{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-5EF32-0HC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-5EF32-0HC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-5EF32-0HC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5EF32-0HC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-5EF32-0HC0, molded case circuit breaker, 3-pole, 20 A rated at 40 °C, 187 kA breaking capacity at 240 V AC, line protection design with shunt trip (STL) and 2 auxiliary switches HQ.","salesMarkdown":"The 187 kA at 240 V tells you this breaker is sized for the high-end of SCCR requirements on 240 V delta or 240/120 V center-tapped services. Drop to 415 V and it still holds 121 kA; at 440 V it's 75.6 kA; at 500 V and 690 V it holds 17 kA. That curve means the breaker clears fast enough to protect downstream gear across a wide voltage range without cascading failure — useful when the same panel feeds both 480 V and 240 V loads through separate transformers. The 20 A rating holds flat from 40 °C through 55 °C, then derates to 19 A at 60–70 °C — no surprise for a thermal-magnetic MCCB, but worth noting if the breaker lives in a hot enclosure next to a transformer or drive. ## Auxiliary and shunt trip fit The shunt trip lets a remote signal — from an E-stop, fire alarm relay, or PLC output — open the breaker electrically without a person at the handle. No undervoltage release on this code; if UVR is required, that's a different suffix. The auxiliary switches are designated HQ type — that's Siemens' notation for early-make / late-break contacts used in signaling circuits. They mount on the left side of the breaker and are wired through the terminal cover. The shunt trip coil draws from the control voltage; verify polarity and voltage rating against the panel's control transformer before wiring. Maximum power loss is 12 W at rated load. That's moderate for a 20 A MCCB; in a dense panel with multiple breakers side-by-side, account for the cumulative heat in the enclosure sizing calculation.","metaTitle":"Siemens 3VA1120-5EF32-0HC0 SENTRON MCCB, 20A 3P, 187kA at 24","metaDescription":"Siemens SENTRON 3VA1120-5EF32-0HC0 molded case circuit breaker, 20A rated, 3-pole, 187kA breaking capacity at 240V AC. Current production. Quoted to order.","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","Maximum":"0 A","Minimum":"0 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]":"3 in","Height [In]":"5.12 in","Trip Indicator":"No","Number Of Poles":"3","Voltage Trigger":"Yes","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","Of The Supplied Basic Switch":"3VA11205EF320AA0","Design Of The Auxiliary Switch":"2 auxiliary switches HQ","Design Of The Auxiliary Release":"shunt trip (STL)","Ground-Fault Monitoring Version":"Without","Insulation Voltage / Rated Value":"800 V","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","Of The Integrated Auxiliary Trip Unit":"3VA9688-0BL30","Product Function / Grounding Protection":"No","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"500 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":"2","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AA12","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=37397&mlfb=3VA1120-5EF32-0HC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5EF32-0HC0/alternatives.json"},"ai":{"faq":[{"question":"Does this breaker include a shunt trip or undervoltage release?","answer":"It includes a shunt trip (STL) release for remote opening. No undervoltage release is fitted on this variant."},{"question":"What compliance documentation is available for this part?","answer":"As a current-production Siemens SENTRON MCCB, it carries CE, UL, and CSA certifications per the standard product line. RoHS and REACH declarations are available from Siemens documentation. Specific cert numbers are order-code dependent; verify against the exact variant for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-5EF32-0HC0","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/3VA1120-5EF32-0HC0 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}}