{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3442-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3442-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3442-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3442-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 2-pole, type AC, In: 25 A, 100 mA, Un AC: 400 V, 10 kA SCCR, DIN rail mount, IP20.","salesMarkdown":"The Siemens 5SM3442-0 is a 2-pole, type AC residual current operated circuit breaker (RCCB) from the SENTRON family, rated 25 A at 400 V AC with a 100 mA trip threshold. It snaps onto a DIN rail (REG) and occupies 4 width units (72 mm) in the panel — a standard footprint for a 2-pole block in a distribution board. The 100 mA residual tripping current is the key selection parameter: it is sized for equipment protection (fire prevention) rather than personnel shock protection, which typically calls for 30 mA or lower. On a 25 A circuit feeding a pump, compressor, or lighting distribution board, the 100 mA threshold provides ground-fault detection without nuisance tripping from normal leakage on long cable runs or motor windings. The 10 kA short-circuit current rating (SCCR) per EN 60898 and IEC 61008-1 means the device can safely interrupt a fault up to 10 kA at 400 V — adequate for most commercial and light industrial distribution boards where the prospective fault current stays under that level. Overvoltage category III confirms it is rated for fixed-installation use downstream of the main incoming supply. Depth is 77 mm, installation depth 70 mm — verify enclosure depth if retrofitting into a shallow panel. The top or bottom power supply cord position gives flexibility in busbar routing. Finger and back-of-hand safe touch protection is built in. Silicon-free construction is noted for applications where outgassing must be avoided (e.g., adjacent to sensitive electronics or in clean-room adjacent zones).","metaTitle":"Siemens 5SM3442-0 SENTRON RCCB, 2-pole, 25 A, 100 mA, 400 V","metaDescription":"Siemens SENTRON 5SM3442-0 RCCB, 2-pole, type AC, 25 A rated, 100 mA trip, 400 V, 10 kA SCCR. Current production. Sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-5 °C","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","Number of poles":"2","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Operating frequency":"50 Hz","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Design of the product":"Instantaneous","Number of width units":"4","Type of fault current":"AC","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Short-circuit current rating":"10 kA","Product feature / silicon-free":"Yes","acc. to EN 60898 / rated value":"0.8 kA","For Testing Equipment / Minimum":"100 V","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","according to IEC 61008-1 / rated value":"0.8 kA","Operating current / at AC / rated value":"25 A","Switching function / short-term delayed":"No","Tripping residual current / rated value":"100 mA","Size of installation devices / acc. to DIN 43880":"1","Mechanical service life (switching cycles) / typical":"10 000"}},"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=523741&mlfb=5SM3442-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3442-0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 5SM3442-0?","answer":"It is a 2-pole, type AC RCCB rated 25 A at 400 V AC with a 100 mA residual trip threshold and a 10 kA short-circuit current rating per EN 60898."},{"question":"Where can I buy the 5SM3442-0?","answer":"This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will the 5SM3442-0 drop into a panel specified around the 5SY6613-8 without rewiring?","answer":"The 5SM3442-0 is an RCCB (residual current device), while the 5SY6613-8 is a miniature circuit breaker (MCB). They serve different protection functions and are not direct drop-in replacements. The physical dimensions are similar (both 72 mm wide, 90 mm tall, similar depth), but the wiring and circuit protection scheme would need to be re-evaluated."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3442-0","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/5SM3442-0 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}}