{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6AG1931-2FC21-7AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6AG1931-2FC21-7AA0","canonicalUrl":"https://aoctrl.com/siemens/6AG1931-2FC21-7AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6AG1931-2FC21-7AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 6AG1931-2FC21-7AA0 — now in phase-out and being discontinued. Supplied from remaining channel stock; full specifications, lifecycle and same-series options are below.","salesMarkdown":"## Overview The 6AG1931-2FC21-7AA0 is a Siemens SIPLUS PS DC UPS module rated for 40 A continuous current, accepting a 24 V DC input and delivering a buffered output with a switching current of 42 A. This module bridges a 24 V DC power supply and a battery energy storage, providing uninterrupted DC power during mains dips or failures. In normal operation the green OK LED and the floating changeover contact indicate the supply voltage is above the cut-in threshold. When the input drops, the module switches to buffered mode — the yellow Bat LED and the OK/Bat contact signal the transition. A prewarning threshold at 20.4 V DC triggers the red alarm LED and the Alarm/Bat contact, giving the control system time for an orderly shutdown. The module also reports energy storage above 85% via a dedicated green LED and a normally-open contact. Rated at 40 A continuous input current with a 42 A switching capability, the module handles the inrush of downstream loads and battery charging simultaneously. The output voltage follows the input minus approximately 0.5 V, so the load sees nearly the same rail voltage during normal operation. A typical startup delay of 1000 ms allows the upstream supply to stabilise before the module engages the load. The module snaps onto a DIN rail per EN 60715 (35 x 7.5/15) and uses screw-type terminals for field wiring. Its enclosure measures 13.5 x 15.00 x 11.00 cm and weighs 1100 g, occupying a single unit width on the rail. The IP20 rating suits clean, dry cabinet environments. Ambient temperature range of -40 to +85 °C and 100% humidity tolerance (including diesel and oil droplets in the air) make it suitable for harsh industrial and outdoor-adjacent installations. Altitude derating applies above 6000 m.","metaTitle":"Siemens 6AG1931-2FC21-7AA0 SIPLUS PS DC UPS module 40 A","metaDescription":"Siemens SIPLUS PS DC UPS module 40 A, order code 6AG1931-2FC21-7AA0, 24 V DC input, 40 A rated current, 42 A switching current, IP20, DIN-rail mount, -40 to +85 °C.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"Top":"50 mm","Left":"0 mm","Right":"0 mm","Bottom":"50 mm","At Input":"24 V DC: 2 screw terminals for 0.33 ... 10 mm²/22 ... 7 AWG","At Output":"24 V DC: 2 screw terminals for 0.33 ... 10 mm²/22 ... 7 AWG","CE marking":"Yes","Rated Value":"40 A","Peak Current":"42 A","MTBF at 40 °C":"522 739 h","lifecycle_stage":"current","Charging Current":"1 A, 2 A","Fastening Method":"Snaps onto DIN rail EN 60715 35x7.5/15","In Buffering Mode":"Buffered mode: LED yellow (Bat), floating changeover contact \"OK/Bat\" to setting \"Bat\"; Prewarning battery voltage < 20.4 VDC: LED red (alarm), floating changeover contact \"Alarm/Bat\" to setting \"Alarm\"; Energy storage > 85%: LED green (Bat > 85%), floating NO contact \"Bat > 85\" closed","Other Information":"Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)","In Normal Operation":"0 ... 40 A","Input Voltage Range":"22 ... 29 V DC","protection class IP":"IP20","For Normal Operation":"Normal operation: LED green (OK), floating changeover contact \"Bat/OK\" to setting \"OK\" (\"OK\" means: Voltage of the supplying power supply unit is greater than cut-in threshold set at the DC UPS module); Lack of buffer standby: LED red (alarm), floating changeover contact \"Alarm/Bat\" to setting \"Alarm\"; Battery replacement required: LED red (alarm) flashing with approx. 0.25 Hz, floating changeover contact \"Alarm/Bat\" switching with approx. 0.25 Hz; Energy storage > 85%: LED green (Bat > 85%), floating NO contact \"Bat > 85\" closed; Permissible contact current capacity: DC 60 V/1 A or AC 30 V /1 A","Depth Of The Enclosure":"125 mm","Electrical Accessories":"Battery module","Type Of Energy Storage":"with batteries","Voltage Curve At Input":"DC","Width Of The Enclosure":"102 mm","Design Of The Interface":"without","Height Of The Enclosure":"125 mm","For Emitted Interference":"EN 55022 Class B","For Interference Immunity":"EN 61000-6-2","Formula For Output Voltage":"Vin - approx. 0.5 V","Startup Delay Time Typical":"1 s","Supplied Active Power Typical":"960 W","Type Of Electrical Connection":"screw-type terminals","product component PC interface":"No","For Rechargeable Battery Module":"24 V DC: 2 screw terminals for 0.33 ... 10 mm²/22 ... 7 AWG","supply voltage at DC rated value":"24 V","Operating Resource Protection Class":"Class III","in buffering mode at DC rated value":"24 V","in normal operation at DC rated value":"24 V","For Control Circuit And Status Message":"10 screw terminals for 0.5 ... 2.5 mm²/20 ... 13 AWG","output voltage in buffering mode at DC":"19 ... 28.5 V","reference code according to IEC 81346-2":"RB","Adjustable Charging Current Maximum Note":"factory setting approx. 2 A","Galvanic Isolation Between Input And Output":"No","Ambient Temperature During Storage And Transport":"-40 ... +85","Design Of The Mains Power Cut Bridging-Connection":"Dependent on connected battery and load current, see selection table battery module and mains buffering times as well as the relevant important information notes!","Voltage Increase Time Of The Output Voltage Typical":"360 ms","In Case Of Operation On Rechargeable Battery Typical":"33.6 W","input current at rated input voltage 24 V rated value":"40 A; + approx. 2.6 A with empty battery","Adjustable Response Value Voltage For Buffer Connection":"22 ... 25.5 V; Adjustable in 0.5 V increments","Installation Altitude At Height Above Sea Level Maximum":"6 000 m","Product Feature Of The Enclosure Housing Can Be Lined Up":"Yes","Adjustable Response Value Voltage For Buffer Connection Preset":"22.5 V","Chemical Resistance To Commercially Available Cooling Lubricants":"Yes; incl. diesel and oil droplets in the air","Reverse Polarity Protection Against Input Voltage Polarity Reversal":"Yes","Ambient Temperature In Horizontal Mounting Position During Operation":"-25 ... +70; with natural convection","At Rated Output Voltage For Rated Value Of The Output Current Typical":"28.6 W","Reverse Polarity Protection Against Energy Storage Unit Polarity Reversal":"Yes","Ambient Condition Relating To Ambient Temperature - Air Pressure - Installation Altitude":"In case of operation at altitudes of 2000 - 6000 m above sea level: Output power derating of -7.5 %/1000 m or reduction of the ambient temperature by 5 K/1000 m","product conformity of the coating Qualification and Performance of Electrical Insulating Compound for Printed Board Assemblies according to IPC-CC-830A":"Yes; Conformal Coating, Class A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$684.53","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a12d473f9ec8aa441bfb758949dfc7dd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=514908&mlfb=6AG1931-2FC21-7AA0"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6AG1931-2FC21-7AA0","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/6AG1931-2FC21-7AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-06-26T19:24:34.313Z","lastPublished":"2026-06-26T19:24:34.313Z","indexable":true}}