{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5975-5AD31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5975-5AD31","canonicalUrl":"https://aoctrl.com/siemens/3RT5975-5AD31","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5975-5AD31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, Magnet coil, 3RT5975-5AD31, 48 V AC/DC, for size S12 contactors.","salesMarkdown":"The Siemens SIRIUS 3RT5975-5AD31 is a replacement magnet coil for size S12 contactors. It's the part that pulls the contactor in and holds it closed — when the coil fails, the contactor drops out regardless of the main contacts' condition. Rated for 48 V AC/DC control supply voltage, so it works on either a 48 VAC control transformer or a 48 VDC power supply without rewiring the coil circuit. The 50 Hz and 60 Hz rated values both land at 48 V — no derating needed when switching between line frequencies. Size S12 is a large-frame contactor class in the SIRIUS family — typically used for motor loads in the 100+ A range. This coil is the service part you order when the original coil on an S12 contactor opens, shorts, or draws excessive holding current. It's not a standalone component; it mounts into the contactor's magnet system. Because it's a current-production service part, availability is generally steady. ## What the 48 V AC/DC rating means on the panel The AC/DC control supply voltage type means this coil accepts both AC and DC without a separate rectifier module. On a 48 VDC control bus — common in battery-backed or UPS-fed panels — the coil holds in cleanly. On a 48 VAC transformer, same part, same wiring. Just verify the control supply is within the coil's operating range (typically 0.8–1.1 × rated voltage for SIRIUS contactor coils). For the panel builder: the coil's inrush and holding power draw determine the control transformer sizing. On a 48 VAC system, the apparent pick-up power of an S12 coil runs several hundred VA momentarily; the holding power drops to a fraction of that. Make sure the control transformer can supply the inrush without dipping below the dropout threshold.","metaTitle":"Siemens 3RT5975-5AD31 SIRIUS Magnet Coil, 48 V AC/DC","metaDescription":"Siemens SIRIUS 3RT5975-5AD31 magnet coil for size S12 contactors. 48 V AC/DC control supply. Current lifecycle stage. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current","Product Brand Name":"SIRIUS","2 at DC rated value":"48 V","Product Designation":"Magnet coil","at 50 Hz rated value":"48 V","at 60 Hz rated value":"48 V","Type Of Voltage Of The Control Supply Voltage":"AC/DC"}},"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=580122&mlfb=3RT5975-5AD31","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5975-5AD31/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RT5975-5AD31 used for?","answer":"It is a replacement magnet coil for Siemens SIRIUS size S12 contactors. It provides the electromagnetic force to close and hold the contactor's main contacts."},{"question":"What voltage does the 3RT5975-5AD31 coil operate on?","answer":"It is rated for 48 V AC/DC. The 50 Hz and 60 Hz rated values are both 48 V, and the DC rated value is also 48 V."},{"question":"Where can I buy the 3RT5975-5AD31 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5975-5AD31","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/3RT5975-5AD31 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}}