{"product_id":"abb-rex521ghhpsh07g-protection-and-control-relay","title":"ABB REX521GHHPSH07G Protection and Control Relay","description":"\u003ch3\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eREX521GHHPSH07G\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a compact protection and control relay from the ABB REX500 family, engineered for dependable supervision and control of electrical systems in industrial and utility environments. As part of the long-established REX521 series, it integrates protection, measurement, logic control, and communication functions into a single robust unit, suitable for continuous operation in electrically demanding installations.\u003c\/p\u003e\n\u003cp\u003eDeveloped by\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eABB\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e, this relay reflects proven Nordic design practices with a strong focus on operational reliability, deterministic behavior, and long service life.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eREX521GHHPSH07G\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis designed as a multifunction protection relay rather than a general-purpose PLC. Specifications below reflect typical REX521 platform characteristics and correct common misinterpretations found in non-technical descriptions.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eProduct Series: ABB REX521 (REX500 family)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDevice Type: Protection and Control Relay\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOrder Code:\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eREX521GHHPSH07G\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCountry of Manufacture: Finland\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePower Supply: 24 V DC (industrial auxiliary supply)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProcessing Platform: Dedicated real-time protection processor (DSP-based architecture)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProtection Functions: Overcurrent, earth fault, supervision and logic-based protection (configuration-dependent)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eControl Functions: Binary control, interlocking logic, event handling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInputs: Analog current\/voltage inputs, digital status inputs\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOutputs: Relay outputs for trip, alarm, and control signaling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCommunication Interfaces:\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eABB SPA bus\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIEC 60870-5-103 (optional configuration)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSerial service interface for parameterization and diagnostics\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\n\u003cp\u003eConfiguration Method: PC-based engineering tools via service port\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEnvironmental Protection: Industrial enclosure for control cabinet installation (not field IP-rated)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOperating Temperature Range: –20 °C to +60 °C\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMounting: Panel or rack mounting within protected enclosures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWeight: 5 kg\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Functional Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eREX521GHHPSH07G\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eemphasizes deterministic protection behavior rather than high-level computing performance. Its design focuses on stable signal acquisition, fast protection response, and predictable control logic execution. The relay supports flexible parameterization, enabling adaptation to different network topologies and protection philosophies without hardware modification.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTypical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThis relay is commonly deployed in medium-voltage and auxiliary power systems where integrated protection and control are required, including:\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial power distribution panels\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGenerator and motor protection schemes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSubstation auxiliary systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProcess industry electrical protection cabinets\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs the REX521GHHPSH07G a PLC or a safety controller?\u003c\/strong\u003e\u003cbr\u003eNo. The REX521 is a dedicated protection and control relay. While it includes logic and control capabilities, it is not intended to replace PLCs or certified safety controllers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this model support modern Ethernet-based protocols?\u003c\/strong\u003e\u003cbr\u003eThe REX521 platform primarily supports serial and ABB-specific communication protocols. Ethernet-based fieldbus support is not native to this generation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used as a direct replacement for newer ABB protection relays?\u003c\/strong\u003e\u003cbr\u003eFunctionally similar roles may exist, but newer relay families differ in hardware architecture, communication options, and configuration tools. Application-level compatibility should be evaluated case by case.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":42985750069338,"sku":"REX521GHHPSH07G","price":258.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0612\/4601\/3530\/files\/REX521GHHPSH07G2.jpg?v=1772262345","url":"https:\/\/www.plcmasters.com\/products\/abb-rex521ghhpsh07g-protection-and-control-relay","provider":"PLC Masters Ltd.","version":"1.0","type":"link"}