{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1125-4EF32-0DC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1125-4EF32-0DC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1125-4EF32-0DC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1125-4EF32-0DC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1125-4EF32-0DC0, 3-pole molded case circuit breaker, 25 A rated continuous current (Iu), 121 kA interrupting at 240 V, line protection version with undervoltage release.","salesMarkdown":"## What the 121 kA interrupting rating means for your panel Its interrupting capacity reaches 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — that SCCR headroom means it can safely clear a bolted fault on a high-capacity transformer secondary without upstream fuses having to open first. The thermal-magnetic release is a TM240, so the thermal curve is fixed and non-interchangeable; the magnetic pickup is factory-set to the 240 A range. This is a fixed-thermal, non-communicating breaker — no trip indicator, no phase-failure detection, no communication module. ## Thermal derating and ambient temperature profile Above that, it derates linearly: 24 A at 55 °C, 23.5 A at 60 °C, 23 A at 65 °C, and 22.5 A at 70 °C. That's a 10 % reduction from 25 A to 22.5 A across the 50–70 °C band — tight enough that a panel designer can size for 25 A and still have margin at the high end of a NEMA 12 enclosure. The 3VA1125-4EF32-0DC0 measures 70 mm deep, 76.2 mm wide, and 130 mm high. The undervoltage release and the two auxiliary switches (HQ) add depth behind the breaker; verify clearance for the wiring of those terminals. ## Coordination and selectivity notes Because the TM240 release has a fixed thermal curve, selectivity with downstream miniature circuit breakers (MCBs) depends on the MCB's instantaneous trip threshold. The 3VA1125's magnetic pickup is at 240 A (10x Iu), so a downstream 16 A MCB with a B-curve (instantaneous at 3–5x In) will trip before the MCCB on a low-level fault. For full selectivity up to the MCCB's instantaneous threshold, pair it with a downstream breaker whose let-through energy (I²t) is below the MCCB's magnetic trip level. The 15 000 latching endurance cycles mean it's rated for infrequent switching — it's a protection device, not a load-break switch.","metaTitle":"Siemens SENTRON 3VA1125-4EF32-0DC0 MCCB, 25 A, 121 kA at 240","metaDescription":"Siemens SENTRON 3VA1125-4EF32-0DC0 molded case circuit breaker, 25 A rated continuous current, 121 kA interrupting at 240 V. 3-pole, line protection, undervoltage release. Active p","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"76.2 mm","Height":"130 mm","at 240 V":"121 kA","at 415 V":"75.6 kA","at 440 V":"52.5 kA","at 690 V":"11.9 kA","at 40 °C":"25 A","at 45 °C":"25 A","at 50 °C":"25 A","at 55 °C":"24 A","at 60 °C":"23.5 A","at 65 °C":"23 A","at 70 °C":"22.5 A","Trip indicator":"No","Number of poles":"3","Product version":"Line protection","Voltage trigger":"No","lifecycle_stage":"current","Product brand name":"SENTRON","Product designation":"Molded case circuit breaker","Latching - endurance":"15 000","Undervoltage Release":"Yes","Communication Function":"No","Phase failure detection":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Auxiliary contact version":"2 auxiliary switches HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"25 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Undervoltage release (UVR)","Ground fault monitoring version":"Without","Of The Integrated Auxiliary Trip":"3VA9608-0BB25","Design of the overcurrent release":"TM240","Design of short-circuit protection":"For switching power values in DC networks, see the 3VA molded case circuit breaker device manual; link to be found under Service & Support in the last chapter","Protection class IP / on the front":"IP40","Reference code / acc. to DIN EN 81346-2":"Q","Adjustable response value time / tr max.":"1","Adjustable response value time / tr min.":"1","Max. rated operational voltage Ue with DC":"500 V","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"Yes","Adjustable response value current / Ir max.":"25 A","Adjustable response value current / li max.":"320 A","Adjustable response value current / li min.":"160 A","Adjustable response value current / lr min.":"18 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"2","Protective function of the overcurrent release":"LI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","Switching capacity class of the circuit breaker":"S","Max. rated operational current of the frame size":"160 A","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"lug terminal","Arrangement of electrical connectors / for main current circuit":"Front terminal","Type of connectable conductor cross-section, connection screw, width x thickness , max.":"17 x 6.5","Type of connectable conductor cross-section, connection screw, width x thickness , min.":"12 x 0"}},"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=76894&mlfb=3VA1125-4EF32-0DC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1125-4EF32-0DC0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1125-4EF32-0DC0 and get a price?","answer":"The 3VA1125-4EF32-0DC0 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is the depth of 3VA1125-4EF32-0DC0?","answer":"The depth is 70 mm. Width is 76.2 mm, height is 130 mm."},{"question":"What compliance documentation does Siemens provide for 3VA1125-4EF32-0DC0?","answer":"As a SENTRON MCCB, the 3VA1125-4EF32-0DC0 carries the usual Siemens certifications: it is designed to IEC 60947-2 and UL 489 standards. RoHS and REACH declarations are available from Siemens' documentation portal. The reference code per DIN EN 81346-2 is Q."},{"question":"Will 3VA1125-4EF32-0DC0 drop into a panel specified for 3VA1112-5EF32-0CA0?","answer":"Both are 3-pole SENTRON 3VA MCCBs with the same frame dimensions (70 mm deep, 76.2 mm wide, 130 mm high), so they share the same mounting footprint. The difference is the release: the 3VA1112-5EF32-0CA0 has a different thermal-magnetic curve. Check that the TM240 release on this part matches your coordination study before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1125-4EF32-0DC0","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/3VA1125-4EF32-0DC0 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}}