{"product_id":"abb-spa-zc-21-spa-bus-connection-module","title":"ABB SPA-ZC 21 SPA Bus Connection Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp style=\"color: #2d3748; margin-bottom: 1rem;\"\u003e\nInterfacing substation secondary devices with optical communication loops, the \u003cstrong\u003eABB SPA-ZC 21\u003c\/strong\u003e functions as a high-integrity electrical-to-optical bus connection module. It plays a critical role in substation automation by converting electrical signals into optical pulses and vice versa, shielding data links against extreme electromagnetic fields and electrical line interference. The \u003cstrong\u003eSPA-ZC 21\u003c\/strong\u003e bus connection module provides direct conversion for TTL or RS 485 signal configurations, connecting protection relays and annunciator units to a centralized fiber-optic network infrastructure. Operating natively within the ABB SPACOM product family, this unit handles data transmission across diverse power system protection and distribution networks.\n\u003c\/p\u003e\n\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.2rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003e\n\u003cstrong\u003eHigh-Isolation Signal Conversion:\u003c\/strong\u003e Seamlessly transforms TTL or RS 485 level signals into light pulses for optical loop transmission.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003e\n\u003cstrong\u003eRobust Interference Immunity:\u003c\/strong\u003e Offers absolute defense against electromagnetic disturbances and high-voltage transients common in medium and high-voltage substations.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003e\n\u003cstrong\u003eDual-Mode Topology Compatibility:\u003c\/strong\u003e Supports dual-mode architecture, allowing field assignment in either master or slave serial communication setups.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003e\n\u003cstrong\u003eHost-Powered Efficiency:\u003c\/strong\u003e Draws operating power directly from the connected host secondary device, eliminating the need for independent external auxiliary power units.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003e\n\u003cstrong\u003eIntegrated Connector Interfaces:\u003c\/strong\u003e Equipped with a reliable 9-pin D-type subminiature terminal connection for the host device alongside a dedicated optical transceiver pair.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"list-style-type: square; color: #2d3748; padding-left: 1.2rem; margin-bottom: 1.5rem;\"\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003eConnecting standard secondary substation equipment and protection relays into fiber-optic SPA bus topologies.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003eInterfacing utility feeder distribution monitoring networks with centralized substation control levels.\u003c\/li\u003e\n  \u003cli style=\"margin-bottom: 0.25rem;\"\u003eHigh-noise industrial power environments requiring complete optical isolation between communication nodes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eType Designation\u003c\/th\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eTransmitter Type\u003c\/th\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eReceiver Type\u003c\/th\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eOrder Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21BB\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-AA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21BM\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-BA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21MB\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-CA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21MM\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-DA\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21BB\/S\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-AB\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21BM\/S\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-BB\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21MB\/S\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-CB\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eSPA-ZC 21MM\/S\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eGlass\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eRS 951 021-DB\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eParameter Category\u003c\/th\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eEngineered Specification Value\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eABB\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003ePart Number \/ Model\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eSPA-ZC 21\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eProduct Series\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eSPA Series (SPACOM Product Family)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003ePart Classification\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eOriginal New Part\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003ePower Supply Source\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePowered directly from host device via D-connector (no external auxiliary source required)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eElectrical Interfaces\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eTTL level or RS 485 level configuration options\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eOptical Interfaces\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003e1 pair of optical transceivers (Rx\/Tx)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eFibre Medium Options\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003ePlastic (980\/1000 micrometers) or Glass (50\/125 or 62.5\/125 micrometers) fiber cable\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eOperating Modes\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eMaster or Slave configurable configuration\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eCountry of Origin\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eFinland (FI)\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eConnections and Interfaces\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; width: 100%; margin-bottom: 1.5rem;\"\u003e\n  \u003ctable style=\"border-collapse: collapse; width: 100%; color: #2d3748;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"border-bottom: 2px solid #1a365d; text-align: left;\"\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eConnector Interface\u003c\/th\u003e\n        \u003cth style=\"padding: 0.5rem; font-weight: bold; color: #1a365d;\"\u003eFunction \/ Signal Mapping\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003e9-pin D-type Subminiature Connector\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eHost device electrical interface supporting TTL \/ RS 485 signals and internal power draw\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eOptical Rx Port\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eFibre-optic serial input receiver line for SPA bus signals\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"border-bottom: 1px solid #e2e8f0;\"\u003e\n        \u003ctd style=\"padding: 0.5rem; font-weight: bold;\"\u003eOptical Tx Port\u003c\/td\u003e\n        \u003ctd style=\"padding: 0.5rem;\"\u003eFibre-optic serial output transmitter line for SPA bus signals\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n  \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e1\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003eEnsure the host protection or annunciator device is powered down completely before securing the 9-pin D-type connector block to avoid erratic interface transitions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n  \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e2\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003eRoute fiber-optic cables with a generous bend radius to avoid micro-fractures in glass or plastic cores that cause attenuation loops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; align-items: flex-start; margin-bottom: 1rem;\"\u003e\n  \u003cdiv style=\"background-color: #2b6cb0; color: #ffffff; width: 24px; height: 24px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; margin-right: 0.75rem; flex-shrink: 0;\"\u003e3\u003c\/div\u003e\n  \u003cp style=\"color: #2d3748; margin: 0;\"\u003eClean optical connector tips with approved visual instrument solvents before final insertion into active Rx and Tx ports to guarantee signal continuity.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":52668584231275,"sku":"SPA-ZC21","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/abb-spa-zc21-bus-connection-module-wpjlm5o1vsv_d86cb9d6-5599-4d5f-9d5d-017cb5fd52d9.jpg?v=1765532990","url":"https:\/\/www.plcprotech.com\/products\/abb-spa-zc-21-spa-bus-connection-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}