{"product_id":"siemens-c73040-a27-c246-03-communication-module","title":"Siemens C73040-A27-C246-03 Communication Module","description":"\u003cp\u003eThe \u003cstrong\u003eSiemens C73040-A27-C246-03\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eC73040-A27-C246-03\u003c\/strong\u003e Communication Module, operates as a dedicated hardware component for RS-485 serial data transmission within SIPROTEC protection relay platforms. It establishes point-to-point or multi-drop serial interconnections between discrete bay protection devices and localized substation automation hubs. \u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eC73040-A27-C246-03\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eGermany\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.4 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e73.5 mm x 373 mm x 142 mm (W x H x D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e-25 deg C to +60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e24 VDC nominal logical supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Protocol Layout\u003c\/td\u003e\n\u003ctd\u003eRS-485 Serial (Modbus RTU \/ IEC 60870-5-103)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Family\u003c\/td\u003e\n\u003ctd\u003eSIPROTEC Protection Accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Application\u003c\/td\u003e\n\u003ctd\u003eIntegrated subrack option slot mounting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCommodity Code\u003c\/td\u003e\n\u003ctd\u003e85389091\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: What actions occur on the RS-485 transmission lines if the host relay drops logic power?\u003c\/p\u003e\n\u003cp\u003eA: The module relies on passive bias networks and isolation barriers tied to the subrack power line. If logical power drops, the internal transceiver tristates its differential lines, preventing electrical shorting of the shared serial network trunk and allowing adjacent nodes to maintain active communication profiles.\u003c\/p\u003e\n\u003cp\u003eQ: How is the exact communication protocol configured on this interface card?\u003c\/p\u003e\n\u003cp\u003eA: The hardware serves as the physical layer (RS-485 transceiver). Protocol structures such as Modbus RTU, Profibus, or IEC 60870-5-103 are configured inside the host SIPROTEC relay parameterization software, flashing the matching firmware mapping directly into the subrack system memory registers.\u003c\/p\u003e","brand":"SIEMENS","offers":[{"title":"Default Title","offer_id":45050120077427,"sku":"C73040-A27-C246-03","price":410.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0644\/4348\/2227\/files\/screenshot_2026-05-27_14-40-43_c2c3f81f-c67d-4aae-946e-2fa7468f2aa6.png?v=1779866480","url":"https:\/\/www.dcssupplier.com\/products\/siemens-c73040-a27-c246-03-communication-module","provider":"DcsSupplier Limited","version":"1.0","type":"link"}