{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1955-5QF31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1955-5QF31","canonicalUrl":"https://aoctrl.com/siemens/3RT1955-5QF31","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1955-5QF31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1955-5QF31, changeover operating mechanism for 3RT105/3RT145 contactors, electronic with AS-Interface and RLT signal, 96...127 V AC/DC magnet coil.","salesMarkdown":"The Siemens SIRIUS 3RT1955-5QF31 is a changeover operating mechanism designed specifically for the 3RT105 and 3RT145 contactor frames. It is an electronic magnet coil that accepts a control supply voltage of 96 to 127 V, operating on either AC (50/60 Hz) or DC. The coil integrates AS-Interface communication and an RLT signal, making it a drop-in component for contactor assemblies that require remote status feedback and bus-level control. The coil is rated for 127 V at both 50 Hz and 60 Hz, and for 96 V and 127 V on DC. This dual-frequency, dual-voltage AC/DC capability means the same coil works across 50 Hz and 60 Hz line supplies without a change in part number, and also accepts DC control circuits — useful in battery-backed or DC-distributed panels. The 96 V DC rating covers the lower end of common nominal DC bus voltages, while the 127 V DC rating matches the standard 110-125 V DC control voltage range used in many industrial installations. The electronic design with AS-Interface and RLT signal means this is not a simple solenoid coil — it contains onboard electronics for bus communication and status feedback. The RLT (Remote Local Trip) signal provides a discrete output that can be wired back to a PLC input or annunciator panel, giving the maintenance team a direct indication of the contactor's state without needing to open the cabinet door. This mechanism mounts onto the 3RT105 or 3RT145 contactor frame. Those are large-frame contactors (size S6 and up) typically used for motor loads above 100 A or for heavy-duty switching. The changeover mechanism replaces the standard coil assembly, so the panel layout and wiring to the contactor's main power terminals remain unchanged. The AS-Interface connection requires a bus drop cable run to the nearest AS-i segment; the RLT signal is a two-wire dry contact output.","metaTitle":"SIRIUS 3RT1955-5QF31 Magnet Coil, 96-127 V AC/DC, Changeover","metaDescription":"SIRIUS 3RT1955-5QF31 changeover operating mechanism for 3RT105/3RT145 contactors. 96-127 V AC/DC magnet coil with AS-Interface and RLT signal. Lifecycle stage: current.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"title":"3RT1955-5QF31","description":"Changeover operating mechanism for contactors 3RT105, 3RT145 AC (50...60 Hz) / DC operation, 96... 127 V Operating mechanism: electronic with AS-Interface and RLT signal","lifecycle_stage":"current","Product brand name":"SIRIUS","1 at DC rated value":"96 V","2 at DC rated value":"127 V","Product designation":"Magnet coil","at 50 Hz rated value":"127 V","at 60 Hz rated value":"127 V","Type of voltage of the control supply voltage":"AC/DC"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ef3279d8e16f558e258e3c3d2a9a2c75.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=423603&mlfb=3RT1955-5QF31"},"ai":{"faq":[{"question":"What contactors does this changeover operating mechanism fit?","answer":"It is designed for the Siemens SIRIUS 3RT105 and 3RT145 contactor frames. These are large-frame contactors (size S6) used for high-current motor loads."},{"question":"What voltage does the coil accept?","answer":"The coil accepts 96 to 127 V on DC, and 127 V on AC at both 50 Hz and 60 Hz. The control supply voltage type is AC/DC, so the same coil works on either supply."},{"question":"Does this coil include AS-Interface communication?","answer":"Yes. The description states it is an electronic operating mechanism with AS-Interface and an RLT signal, providing bus-level control and a remote local trip feedback output."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1955-5QF31","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/3RT1955-5QF31 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}}