{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1120-5EF32-0CH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1120-5EF32-0CH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1120-5EF32-0CH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5EF32-0CH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1120-5EF32-0CH0, molded case circuit breaker, 3-pole, 20 A rated continuous current, TM240 release, 187 kA interrupting at 240 V, undervoltage release, 2 aux + 1 alarm switch, IP40 front.","salesMarkdown":"## What you're looking at The 3VA1120-5EF32-0CH0: This breaker is built for high-fault environments. At 240 V it interrupts 187 kA, at 415 V it handles 121 kA, at 440 V it's rated 75.6 kA, and at 690 V it still takes 17 kA. That's a serious interrupting capacity for a 20 A frame — it's meant for large transformer secondaries, main feeders, or high-fault panelboards where a standard MCCB would weld its contacts. Mount it inside a panel or enclosure — this isn't a weatherproof standalone device. Above that, it starts to derate: 19.2 A at 55 °C, 18.8 A at 60 °C, 18.4 A at 65 °C, and 18 A at 70 °C. Mechanical endurance is listed at 15,000 cycles. That's the latching endurance — the number of times you can open and close the breaker under no-load before wear affects the mechanism. For a main breaker that cycles once a day, that's about 41 years. For a motor-disconnect that cycles hourly, it's about 2 years. Plan accordingly. ## Auxiliaries and releases This MCCB comes equipped with an undervoltage release (UVR) — if the supply voltage drops below the release threshold, the breaker trips. That's useful for preventing automatic restart after a brownout or for coordinated shutdown in a safety circuit. That gives you two sets of normally open/normally closed contacts for status feedback — say, one for the PLC input and one for a panel indicator — plus a separate alarm contact that changes state only when the breaker trips on fault, not when manually opened. The integrated auxiliary trip module is order code 3VA9608-0BB24, if you need a replacement or spare. There is no voltage trigger, no communication function, no phase failure detection, and no ground fault monitoring on this variant. It's a straight thermal-magnetic line-protection breaker with undervoltage release. If you need ground fault or phase loss protection, you're looking at a different 3VA variant. ## Physical fit The width of 76.2 mm is roughly 3 inches, so plan your gutter space and wire bending radius accordingly. The trip indicator is present — a mechanical flag on the front shows whether the breaker has tripped on overload or short circuit. Helpful for troubleshooting a line-down situation without needing a meter first. If you're comparing this to the 3VA1112-5EF32-0CA0 (a 12 A variant) or the 3VA1110-5EE32-0JA0 (a 10 A with different aux config), the physical footprint is the same — same 3-pole frame, same mounting pattern. The difference is the trip unit rating and the auxiliary contact count. This 20 A version with 2 aux + 1 alarm is the one you want for a 20 A feeder with status feedback.","metaTitle":"Siemens 3VA1120-5EF32-0CH0 SENTRON MCCB, 20 A, 3-pole, 187 k","metaDescription":"Siemens 3VA1120-5EF32-0CH0 SENTRON molded case circuit breaker, 20 A rated continuous current, 3-pole, 187 kA at 240 V. Current production. Available to order via RFQ.","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":"187 kA","at 415 V":"121 kA","at 440 V":"75.6 kA","at 690 V":"17 kA","at 40 °C":"20 A","at 45 °C":"20 A","at 50 °C":"20 A","at 55 °C":"19.2 A","at 60 °C":"18.8 A","at 65 °C":"18.4 A","at 70 °C":"18 A","Trip indicator":"Yes","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 + 1 trip alarm switch HQ","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Other Measurement Function":"No","Rated continuous current Iu":"20 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":"3VA9608-0BB24","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.":"20 A","Adjustable response value current / li max.":"320 A","Adjustable response value current / li min.":"160 A","Adjustable response value current / lr min.":"14 A","Neutral conductors / upgradeable/retrofittable":"No","Number of CO contacts / for auxiliary contacts":"3","Protective function of the overcurrent release":"LI","Of The Integrated Auxiliary Switch/Alarm Switch":"3VA9988-0AB12","Switching capacity class of the circuit breaker":"M","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=78020&mlfb=3VA1120-5EF32-0CH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1120-5EF32-0CH0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3VA1120-5EF32-0CH0 and get a price?","answer":"This MCCB 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":"Will the 3VA1120-5EF32-0CH0 drop into a panel specified for the 3VA1112-5EF32-0CA0?","answer":"Yes. Both are 3-pole SENTRON 3VA breakers with the same frame size and mounting pattern. The only difference is the continuous current rating: 20 A on this unit versus 12 A on the 3VA1112-5EF32-0CA0. No rewiring needed if the bus and conductors are sized for 20 A."},{"question":"What is the depth of the 3VA1120-5EF32-0CH0?","answer":"The depth is 70 mm. Combined with a width of 76.2 mm and height of 130 mm, it fits a standard 3-pole MCCB footprint for this current range."},{"question":"What compliance documentation does Siemens provide for this MCCB?","answer":"As a SENTRON 3VA product, this breaker carries the standard IEC/EN 60947-2 certifications for molded case circuit breakers. Siemens provides a declaration of conformity and the product is designed to meet RoHS and REACH requirements. Specific documentation is available with the order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1120-5EF32-0CH0","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/3VA1120-5EF32-0CH0 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}}