{"product_id":"alstom-mvaj105ra0802a-protection-relay-module","title":"MVAJ105RA0802A ALSTOM Hinged Armature Trip Relay","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eMVAJ105RA0802A (MVAJ105RA0802A)\u003c\/strong\u003e is a high-speed, hinged armature tripping relay belonging to the renowned MVAJ product range. This module acts as the critical interface between primary protective relays and circuit breaker trip coils in high-voltage substations and industrial power networks. Designed for absolute reliability, the MVAJ105RA0802A ensures that trip commands are executed with sub-millisecond precision and minimal contact bounce. By providing a rugged and flexible link in the protection chain, this relay prevents equipment damage and enhances the safety of power distribution systems under fault conditions.\u003c\/p\u003e\n\u003ch3\u003eTechnical Configuration (Deep Dive)\u003c\/h3\u003e\n\u003cp\u003eThe MVAJ range is engineered to accommodate a variety of complex tripping schemes through its versatile armature design and burden-selection capabilities.\u003c\/p\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh-Speed Operation:\u003c\/strong\u003e Utilizes a lightweight, high-performance hinged armature that ensures rapid contact closure, vital for minimizing the duration of electrical faults.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSelectable Burden:\u003c\/strong\u003e Features an external link connection that allows engineers to select between high and low burdens. The high-burden configuration provides superior immunity to wiring capacitance discharge, preventing nuisance tripping in extensive cabling networks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eReset Logic:\u003c\/strong\u003e The RA0802A variant is typically configured with hand or electrical reset mechanisms (depending on internal wiring), providing clear visual indication of a trip event via a mechanical flag.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eImmunity \u0026amp; Security:\u003c\/strong\u003e Built with internal filtering to ensure immunity to AC\/DC interference and capacitive discharge from long pilot wires, making it ideal for large-scale utility grids.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eAttribute\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMVAJ105RA0802A\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eALSTOM (GE Protection \u0026amp; Control)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA \/ UK\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eRelay Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHinged Armature Tripping Relay\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eReset Type\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHand \/ Electrical Reset (RA Series)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eBurden Selection\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHigh or Low (External Link)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eOperating Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-10 to 55 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eStorage Temp\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-25 to 70 deg C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e22 x 182 x 127 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.14 kg\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eTechnical FAQs\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ1: How does the MVAJ105RA0802A prevent accidental tripping from stray signals?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA1:\u003c\/strong\u003e The relay can be configured in a high-burden mode, which requires a higher energy threshold to operate. This effectively filters out noise and capacitive discharges common in long-distance control wiring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2: What is the significance of the \"RA\" code in the model number?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA2:\u003c\/strong\u003e The \"RA\" designation refers to the specific contact arrangement and reset logic. In this series, it signifies a relay designed for multi-contact tripping with specific reset capabilities for fault signaling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3: Does the mechanical flag require manual intervention after a fault?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA3:\u003c\/strong\u003e Yes, for hand-reset models, the mechanical flag must be manually reset by an operator after the fault is cleared to acknowledge the trip event and restore the relay to its ready state.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eEngineering \u0026amp; Installation Guide\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eContact Burden Setting:\u003c\/strong\u003e During commissioning, verify the external link position. Use the \"High Burden\" setting if the relay is located at a significant distance from the protective device to negate the effects of cable capacitance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eMounting Orientation:\u003c\/strong\u003e The MVAJ105RA0802A must be mounted vertically on a vibration-free panel. Any significant tilt can affect the gravitational balance of the hinged armature, potentially altering the operating speed or sensitivity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eTripping Coil Compatibility:\u003c\/strong\u003e Ensure the breaker trip coil's current requirements do not exceed the relay’s contact rating. For multiple trip coils, verify that the parallel current remains within the 10 A (short-term) thermal limit of the relay contacts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEngineering Advantages\u003c\/h3\u003e\n\u003cp\u003eThe ALSTOM MVAJ105RA0802A is celebrated for its \"set and forget\" reliability. With its minimal contact bounce and high-speed response, it protects circuit breaker coils from prolonged energization. The module's design is compliant with the highest international protection standards, ensuring that it remains operational even after years of inactivity in a substation cabinet. Its compact footprint allows for high-density installation, enabling complex multi-contact tripping schemes to be housed in standard protection racks without excessive space requirements.\u003c\/p\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003c\/h3\u003e","brand":"Alstom","offers":[{"title":"Default Title","offer_id":52695207346539,"sku":"MVAJ105RA0802A","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/alstom-mvaj105ra0802a-protection-relay-module-ef025d01hzj_6b3326d9-0c93-4b2a-ac44-6b1f309f5029.jpg?v=1766130731","url":"https:\/\/www.plcprotech.com\/products\/alstom-mvaj105ra0802a-protection-relay-module","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}