},{"question":"Will 3RV5902-1AP0 drop into a panel built around a 3RV1011-0GA10 breaker?","answer":"No — the 3RV5902-1AP0 is an undervoltage release accessory for the 3RV2 motor circuit breaker family, while the 3RV1011-0GA10 is a complete motor circuit protector in the 3RV1 series. They are different product classes and not mechanically interchangeable."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV5902-1AP0","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/3RV5902-1AP0 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}}