{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1903-3DA00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1903-3DA00","canonicalUrl":"https://aoctrl.com/siemens/3RK1903-3DA00","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1903-3DA00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens Local Safety Modules PM-D FX1 failsafe power module, order code 3RK1903-3DA00, for MS Failsafe F-RS F-DS systems, 20.4–28.8 V DC, 30 mm width, 6 shutdown groups, SIL CL 3.","salesMarkdown":"The Siemens 3RK1903-3DA00 is a PM-D FX1 failsafe power module designed for the MS Failsafe F-RS and F-DS system family. It provides power distribution and overvoltage protection for up to six independent shutdown groups, with bus communication integrated on the module. The safe state is load circuit open — meaning when a safety demand occurs, the module opens its output contacts to remove power from the guarded zone. Rated for 20.4 to 28.8 V DC control supply, this module is sized for standard 24 V DC industrial safety circuits. It carries a SIL Claim Limit of 3 per EN 62061 and SIL CL 3 per IEC 61508, with a safe failure fraction of 99 % and average diagnostic coverage of 99 %. That puts it in Category 4 per EN ISO 13849-1 — the highest performance level for safety-related control systems, meaning it can handle single faults without losing the safety function and detects most dangerous failures automatically. The PFHD value of 6E-11 1/h (probability of dangerous failure per hour) is extremely low — three orders of magnitude below the SIL 3 threshold — so this module is well into the safety margin for high-demand or continuous-operation applications like press guarding, robot cell access, or conveyor hazard zones. The module measures 30 mm wide by 196.5 mm tall by 117.5 mm deep. Depth of 117.5 mm means it stays within the typical 120 mm enclosure clearance, so no need for a deeper gland plate or extended rear panel. The design is for safety circuits — it snaps onto the DIN rail via the base module and connects through the backplane bus, so no additional wiring for power distribution between modules. The 30 mm width leaves room alongside other safety I/O slices in the same row. ## Endurance and compliance Electrical endurance is rated at 200,000 operating cycles typical; mechanical service life at 10,000,000 cycles typical. Short circuit protection is built in. The module is Type B according to IEC 61508-2, meaning it uses complex components (microcontrollers, ASICs) and requires a higher diagnostic coverage than simple electromechanical safety relays. Hardware fault tolerance is HFT = 1, so the system can tolerate one fault without losing the safety function. Substance prohibitance date of 05/01/2012 aligns with RoHS compliance.","metaTitle":"Siemens 3RK1903-3DA00 PM-D FX1 Failsafe Power Module, SIL CL","metaDescription":"Siemens 3RK1903-3DA00 PM-D FX1 failsafe power module for MS Failsafe F-RS F-DS. SIL CL 3 per IEC 61508, Category 4 per EN ISO 13849-1, 99% SFF. 20.4-28.8 V DC, 30 mm wide, current","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Depth":"117.5 mm","Width":"30 mm","title":"3RK1903-3DA00","Height":"196.5 mm","Safe State":"Load circuit open","Rated Value":"20.4 ... 28.8 V","description":"PM-D FX1 Failsafe power module for MS Failsafe F-RS F-DS for 6 shutdown groups with overvoltage protection 30 mm can be plugged onto TM-PFX30S47-G1 -G0","lifecycle_stage":"current","Bus Communication":"Yes","Product Brand Name":"Local Safety Modules","Type Of Assignment":"2","Product Designation":"PM-D FX1","Design Of The Product":"for safety circuits","according to IEC 61508":"SIL CL 3","Short Circuit Protection":"Yes","Safe failure fraction (SFF)":"99 %","Substance Prohibitance (Date)":"05/01/2012","category according to EN ISO 13849-1":"4","average diagnostic coverage level (DCavg)":"99 %","safety device type according to IEC 61508-2":"Type B","Type Of Voltage Of The Control Supply Voltage":"DC","Electrical Endurance (Operating Cycles) Typical":"200 000","hardware fault tolerance according to IEC 61508":"1","PFHD with high demand rate according to EN 62061":"6E-11 1/h","SIL Claim Limit (subsystem) according to EN 62061":"3","Mechanical Service Life (Operating Cycles) Typical":"10 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$144.78","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2506c84bc50fd54eb200b0e325c9c833.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1564&mlfb=3RK1903-3DA00"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1903-3DA00","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/3RK1903-3DA00 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}}