{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3344-4","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3344-4","canonicalUrl":"https://aoctrl.com/siemens/5SM3344-4","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3344-4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3344-4, 4-pole Type B RCCB, 40 A rated current, 30 mA residual sensitivity, short-time delayed, 400 V AC, 10 kA SCCR, DIN rail mount.","salesMarkdown":"## What this RCCB is and where it goes The Type B characteristic means it detects smooth DC fault currents up to 1 kHz, not just AC and pulsating DC — so it's the right choice for circuits with variable-speed drives, UPS systems, or PV inverters that can dump a flat DC residual onto the line. The short-time delayed design (SIGRES function) gives it selectivity against nuisance tripping from transient surge currents; it holds through the inrush of a motor starter or a capacitor bank without dropping the circuit. IP20 with connected conductors; install it inside a distribution board or enclosure. That's the load current it carries in normal operation — sized for a submain or a large final circuit feeding multiple loads. The short-time delayed variant (0.8 kA rated conditional short-circuit current per EN 60898 and IEC 61008-1) gives you selectivity with downstream 30 mA RCCBs — the downstream unit trips first on a fault, keeping the rest of the board live. DIN rail snap-on, any mounting position. Depth 77 mm, width 72 mm (4 MW), height 90 mm — installation depth 70 mm. Supply can enter from top or bottom; the SIGRES function stays active even with supply from below in the switched-off state. Silicon-free construction.","metaTitle":"Siemens 5SM3344-4 SENTRON RCCB, 4-pole, 40 A, 30 mA, Type B","metaDescription":"Siemens 5SM3344-4 SENTRON RCCB, 4-pole, 40 A, 30 mA, Type B, short-time delayed. 10 kA SCCR, DIN rail mount. Current lifecycle stage. Sourced to order against RFQ.","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":"-25 °C","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"DIN rail (REG)","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Product Designation":"RCCB","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Short-time delayed","Product Feature Silicon-Free":"Yes","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","according to EN 60898 rated value":"0.8 kA","according to IEC 61008-1 rated value":"0.8 kA","Switching Function Short-Term Delayed":"Yes","Value Range Of The Operating Frequency":"50/60 Hz","value range of the supply voltage at AC":"400 V","Value Range Of The Supply Voltage Frequency":"50 Hz","Supply Voltage For Testing Equipment Minimum":"195 V","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","for rated value of the current at AC in hot operating state per pole":"1.1 W"}},"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=77752&mlfb=5SM3344-4","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3344-4/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3344-4 and get a price?","answer":"The 5SM3344-4 is sourced to order against an RFQ through independent distribution. Submit a request for current pricing and availability; both are confirmed at quote time."},{"question":"What does the Type B characteristic mean on this RCCB?","answer":"Type B detects smooth DC residual currents up to 1 kHz, not just AC and pulsating DC. That makes it suitable for circuits with VFDs, UPS systems, or solar inverters that can produce a flat DC fault current — a standard Type A or AC RCCB would not see that fault."},{"question":"Will 5SM3344-4 drop into a panel specified around 5SY6613-8?","answer":"The 5SY6613-8 is a 4-pole miniature circuit breaker (MCB), not an RCCB — different function. Both share the same DIN rail footprint, 4 MW width, and 70 mm installation depth, so the mechanical fit is the same. But the 5SM3344-4 adds residual current protection; you would need to verify the upstream protective device coordination if swapping one for the other in a panel design."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3344-4","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/5SM3344-4 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}}