{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7120-7CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7120-7CC","canonicalUrl":"https://aoctrl.com/siemens/5SY7120-7CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7120-7CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7120-7CC, 1-pole miniature circuit breaker, 20 A, C-characteristic, 25 kA breaking capacity per IEC 60947-2, 400 V AC.","salesMarkdown":"The Siemens 5SY7120-7CC is a 1-pole SENTRON miniature circuit breaker rated 20 A with a C tripping characteristic. It breaks fault currents up to 25 kA per IEC 60947-2 at 400 V AC, which covers most industrial panel secondary distribution and motor branch-circuit protection needs. The 18 mm wide (1 width unit) body snaps onto standard DIN rail and sits 76 mm deep — a tight fit for shallow enclosures where every millimeter past 70 mm matters. The 25 kA breaking capacity at 400 V AC (IEC 60947-2) is the figure that governs fault-clearing ability in industrial mains distribution. Under UL 1077 and CSA C22.2 No. 235 the same breaker is rated 5 kA — a common derating for North American supplemental protection listings. Terminals accept solid or stranded copper from 0.75 to 35 mm², torqued to 2.5–3.5 N·m. That range covers everything from control-circuit tails to feeder-size conductors, so you don't need a separate reducer or ferrule adapter for mixed gauges in the same panel. Rated for ambient temperatures from -25 to +55 °C and storage down to -40 °C.","metaTitle":"Siemens 5SY7120-7CC SENTRON MCB, 20A C-Curve, 1P, 25kA IEC","metaDescription":"Siemens 5SY7120-7CC SENTRON miniature circuit breaker, 20A rated, C tripping characteristic, 1-pole, 25 kA breaking capacity per IEC 60947-2. Active production, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"18 mm","title":"5SY7120-7CC","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 230/400 V 15kA, 1-pole, C, 20A","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"1","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"1","Number of poles / Note":"1P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY7CC","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"20 A","Tripping characteristic class":"C","at DC / rated value / maximum":"72 V","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"25 kA","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8cccba1b4172ad134db5e7254b81b273.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=121737&mlfb=5SY7120-7CC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7120-7CC?","answer":"25 kA at 400 V AC per IEC 60947-2, and 5 kA per UL 1077 and CSA C22.2 No. 235. The IEC rating governs industrial panel fault clearing; the UL figure applies for supplemental protection in North American installations."},{"question":"Will 5SY7120-7CC drop into a panel specified around 5SY3132-6 without rewiring?","answer":"Both are 1-pole SENTRON MCBs on the same 18 mm DIN-rail footprint, so physical fit is identical. The difference is in ratings: 5SY7120-7CC is 20 A C-curve with 25 kA IEC breaking capacity, while 5SY3132-6 is a different current/curve variant. Terminal capacity (0.75–35 mm²) and torque (2.5–3.5 N·m) are the same, so no rewiring needed if the ampacity matches the circuit."},{"question":"What is the depth of 5SY7120-7CC?","answer":"76 mm overall depth, with an installation depth of 70 mm. That extra 6 mm accounts for the toggle handle projection beyond the DIN rail."},{"question":"What wire sizes does 5SY7120-7CC accept?","answer":"Solid or stranded copper from 0.75 mm² up to 35 mm². The screw terminals tighten to 2.5–3.5 N·m."},{"question":"Where can I buy 5SY7120-7CC?","answer":"Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7120-7CC","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/5SY7120-7CC when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}