{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA1225-0KB23-1BB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA1225-0KB23-1BB4","canonicalUrl":"https://aoctrl.com/siemens/3RA1225-0KB23-1BB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA1225-0KB23-1BB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 reversing combination starter, 3RA1225-0KB23-1BB4, 0.9-1.25 A, 110 VDC control, DIN/panel mount, UL listed.","salesMarkdown":"The Siemens 3RA1225-0KB23-1BB4 is a reversing combination starter in the SIRIUS S0 frame, rated for 0.9-1.25 A with a 110 VDC control voltage. It integrates a reversing contactor pair, overload relay, and short-circuit protection into one DIN-rail or panel-mount package — a common choice for controlling small reversing motor loads like conveyor drives or actuator gates in IEC panels. The 0.9-1.25 A current range sets the motor FLA it can handle — size the overload relay dial within that window to match the motor nameplate. The 110 VDC control voltage means the coil pulls in on a 110 VDC supply; verify your control transformer or DC power supply delivers that, not 110 VAC, because the coil is DC-rated and an AC supply will not hold it in (or may damage it). The S0 frame size determines the mounting footprint and busbar spacing — it shares the same 45 mm width and DIN-rail clip pattern as other S0 SIRIUS gear, so it swaps into existing S0 panels without re-drilling. The auxiliary contact configuration includes one SPDT NO/NC contact on the MSP (motor starter protection) block plus one NO front-mount contactor auxiliary — enough for a run-status signal to a PLC or a seal-in circuit for the reversing logic. The UL file E156943 Vol.1 Sec.14 confirms UL listing for North American installations, so it passes a panel shop inspection without a separate UL component review.","metaTitle":"Siemens 3RA1225-0KB23-1BB4 Reversing Combination Starter","metaDescription":"Siemens 3RA1225-0KB23-1BB4 reversing combination starter, SIRIUS S0 frame, 0.9-1.25A, 110 VDC control. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Part #":"3RA1225-0KB23-1BB4","Weight":"1.81 kgs","Category":"Contactors and Starters","Sub Category":"Contactor & Starter Accessories & Parts","Top Category":"Circuit Breakers, Fuses & Protection","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$832.46","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=234712&mlfb=3RA1225-0KB23-1BB4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA1225-0KB23-1BB4/alternatives.json"},"ai":{"faq":[{"question":"Is the Siemens 3RA1225-0KB23-1BB4 compatible with 110 VAC control?","answer":"No. The coil is rated for 110 VDC only. Using 110 VAC will not provide the holding current a DC coil requires and risks overheating or failure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA1225-0KB23-1BB4","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/3RA1225-0KB23-1BB4 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}}