{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-5GE42-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-5GE42-0AA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-5GE42-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5GE42-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-5GE42-0AA0, molded case circuit breaker (MCCB), 4-pole, 20 A, TM220 thermal-magnetic trip, 187 kA at 240 V, 70 mm depth.","salesMarkdown":"That 20 A holds steady from 40 °C all the way up to 55 °C — it doesn't start derating until 60 °C, where it drops to 19 A, and it holds 19 A through 70 °C. This matters if you're stuffing this breaker into a warm cabinet or a motor control center where ambient heat is a given; you don't lose headroom until the panel is genuinely hot. The interrupting ratings tell the real story for line-side fault coordination: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. For a site electrical engineer working on selective coordination, that's the spec that decides whether the next breaker downstream clears before this one trips. Power loss is 12 W maximum, which is modest for a 4-pole 20 A MCCB and won't cook adjacent components in a dense DIN-rail layout. The 101.6 mm width (4 inches) is the space you need to budget on the DIN rail — for a panel OEM wireman, that's four inches of rail you can't use for anything else per breaker. Plan your fill factor accordingly. The 4-pole configuration means this breaker switches all three phases plus the neutral. For a commissioning engineer, that's the right choice for a TN-S or TN-C-S system where you want the neutral isolated and protected alongside the line conductors. For an MRO planner stocking a spare for a line-down scenario, this breaker will sit on a shelf in a non-conditioned warehouse without issue. ## What it's for — deployment context It's not a motor-protective breaker with integrated overload class; it's a distribution MCCB. You'd find it in a main switchboard, a sub-distribution board, or as the incoming breaker in a motor control center bucket. For a field service tech swapping a failed unit, the TM220 trip unit is thermal-magnetic, so no external control power needed — it trips on its own internal mechanism.","metaTitle":"Siemens 3VA1120-5GE42-0AA0 SENTRON MCCB, 20A, 4-Pole, 187kA","metaDescription":"Siemens SENTRON 3VA1120-5GE42-0AA0 molded case circuit breaker, 20 A, 4-pole, TM220 trip, 187 kA at 240 V. Active production. Quoted to order. Sourced via independent channels.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"101.6 mm","Height":"130 mm","Maximum":"20 A","Minimum":"20 A","at 240 V":"187 kA","at 415 V":"121 kA","at 440 V":"75.6 kA","at 500 V":"17 kA","at 690 V":"17 kA","at 40 °C":"20 A","at 45 °C":"20 A","at 50 °C":"20 A","at 55 °C":"20 A","at 60 °C":"19 A","at 65 °C":"19 A","at 70 °C":"19 A","Depth [In]":"2.76 in","Width [In]":"4 in","Height [In]":"5.12 in","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Molded case circuit breaker","Undervoltage Release":"No","Design Of The Product":"Line protection","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"12 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Ground-Fault Monitoring Version":"Without","Insulation Voltage / Rated Value":"800 V","Design Of The Overcurrent Release":"TM220","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","design of the N-conductor protection":"100%","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 V","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","Protection Function Of The Overcurrent Release":"LI","number of CO contacts / for auxiliary contacts":"0","Switching Capacity Class Of The Circuit Breaker":"M","Mechanical Service Life (Operating Cycles) / Typical":"20 000","Type Of Electrical Connection / For Main Current Circuit":"nut keeper kit on both ends","Arrangement Of Electrical Connectors / For Main Current Circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6561282d063b2d57338d70b5ec1cdc98.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=259774&mlfb=3VA1120-5GE42-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5GE42-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3VA1120-5GE42-0AA0 and what is the lead time?","answer":"This part is sourced and quoted to order through independent distribution channels. Availability and current pricing are confirmed at quote time against an RFQ — no stock count or lead-time number is published here, but the supply channel is active."},{"question":"What is the breaking capacity of the 3VA1120-5GE42-0AA0 at 240 V?","answer":"The interrupting rating is 187 kA at 240 V. It also carries 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V."},{"question":"Will the 3VA1120-5GE42-0AA0 drop into a panel specified around the 3VA1110-5ED32-0AA0 without rewiring?","answer":"Both are 4-pole SENTRON MCCBs on the same 3VA platform, so the footprint and mounting pattern are identical. The 3VA1110-5ED32-0AA0 is a 32 A unit; the 3VA1120-5GE42-0AA0 is a 20 A unit. As long as the lower 20 A rating meets your load requirements, it will physically fit without panel modifications. No rewiring needed at the bus bars or load terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-5GE42-0AA0","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/3VA1120-5GE42-0AA0 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}}