{"id":2288,"date":"2025-12-23T09:12:43","date_gmt":"2025-12-23T01:12:43","guid":{"rendered":"https:\/\/www.britecelectric.com\/?post_type=blog&p=2288"},"modified":"2025-12-18T14:30:27","modified_gmt":"2025-12-18T06:30:27","slug":"what-is-dc-surge-protection-devicewhat-is-a-24v-dc-power-supply","status":"publish","type":"blog","link":"https:\/\/www.britecelectric.com\/fr\/blog\/what-is-dc-surge-protection-device-what-is-a-24v-dc-power-supply\/","title":{"rendered":"Qu'est-ce qu'un dispositif de protection contre les surtensions CC ? Qu'est-ce qu'une alimentation 24 V CC ?"},"content":{"rendered":"Dispositifs de protection contre les surtensions CC<\/a> (DC SPD) et les alimentations 24 V CC sont des composants cl\u00e9s qui forment ensemble une ligne de d\u00e9fense contre les surtensions transitoires et assurent la continuit\u00e9 du syst\u00e8me. Comprendre leurs principes de fonctionnement, leurs crit\u00e8res de s\u00e9lection et leurs effets synergiques est crucial pour concevoir et maintenir des syst\u00e8mes \u00e9lectriques s\u00fbrs et efficaces.\r\n

Qu'est-ce qu'un dispositif de protection contre les surtensions CC\u00a0?<\/h2>\r\n

D\u00e9finitions<\/h3>\r\nLes dispositifs de protection contre les surtensions CC sont des dispositifs de protection contre la foudre et les surtensions sp\u00e9cialement con\u00e7us pour les circuits CC. Ils peuvent r\u00e9agir en quelques nanosecondes, d\u00e9chargeant en toute s\u00e9curit\u00e9 les surtensions transitoires (surtensions) provoqu\u00e9es par l'induction de la foudre, les op\u00e9rations de commutation ou les d\u00e9charges \u00e9lectrostatiques au sol, prot\u00e9geant ainsi les \u00e9quipements \u00e9lectroniques sensibles en aval contre les dommages.\r\n

Composants de protection<\/h3>\r\nIts core protection components typically include:\r\n\r\nMetal oxide varistors (MOVs): Fast response, used to absorb medium-energy surges.\r\n\r\nGas discharge tubes (GDTs): High current capacity, commonly used to discharge high-energy initial surge currents.\r\n\r\nTransient voltage suppressor diodes (TVS): Precise voltage clamping and extremely fast response, commonly used to protect precision circuits.\r\n

Param\u00e8tres de performances<\/h3>\r\nMaximum Continuous Operating Voltage (Uc): The maximum DC voltage (e.g., 24V) that the equipment can safely withstand over a long period.\r\n\r\nNominal Discharge Current (In): The standard value for withstanding an 8\/20\u03bcs waveform inrush current, representing its conventional protection capability.\r\n\r\nMaximum Discharge Current (Imax): The maximum inrush current that the equipment can withstand in a single incident without damage.\r\n\r\nVoltage Protection Level (Up): The residual voltage across the equipment under an inrush. The lower this value, the better the protection for downstream equipment.\r\n\r\nResponse Time: The time from detecting an overvoltage to initiating action. The shorter the better.\r\n\r\n \r\n\r\n\"SPD<\/a>\r\n

Qu'est-ce qu'une alimentation 24 V CC ?<\/h2>\r\n

D\u00e9finition<\/h3>\r\nA 24V DC power supply is a device that converts AC mains power (such as 220V AC) or other power sources into and provides stable, clean 24V DC power. It is the \"heart\" of industrial control systems.\r\n

Fonction<\/h3>\r\nSes principales fonctions sont la conversion, la r\u00e9gulation de tension et le filtrage, garantissant qu'une alimentation continue et stable de 24 V CC peut \u00eatre fournie aux automates, capteurs, relais, actionneurs et autres \u00e9quipements, quelle que soit la fa\u00e7on dont la tension d'entr\u00e9e fluctue ou la fa\u00e7on dont la charge change.\r\n

Pourquoi le 24 V est devenu une tension standard industrielle<\/h3>\r\nSafe Voltage: Falls within the safe extra-low voltage (SELV) range, posing an extremely low risk of electric shock to humans.\r\n\r\nWide Compatibility: The vast majority of industrial sensors, controllers, and actuators are designed for 24V power supply.\r\n\r\nBalance of Loss and Efficiency: Compared to 12V, it draws less current, has lower line losses and voltage drops for the same power; compared to 48V, it offers higher safety and more cost-effective components.\r\n\r\nStandardization: It has become the common language in the global industrial automation field.\r\n

Indicateurs de performance cl\u00e9s<\/h3>\r\nOutput accuracy and stability: Voltage fluctuations and ripple noise should be minimized.\r\n\r\nEfficiency: High conversion efficiency means less energy loss and heat generation.\r\n\r\nProtection rating (IP): Protection against dust and water.\r\n\r\nOperating temperature range: Suitable for wide temperature requirements in industrial environments.\r\n

Sc\u00e9narios d'application<\/h3>\r\nLe parasurtenseur 24 V est largement utilis\u00e9 dans les lignes de production automatis\u00e9es en usine, les syst\u00e8mes de contr\u00f4le de processus, l'automatisation des b\u00e2timents, les stations de base de communication et les syst\u00e8mes solaires photovolta\u00efques.\r\n

Travailler en conjonction avec l'alimentation \u00e9lectrique<\/h2>\r\nA 24V DC power supply and a DC SPD form a perfect combination of source purification and path defense. The power supply ensures the provision of \"clean\" energy, while the SPD focuses on resisting external \"contamination\" (surges) from power lines or signal lines. They are usually connected in series in the circuit: after the AC power supply is converted to 24V DC, it is first \"filtered\" by the DC SPD before being sent to the terminal equipment, thus building a full-path protection solution from source to end.\r\n

Points cl\u00e9s pour la s\u00e9lection du SPD 24 V<\/h2>\r\nVoltage Matching: Ensure the SPD's Uc value is slightly higher than the system's maximum continuous operating voltage. For a 24V system, an SPD with a Uc of 30V or 35V is typically selected.\r\n\r\nProtection Level: Select an SPD with a sufficiently low Up value based on the withstand voltage capability of the protected equipment.\r\n\r\nCurrent Handling Capacity: Select appropriate In and Imax values \u200b\u200bbased on the installation location (e.g., main distribution terminal, equipment front end) and local thunderstorm day conditions.\r\n\r\nWiring Method: Confirm whether it is a parallel or series connection and match the corresponding terminal blocks.\r\n\r\nStatus Indication: Products with remote alarms or visual windows (e.g., green\/red) are preferred for ease of maintenance.\r\n

Installation et entretien<\/h2>\r\nInstallation: Install as close as possible to the protected equipment. Use short, straight, and thick wiring to reduce residual voltage from lead inductance. Ensure proper grounding.\r\n\r\nMaintenance: Regularly check the status indicator window (ideally annually or around the rainy season). If the indicator is faulty (e.g., turns red), replace it immediately. DC SPD manufacturer kindly reminds you to record lightning strike incidents and check the surge protector status promptly.\r\n

FAQ<\/h2>\r\nComment connecter un parasurtenseur CC<\/strong>\r\n\r\nLes SPD CC sont g\u00e9n\u00e9ralement connect\u00e9s en parall\u00e8le entre les bornes positives et n\u00e9gatives du circuit prot\u00e9g\u00e9, et leur borne de mise \u00e0 la terre doit \u00eatre connect\u00e9e \u00e0 la terre de protection (PE) du syst\u00e8me avec le fil le plus court et le plus \u00e9pais possible. Le manuel du produit doit \u00eatre strictement suivi.\r\n\r\nLes SPD 24 V CC et CA peuvent-ils \u00eatre utilis\u00e9s de mani\u00e8re interchangeable\u00a0?<\/strong>\r\n\r\nAbsolument pas. Les principes de conception, les capacit\u00e9s d\u2019extinction d\u2019arc et les \u00e9talonnages des param\u00e8tres des deux sont compl\u00e8tement diff\u00e9rents. Il est plus difficile d'utiliser un SPD DC pour couper le courant de suivi DC. Une mauvaise utilisation d'un SPD CA dans un circuit CC entra\u00eenera l'incapacit\u00e9 d'\u00e9teindre l'arc correctement, ce qui pourrait provoquer un incendie de l'\u00e9quipement.\r\n\r\nComment puis-je d\u00e9terminer si le SPD DC 24 V fonctionne toujours correctement\u00a0?<\/strong>\r\n\r\nThe most intuitive way is to observe its status indicator (usually a green\/red window or LED). Green indicates normal operation, while red\/off indicates failure and needs replacement. You can also use a multimeter to measure its online voltage; if it's close to a short circuit and the device is hot, it may be damaged.\r\n\r\nPourquoi les syst\u00e8mes solaires ont-ils besoin de dispositifs de protection contre les surtensions CC (SPD)\u00a0?<\/strong>\r\n\r\nLes modules photovolta\u00efques couvrent une vaste zone et sont tr\u00e8s sensibles aux coups de foudre directs ou induits. Le courant de foudre peut p\u00e9n\u00e9trer dans l'onduleur et le syst\u00e8me de contr\u00f4le via la ligne de bus CC, provoquant des dommages importants. Par cons\u00e9quent, l\u2019installation d\u2019un SPD DC photovolta\u00efque d\u00e9di\u00e9 c\u00f4t\u00e9 DC (entre les modules et l\u2019onduleur) est cruciale.\r\n\r\nQuelles pr\u00e9cautions de c\u00e2blage doivent \u00eatre prises lors de l'installation d'un SPD 24 V CC\u00a0?<\/strong>\r\n\r\nThe key principles are \"short, straight, and thick\". 1) The length of the grounding wire should be less than 0.5 meters; 2) Avoid forming loops; 3) The cross-sectional area of \u200b\u200bthe conductor must meet the requirements for discharging large current (usually not less than 4 mm\u00b2); 4) Ensure that all connection points are tight and free from oxidation.\r\n\r\nComparaison entre l'alimentation lin\u00e9aire et \u00e0 d\u00e9coupage dans les applications 24 V<\/strong>\r\n\r\nLes alimentations lin\u00e9aires ont une faible ondulation de sortie et un faible bruit, mais sont de grande taille et peu efficaces (environ 40-60%), ce qui les rend adapt\u00e9es aux \u00e9quipements de mesure de pr\u00e9cision extr\u00eamement sensibles au bruit. Les alimentations \u00e0 d\u00e9coupage sont de petite taille, tr\u00e8s efficaces (g\u00e9n\u00e9ralement > 85%) et peuvent s'adapter \u00e0 une large plage de tensions d'entr\u00e9e, ce qui en fait le choix courant pour le contr\u00f4le industriel. Cependant, leur commutation haute fr\u00e9quence g\u00e9n\u00e8re un certain bruit \u00e9lectromagn\u00e9tique, qui n\u00e9cessitepour \u00eatre correctement manipul\u00e9.\r\n

Conclusion<\/h2>\r\nIn industrial automation and new energy fields, 24V DC power supplies and DC surge protection devices are a complementary and indispensable core combination.\r\n\r\nTake action now to build a robust defense for your critical systems! Don't wait until a lightning strike or power surge causes irreparable damage to realize the importance of protection.","protected":false},"featured_media":1814,"parent":0,"menu_order":84,"template":"","meta":{"_acf_changed":false},"blog_category":[9],"class_list":["post-2288","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-industry-news"],"acf":{"des":"DC surge protection devices (DC SPD) and 24V DC power supplies are key components that together form a line of defense against transient overvoltages and ensure system continuity. Understanding their working principles, selection criteria, and synergistic effects is crucial for designing and maintaining safe and efficient electrical systems.","txt":"DC surge protection devices<\/a> (DC SPD) and 24V DC power supplies are key components that together form a line of defense against transient overvoltages and ensure system continuity. Understanding their working principles, selection criteria, and synergistic effects is crucial for designing and maintaining safe and efficient electrical systems.\r\n

What Is DC Surge Protection Device?<\/h2>\r\n

Definitions<\/h3>\r\nDC surge protection devices are lightning and surge protection devices specifically designed for DC circuits. They can respond within nanoseconds, safely discharging transient overvoltages (surges) caused by lightning induction, switching operations, or electrostatic discharge to the ground, thereby protecting sensitive downstream electronic equipment from damage.\r\n

Protective Components<\/h3>\r\nIts core protection components typically include:\r\n\r\nMetal oxide varistors (MOVs): Fast response, used to absorb medium-energy surges.\r\n\r\nGas discharge tubes (GDTs): High current capacity, commonly used to discharge high-energy initial surge currents.\r\n\r\nTransient voltage suppressor diodes (TVS): Precise voltage clamping and extremely fast response, commonly used to protect precision circuits.\r\n

Performance Parameters<\/h3>\r\nMaximum Continuous Operating Voltage (Uc): The maximum DC voltage (e.g., 24V) that the equipment can safely withstand over a long period.\r\n\r\nNominal Discharge Current (In): The standard value for withstanding an 8\/20\u03bcs waveform inrush current, representing its conventional protection capability.\r\n\r\nMaximum Discharge Current (Imax): The maximum inrush current that the equipment can withstand in a single incident without damage.\r\n\r\nVoltage Protection Level (Up): The residual voltage across the equipment under an inrush. The lower this value, the better the protection for downstream equipment.\r\n\r\nResponse Time: The time from detecting an overvoltage to initiating action. The shorter the better.\r\n\r\n \r\n\r\n\"BR-40<\/a>\r\n

What Is A 24V DC Power Supply?<\/h2>\r\n

Definition<\/h3>\r\nA 24V DC power supply is a device that converts AC mains power (such as 220V AC) or other power sources into and provides stable, clean 24V DC power. It is the \"heart\" of industrial control systems.\r\n

Function<\/h3>\r\nIts main functions are conversion, voltage regulation and filtering, ensuring that a continuous and stable 24V DC power supply can be provided to PLCs, sensors, relays, actuators and other equipment, regardless of how the input voltage fluctuates or how the load changes.\r\n

Why 24V Has Become Industrial Standard Voltage<\/h3>\r\nSafe Voltage: Falls within the safe extra-low voltage (SELV) range, posing an extremely low risk of electric shock to humans.\r\n\r\nWide Compatibility: The vast majority of industrial sensors, controllers, and actuators are designed for 24V power supply.\r\n\r\nBalance of Loss and Efficiency: Compared to 12V, it draws less current, has lower line losses and voltage drops for the same power; compared to 48V, it offers higher safety and more cost-effective components.\r\n\r\nStandardization: It has become the common language in the global industrial automation field.\r\n

Key Performance Indicators<\/h3>\r\nOutput accuracy and stability: Voltage fluctuations and ripple noise should be minimized.\r\n\r\nEfficiency: High conversion efficiency means less energy loss and heat generation.\r\n\r\nProtection rating (IP): Protection against dust and water.\r\n\r\nOperating temperature range: Suitable for wide temperature requirements in industrial environments.\r\n

Application Scenarios<\/h3>\r\n24V Surge protector is widely used in factory automated production lines, process control systems, building automation, communication base stations, and solar photovoltaic systems.\r\n

Working In Conjunction With Power Supply<\/h2>\r\nA 24V DC power supply and a DC SPD form a perfect combination of source purification and path defense. The power supply ensures the provision of \"clean\" energy, while the SPD focuses on resisting external \"contamination\" (surges) from power lines or signal lines. They are usually connected in series in the circuit: after the AC power supply is converted to 24V DC, it is first \"filtered\" by the DC SPD before being sent to the terminal equipment, thus building a full-path protection solution from source to end.\r\n

Key Points For Selecting 24V SPD<\/h2>\r\nVoltage Matching: Ensure the SPD's Uc value is slightly higher than the system's maximum continuous operating voltage. For a 24V system, an SPD with a Uc of 30V or 35V is typically selected.\r\n\r\nProtection Level: Select an SPD with a sufficiently low Up value based on the withstand voltage capability of the protected equipment.\r\n\r\nCurrent Handling Capacity: Select appropriate In and Imax values \u200b\u200bbased on the installation location (e.g., main distribution terminal, equipment front end) and local thunderstorm day conditions.\r\n\r\nWiring Method: Confirm whether it is a parallel or series connection and match the corresponding terminal blocks.\r\n\r\nStatus Indication: Products with remote alarms or visual windows (e.g., green\/red) are preferred for ease of maintenance.\r\n

Installation And Maintenance<\/h2>\r\nInstallation: Install as close as possible to the protected equipment. Use short, straight, and thick wiring to reduce residual voltage from lead inductance. Ensure proper grounding.\r\n\r\nMaintenance: Regularly check the status indicator window (ideally annually or around the rainy season). If the indicator is faulty (e.g., turns red), replace it immediately. DC SPD manufacturer kindly reminds you to record lightning strike incidents and check the surge protector status promptly.\r\n

FAQ<\/h2>\r\nHow To Connect DC Surge Protector<\/strong>\r\n\r\nDC SPDs are typically connected in parallel between the positive and negative terminals of the protected circuit, and their grounding terminal must be connected to the system protective earth (PE) with the shortest and thickest possible wire. The product manual should be strictly followed.\r\n\r\nCan 24V DC SPD And AC SPD Be Used Interchangeably?<\/strong>\r\n\r\nAbsolutely not. The design principles, arc-extinguishing capabilities, and parameter calibrations of the two are completely different. It is more difficult to use a DC SPD to cut off DC follow current. Misusing an AC SPD in a DC circuit will result in the inability to extinguish the arc properly, which may cause the equipment to catch fire.\r\n\r\nHow Can I Determine If DC 24V SPD Is Still Working Properly?<\/strong>\r\n\r\nThe most intuitive way is to observe its status indicator (usually a green\/red window or LED). Green indicates normal operation, while red\/off indicates failure and needs replacement. You can also use a multimeter to measure its online voltage; if it's close to a short circuit and the device is hot, it may be damaged.\r\n\r\nWhy Do Solar Systems Need DC Surge Protection Devices (SPD)?<\/strong>\r\n\r\nPhotovoltaic modules cover a large area and are highly susceptible to direct or induced lightning strikes. Lightning current can enter the inverter and control system through the DC bus line, causing significant damage. Therefore, installing a dedicated photovoltaic DC SPD on the DC side (between the modules and the inverter) is crucial.\r\n\r\nWhat Wiring Precautions Should Be Taken When Installing 24V DC SPD?<\/strong>\r\n\r\nThe key principles are \"short, straight, and thick\". 1) The length of the grounding wire should be less than 0.5 meters; 2) Avoid forming loops; 3) The cross-sectional area of \u200b\u200bthe conductor must meet the requirements for discharging large current (usually not less than 4 mm\u00b2); 4) Ensure that all connection points are tight and free from oxidation.\r\n\r\nComparison Between Linear And Switching Power Supply In 24V Applications<\/strong>\r\n\r\nLinear power supplies have low output ripple and low noise, but are large in size and low in efficiency (approximately 40-60%), making them suitable for precision measuring equipment that is extremely sensitive to noise. Switching power supplies are small in size, highly efficient (typically >85%), and can adapt to a wide input voltage range, making them the mainstream choice for industrial control. However, their high-frequency switching generates some electromagnetic noise, which needs to be properly handled.\r\n

Conclusion<\/h2>\r\nIn industrial automation and new energy fields, 24V DC power supplies and DC surge protection devices are a complementary and indispensable core combination.\r\n\r\nTake action now to build a robust defense for your critical systems! Don't wait until a lightning strike or power surge causes irreparable damage to realize the importance of protection."},"_links":{"self":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/blog\/2288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/media\/1814"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/media?parent=2288"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/fr\/wp-json\/wp\/v2\/blog_category?post=2288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}