{"product_id":"mjgx-3-d4840a-three-phase-solid-state-relay-40a-3-32vdc-led-indicator","title":"MJGX-3 Three Phase Solid State Relay 40A 3-32VDC LED Indicator","description":"\n\u003ch2\u003eMJGX-3 D4840A Three Phase Solid State Relay — Industrial-Grade Control with LED Indicator\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMJGX-3 D4840A Three Phase Solid State Relay\u003c\/strong\u003e is a robust, fully enclosed switching device engineered for demanding industrial automation environments. Rated at \u003cstrong\u003e40A load current\u003c\/strong\u003e with a \u003cstrong\u003e3–32VDC control input\u003c\/strong\u003e and \u003cstrong\u003e90–480VAC output\u003c\/strong\u003e, this SSR delivers silent, fast, and reliable switching — with zero mechanical wear. A built-in \u003cstrong\u003eLED indicator\u003c\/strong\u003e gives instant visual confirmation of the relay's on\/off state, simplifying monitoring and diagnostics on the factory floor. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFully Enclosed Structure:\u003c\/strong\u003e Engineered to resist shock, moisture, and corrosion for long-lasting industrial performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSuperior Contact Quality:\u003c\/strong\u003e Rust-resistant, durable connections ensure consistent and dependable switching operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAnti-Oxidation Heat-Dissipation Base Plate:\u003c\/strong\u003e Specially plated cooling base with a fine finish promotes efficient thermal management, preventing overheating during sustained use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlame-Retardant Protective Shell:\u003c\/strong\u003e High-temperature-resistant housing provides fire, dust, and vibration-loosening protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Status Indicator:\u003c\/strong\u003e Built-in LED provides at-a-glance confirmation of relay activation — no guesswork needed.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Industrial Compatibility:\u003c\/strong\u003e Ideal for petrochemical equipment, pharmaceutical and food machinery, packaging systems, textile machinery, plastic processing, CNC machine tools, and broader automation control applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBolt-Fixation Mounting:\u003c\/strong\u003e Secure and straightforward installation on DIN rails, panels, or heat sinks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMJGX-3 D4840A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePhases\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eThree Phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e90–480VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl (Input) Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3–32VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15–30mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOn-State Voltage Drop\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤1.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOff-State Leakage Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤10mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOff-State Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤10ms\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDielectric Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2500VAC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInsulation Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1000MΩ \/ 500VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAmbient Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-30°C to +75°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBolt Fixation\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStatus Indicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLED\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e340g\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× MJGX-3 D4840A Three Phase Solid State Relay\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDue to lighting and screen variation, the product color may differ slightly from images shown.\u003c\/li\u003e\n  \u003cli\u003ePlease allow ±1–3cm tolerance due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eFor safe installation and operation of solid state relays, always follow applicable electrical codes and standards. Refer to \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety Guidelines\u003c\/a\u003e for best practices when working with industrial switching devices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is a three phase solid state relay and how does the MJGX-3 D4840A work?\u003c\/h4\u003e\n\u003cp\u003eA: A three phase solid state relay (SSR) is an electronic switching device that controls three-phase AC loads using a low-voltage DC control signal — with no moving mechanical parts. The MJGX-3 D4840A accepts a 3–32VDC input signal and switches a 90–480VAC, up to 40A load. Because switching is handled by semiconductor components (rather than mechanical contacts), SSRs offer faster response times, silent operation, and significantly longer service life compared to traditional electromechanical relays.\u003c\/p\u003e\n\u003ch4\u003eQ: Do I need an external heat sink for the MJGX-3 D4840A solid state relay?\u003c\/h4\u003e\n\u003cp\u003eA: While the MJGX-3 D4840A features a built-in anti-oxidation cooling base plate designed for heat dissipation, operating the relay at or near its maximum 40A load rating will generate significant heat. For continuous high-current applications, mounting the relay on an appropriately rated external aluminum heat sink is strongly recommended to maintain optimal performance and extend the lifespan of the unit.\u003c\/p\u003e\n\u003ch4\u003eQ: What types of industrial equipment is this three phase SSR compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: The MJGX-3 D4840A is widely used in a broad range of industrial automation applications, including petrochemical equipment, pharmaceutical and food processing machinery, packaging lines, textile machinery, plastic extrusion machinery, and CNC machine tools. Any three-phase AC load requiring a low-voltage DC control interface within the relay's rated specifications can benefit from this SSR.\u003c\/p\u003e\n\u003ch4\u003eQ: What does the LED indicator on the MJGX-3 D4840A indicate?\u003c\/h4\u003e\n\u003cp\u003eA: The built-in LED indicator illuminates when the relay is in the \"on\" (conducting) state, providing a quick and clear visual confirmation that the control signal has been received and that the output circuit is active. This makes troubleshooting and system monitoring significantly easier, especially in complex control panel environments.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a three phase solid state relay and how does the MJGX-3 D4840A work?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A three phase solid state relay (SSR) is an electronic switching device that controls three-phase AC loads using a low-voltage DC control signal — with no moving mechanical parts. The MJGX-3 D4840A accepts a 3–32VDC input signal and switches a 90–480VAC, up to 40A load. Because switching is handled by semiconductor components (rather than mechanical contacts), SSRs offer faster response times, silent operation, and significantly longer service life compared to traditional electromechanical relays.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need an external heat sink for the MJGX-3 D4840A solid state relay?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"While the MJGX-3 D4840A features a built-in anti-oxidation cooling base plate designed for heat dissipation, operating the relay at or near its maximum 40A load rating will generate significant heat. For continuous high-current applications, mounting the relay on an appropriately rated external aluminum heat sink is strongly recommended to maintain optimal performance and extend the lifespan of the unit.\"}}, {\"@type\": \"Question\", \"name\": \"What types of industrial equipment is this three phase SSR compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The MJGX-3 D4840A is widely used in a broad range of industrial automation applications, including petrochemical equipment, pharmaceutical and food processing machinery, packaging lines, textile machinery, plastic extrusion machinery, and CNC machine tools. Any three-phase AC load requiring a low-voltage DC control interface within the relay's rated specifications can benefit from this SSR.\"}}, {\"@type\": \"Question\", \"name\": \"What does the LED indicator on the MJGX-3 D4840A indicate?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The built-in LED indicator illuminates when the relay is in the \\\"on\\\" (conducting) state, providing a quick and clear visual confirmation that the control signal has been received and that the output circuit is active. 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