{"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\/pt\/blog\/what-is-dc-surge-protection-device-what-is-a-24v-dc-power-supply\/","title":{"rendered":"O que \u00e9 um dispositivo de prote\u00e7\u00e3o contra surtos de CC? O que \u00e9 uma fonte de alimenta\u00e7\u00e3o de 24 Vcc?"},"content":{"rendered":"Dispositivos de prote\u00e7\u00e3o contra surtos CC<\/a> (DC SPD) e fontes de alimenta\u00e7\u00e3o de 24 Vcc s\u00e3o componentes essenciais que, juntos, formam uma linha de defesa contra sobretens\u00f5es transit\u00f3rias e garantem a continuidade do sistema. Compreender os seus princ\u00edpios de funcionamento, crit\u00e9rios de sele\u00e7\u00e3o e efeitos sin\u00e9rgicos \u00e9 crucial para projetar e manter sistemas el\u00e9tricos seguros e eficientes.\r\n

O que \u00e9 dispositivo de prote\u00e7\u00e3o contra surtos DC?<\/h2>\r\n

Defini\u00e7\u00f5es<\/h3>\r\nDispositivos de prote\u00e7\u00e3o contra sobretens\u00f5es CC s\u00e3o dispositivos de prote\u00e7\u00e3o contra raios e sobretens\u00f5es projetados especificamente para circuitos CC. Eles podem responder em nanossegundos, descarregando com seguran\u00e7a sobretens\u00f5es transit\u00f3rias (surtos) causadas por indu\u00e7\u00e3o de raios, opera\u00e7\u00f5es de comuta\u00e7\u00e3o ou descarga eletrost\u00e1tica para o solo, protegendo assim equipamentos eletr\u00f4nicos sens\u00edveis a jusante contra danos.\r\n

Componentes de prote\u00e7\u00e3o<\/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

Par\u00e2metros de desempenho<\/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

O que \u00e9 uma fonte de alimenta\u00e7\u00e3o de 24 Vcc?<\/h2>\r\n

Defini\u00e7\u00e3o<\/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

Fun\u00e7\u00e3o<\/h3>\r\nSuas principais fun\u00e7\u00f5es s\u00e3o convers\u00e3o, regula\u00e7\u00e3o de tens\u00e3o e filtragem, garantindo que uma fonte de alimenta\u00e7\u00e3o cont\u00ednua e est\u00e1vel de 24 Vcc possa ser fornecida a CLPs, sensores, rel\u00e9s, atuadores e outros equipamentos, independentemente de como a tens\u00e3o de entrada flutua ou como a carga muda.\r\n

Por que 24 V se tornou tens\u00e3o padr\u00e3o industrial<\/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

Principais indicadores de desempenho<\/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

Cen\u00e1rios de aplica\u00e7\u00e3o<\/h3>\r\nO protetor contra surtos de 24 V \u00e9 amplamente utilizado em linhas de produ\u00e7\u00e3o automatizadas de f\u00e1brica, sistemas de controle de processos, automa\u00e7\u00e3o predial, esta\u00e7\u00f5es base de comunica\u00e7\u00e3o e sistemas solares fotovoltaicos.\r\n

Trabalhando em conjunto com fonte de alimenta\u00e7\u00e3o<\/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

Pontos-chave para selecionar 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

Instala\u00e7\u00e3o e manuten\u00e7\u00e3o<\/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

Perguntas frequentes<\/h2>\r\nComo conectar o protetor contra surtos DC<\/strong>\r\n\r\nOs SPDs CC s\u00e3o normalmente conectados em paralelo entre os terminais positivo e negativo do circuito protegido, e seu terminal de aterramento deve ser conectado ao aterramento de prote\u00e7\u00e3o (PE) do sistema com o fio mais curto e grosso poss\u00edvel. O manual do produto deve ser rigorosamente seguido.\r\n\r\nO SPD de 24 Vcc e o SPD de CA podem ser usados \u200b\u200bde forma intercambi\u00e1vel?<\/strong>\r\n\r\nAbsolutamente n\u00e3o. Os princ\u00edpios de design, capacidades de extin\u00e7\u00e3o de arco e calibra\u00e7\u00f5es de par\u00e2metros dos dois s\u00e3o completamente diferentes. \u00c9 mais dif\u00edcil usar um DC SPD para cortar a corrente cont\u00ednua DC. O uso indevido de um SPD CA em um circuito CC resultar\u00e1 na incapacidade de extinguir o arco adequadamente, o que pode causar inc\u00eandio no equipamento.\r\n\r\nComo posso determinar se o SPD DC 24V ainda est\u00e1 funcionando corretamente?<\/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\nPor que os sistemas solares precisam de dispositivos de prote\u00e7\u00e3o contra surtos de CC (SPD)?<\/strong>\r\n\r\nOs m\u00f3dulos fotovoltaicos cobrem uma grande \u00e1rea e s\u00e3o altamente suscet\u00edveis a descargas atmosf\u00e9ricas diretas ou induzidas. A corrente do raio pode entrar no inversor e no sistema de controle atrav\u00e9s da linha do barramento CC, causando danos significativos. Portanto, a instala\u00e7\u00e3o de um SPD CC fotovoltaico dedicado no lado CC (entre os m\u00f3dulos e o inversor) \u00e9 crucial.\r\n\r\nQuais precau\u00e7\u00f5es de fia\u00e7\u00e3o devem ser tomadas ao instalar SPD de 24 Vcc?<\/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\nCompara\u00e7\u00e3o entre fonte de alimenta\u00e7\u00e3o linear e chaveada em aplica\u00e7\u00f5es de 24 V<\/strong>\r\n\r\nAs fontes de alimenta\u00e7\u00e3o lineares t\u00eam baixa ondula\u00e7\u00e3o de sa\u00edda e baixo ru\u00eddo, mas s\u00e3o grandes em tamanho e baixa efici\u00eancia (aproximadamente 40-60%), tornando-as adequadas para equipamentos de medi\u00e7\u00e3o de precis\u00e3o extremamente sens\u00edveis a ru\u00eddo. As fontes de alimenta\u00e7\u00e3o chaveadas s\u00e3o pequenas, altamente eficientes (normalmente >85%) e podem se adaptar a uma ampla faixa de tens\u00e3o de entrada, tornando-as a escolha principal para controle industrial. No entanto, a sua comuta\u00e7\u00e3o de alta frequ\u00eancia gera algum ru\u00eddo eletromagn\u00e9tico, que precisapara ser devidamente manuseado.\r\n

Conclus\u00e3o<\/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\/pt\/wp-json\/wp\/v2\/blog\/2288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog"}],"about":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/types\/blog"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/media\/1814"}],"wp:attachment":[{"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/media?parent=2288"}],"wp:term":[{"taxonomy":"blog_category","embeddable":true,"href":"https:\/\/www.britecelectric.com\/pt\/wp-json\/wp\/v2\/blog_category?post=2288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}