{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP4437-8XB00-0CY0","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP4437-8XB00-0CY0","canonicalUrl":"https://aoctrl.com/siemens/6EP4437-8XB00-0CY0","factsUrl":"https://aoctrl.com/api/mcp/products/6EP4437-8XB00-0CY0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP CNX8600 expansion module, 6EP4437-8XB00-0CY0, 40 A rated, 4 outputs, 97% efficiency, DIN-rail mount.","salesMarkdown":"The 6EP4437-8XB00-0CY0: The 40 A rated current is the total system limit — no single output can exceed 10 A, and the sum across all four outputs must stay at or below 40 A. The 97% efficiency means only 3% of input power is lost as heat, which keeps the enclosure cool and reduces derating needs in a crowded panel. The IP20 protection means it is safe for dry indoor cabinets but not washdown environments. The module snaps onto a DIN rail EN 60735 35x15. The enclosure is 60 mm wide and 150 mm deep. Clearance requirements: 50 mm top and bottom, 0 mm left and right. That zero side clearance means modules can be ganged directly without gaps — useful for dense panel layouts. ## Output wiring and overcurrent behavior Each output uses two plug-in terminals with two screw connections each, accepting 0.2–2.5 mm² wire. The ground terminal is a separate plug-in with three screw connections. Overcurrent response: Ia >1.0 to <1.5 × Ia threshold is permissible for 5 s; Ia at 1.5 × Ia threshold is permissible for 200 ms. That gives the downstream breaker time to clear a fault without nuisance tripping the module. ## Environmental and approvals MTBF at 40 °C is 358,372 hours. Approvals: CE marking, cULus-Listed to UL 508 and CSA C22.2 No. 107.1, EAC, and shipbuilding approvals from ABS and DNV GL. The module is not ATEX or IECEx rated, so it is not suitable for explosive atmospheres.","metaTitle":"Siemens 6EP4437-8XB00-0CY0 SITOP CNX8600 Expansion Module, 4","metaDescription":"Siemens 6EP4437-8XB00-0CY0 SITOP CNX8600 expansion module, 40 A rated, 4 outputs, 97% efficiency. UL/CSA listed, shipbuilding approved. Current production. Submit RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["DIN Rail Power Supplies"],"specifications":{"Top":"50 mm","ATEX":"No","Left":"0 mm","IECEx":"No","Right":"0 mm","title":"6EP4437-8XB00-0CY0","Bottom":"50 mm","C-Tick":"No","DNV GL":"Yes","Maximum":"10 ms","At Output":"1, 2, 3, 4: Two plug-in terminals (1, 2 and 3, 4) with 2 screwed connections each for 0.2 ... 2.5 mm²; Ground: Plug-in terminal with 3 screwed connections for 0.2 ... 2.5 mm²","CE marking":"Yes","Per Output":"10 A","NEC Class 2":"No","Rated Range":"0 ... 40 A; No increase in the maximum output power of the overall system SITOP PSU8600 via the expansion module SITOP CNX8600 possible","Rated Value":"40 A","UL approval":"Yes; cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; cCSAus (CSA C22.2 No. 60950-1, UL 60950-1)","description":"SITOP CNX8600 4x10 A expansion module for PSU8600 output: 24 V DC/4x 10 A *Ex approval no longer available*","CSA approval":"Yes; cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; cCSAus (CSA C22.2 No. 60950-1, UL 60950-1)","EAC approval":"Yes","During Storage":"-40 ... +85 °C","MTBF at 40 °C":"358 372 h","FM registration":"No","lifecycle_stage":"current","During Operation":"-25 ... +60 °C; with natural convection","During Transport":"-40 ... +85 °C","Fastening Method":"Snaps onto DIN rail EN 60715 35x15","Number Of Outputs":"4","Other Information":"Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)","ULhazloc approval":"No","Galvanic Isolation":"Safety extra-low output voltage Uout acc. to EN 60950-1 and EN 50178","protection class IP":"IP20","Bridging Of Equipment":"No","Efficiency In Percent":"97 %","Of The Excess Current":"Ia >1.0…<1.5 x Ia threshold permissible for 5 s; Ia limit (= 1.5 x Ia threshold) permissible for 200 ms","Remote Reset Function":"Non-electrically isolated 24 V input (signal level \"high\" at > 15 V) at power supply unit PSU8600","Shipbuilding Approval":"ABS, DNV GL","Depth Of The Enclosure":"150 mm","Mechanical Accessories":"Device identification label 20 mm × 7 mm, TI-grey 3RT2900-1SB20","Response Delay Maximum":"1.5 s; Without on-delay of the outputs","Width Of The Enclosure":"60 mm","At Output 1 Rated Value":"10 A","At Output 2 Rated Value":"10 A","At Output 3 Rated Value":"10 A","At Output 4 Rated Value":"10 A","Design Of The Interface":"Ethernet/PROFINET via power supply unit PSU8600","Height Of The Enclosure":"125 mm","Voltage Curve At Output":"Controlled, isolated DC voltage","For Emitted Interference":"EN 55022 Class B","Nippon Kaiji Kyokai (NK)":"No","Type Of Signal At Output":"Relay contact (changeover contact, contact current capacity DC 60 V/0.3 A) for \"Operating state OK\" at power supply unit PSU8600","Adjustable Output Voltage":"4 ... 28 V","For Interference Immunity":"EN 61000-6-2","Type Of Outputs Connection":"Simultaneous connecting-in of all outputs after device booting or delay time of 25 ms, 100 ms or \"load-optimized\" for sequential cutting-in of the outputs via DIP switches at power supply unit PSU8600 can be set","cCSAus, Class 1, Division 2":"No","Removable Terminal At Output":"Yes","Parallel Switching Of Outputs":"No","Supplied Active Power Typical":"960 W","Type Of Electrical Connection":"Plug-in terminals with screwed connection","at output 1 at DC rated value":"24 V","at output 2 at DC rated value":"24 V","at output 3 at DC rated value":"24 V","at output 4 at DC rated value":"24 V","Type Of Output Voltage Setting":"via potentiometer or IE/PN interface; Derating > 24 V: 4%/V; max. 240 W per output","Type Of Response Value Setting":"via potentiometer or IE/PN interface","output voltage at DC rated value":"24 V","Lloyds Register of Shipping (LRS)":"No","Design Of Short-Circuit Protection":"electronic overload cut-off","On Slow Fluctuation Of Ohm Loading":"0.1 %","Operating Resource Protection Class":"Class III","Design Of The Overvoltage Protection":"max. 35 V (max. 500 ms)","Display Version For Normal Operation":"3-color LED for operating state module; 3-color LED per output for operating state output","On Slow Fluctuation Of Input Voltage":"0.2 %","Type Of Connection To System Components":"Via integrated connector","French marine classification society (BV)":"No","Relative Overall Tolerance Of The Voltage":"3 %","Product Function Output Voltage Adjustable":"Yes","Property Of The Output Short-Circuit Proof":"Yes","Suitability For Interaction Modular System":"Yes","Galvanic Isolation Between Input And Output":"Yes","American Bureau of Shipping Europe Ltd. (ABS)":"Yes","environmental category according to IEC 60721":"Climate class 3K3, 5 … 95% no condensation","Design Of The Reset Device/Resetting Mechanism":"via sensor per output or IE/PN interface","Display Version For Overload And Short Circuit":"3-color LED for operating state module; 3-color LED per output for operating state output","Behavior Of The Output Voltage When Switching On":"No overshoot of Vout (soft start)","Product Feature Of The Enclosure Housing Can Be Lined Up":"Yes","At Rated Output Voltage For Rated Value Of The Output Current Typical":"30 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.5 ... 10 A","Relative Control Precision Of The Output Voltage With Rapid Fluctuation Of The Input Voltage By +/- 15% Typical":"0.1 %"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$186.69 – $258.76","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/860d76d3da612063563453a22345931e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=254799&mlfb=6EP4437-8XB00-0CY0"},"ai":{"faq":[{"question":"What are the key ratings of this expansion module?","answer":"Rated current 40 A total, four outputs each rated 10 A, efficiency 97%, operating temperature -25 to +60 °C, MTBF 358,372 hours at 40 °C."},{"question":"What approvals does the 6EP4437-8XB00-0CY0 carry?","answer":"CE marking, cULus-Listed (UL 508, CSA C22.2 No. 107.1), EAC, and shipbuilding approvals from ABS and DNV GL."},{"question":"What clearance is needed around the module?","answer":"50 mm top and bottom, 0 mm left and right. Side ganging is allowed without gaps."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP4437-8XB00-0CY0","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/6EP4437-8XB00-0CY0 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}}