Control Supply Voltage used in Industry

In Industrial settings, control supply voltage plays a crucial role in ensuring that machinery and equipment operate smoothly and reliably. From factories to power plants, control supply voltage is used to regulate the flow of electricity to various components, such as motors, sensors, and relays, that control the operation of machines and processes. In this article, we will provide an overview of control supply voltage or supply control and its importance in industry.

    Control Supply Voltage used in Industry

    Control Voltage is used as supply voltage to all field instruments / Operator Interfacing Push buttons (All Inputs and Outputs)
    Control Voltage is basically low voltage i.e.. 24V DC Control Voltage for Safety, Reliability.

    Most widely used Control supply voltage is 24 VDC.

    Modern trend is to use 24V DC control voltage. In some older plants still 115V AC is in use. But for new instruments people prefers 24V DC.

    In case of 115V AC, don't forget to use arc suppressor at PLC output

    There are two basic components to virtually every manufacturing process: motors and the devices that control them. Typically, control devices are large and operate on the same voltage used to power the motors. This will result in large motor-control centers that may not provide maximum reliability.

    By using 24V DC as a control voltage, manufacturers can increase reliability. One reason for this is that these power supplies operate with limiting circuits to protect against short circuits. In the event of a short, they simply shut down. They eliminate the need for fuses and the time needed to replace them. When the short is cleared, 24V DC power supplies function normally, costing the operator less downtime.

    Regarding safety, each year thousands of workers are shocked by 110V AC electrical control systems, usually because they are not wearing prescribed safety gear. Unlike AC power, 24V DC does not require the use of personal safety equipment. Maintenance can be performed safely on energized circuits. If an accident occurs that exposes 24V DC wiring, there is no potential for personnel injury. Because power is limited, equipment is also well protected.

    Control Supply Voltage Used in Industry | What is 24VDC used for?

    • Control supply voltage in industry refers to the voltage used to power control circuits and devices that regulate the operation of industrial equipment.
    • The most common control supply voltage used in industry is 24V DC, but other voltages such as 12V DC, 48V DC, and 120V AC may also be used depending on the specific application.
    • Control supply voltage is typically supplied by a dedicated power supply unit (PSU) that converts the input voltage to the desired output voltage level.
    • The use of regulated DC power supplies is common in industrial control systems to ensure stable and precise control supply voltage output.
    • Control supply voltage is an important parameter in the design and operation of industrial equipment, and deviations from the specified voltage range can lead to malfunction or damage to the equipment.
    • Electrical safety regulations require that control supply voltage circuits are isolated from other circuits and that appropriate protective measures are in place to prevent electric shock or other hazards.
    • The use of voltage regulators, surge protection devices, and other protective measures can help to ensure the reliability and safety of industrial control systems.

    What is Control Supply Voltage?

    Control supply voltage is a low-voltage power supply that is used to power the control circuits of electrical equipment. It typically ranges from 24V DC to 120V AC, depending on the specific application. The voltage is often step-down from the main power supply voltage to a lower voltage that is safe for the control circuit components. Control supply voltage is essential because it powers the relays, contactors, timers, and other components that control the operation of machinery and equipment.
    Importance of Control Supply Voltage in Industry
    Control supply voltage is critical for ensuring the safe and reliable operation of electrical equipment in industrial settings. A stable and well-regulated control supply voltage prevents equipment damage, reduces downtime, and improves the overall efficiency of processes. Without proper control supply voltage, equipment may experience voltage spikes or drops that can damage sensitive electronic components, cause erratic operation, or even result in equipment failure.

    Types of Control Supply Voltage

    There are two main types of control supply voltage used in industry: DC and AC. DC control supply voltage is often used for low-power applications, such as control circuits for sensors, switches, and small motors. AC control supply voltage is used for high-power applications, such as the control circuits for large motors, pumps, and compressors.

    Control Supply Voltage Regulation

    To ensure that the control supply voltage is stable and well-regulated, various devices are used, such as transformers, regulators, and power supplies. These devices are designed to step-down or step-up the voltage, depending on the application, and provide a stable output voltage that is within the acceptable range for the control circuit components.


    Control supply voltage is a critical component in the operation of machinery and equipment in industrial settings. Its stability and regulation are essential for preventing equipment damage, reducing downtime, and improving the overall efficiency of processes. As such, it is important to ensure that the control supply voltage is well-regulated and within the acceptable range for the control circuit components. By doing so, companies can ensure that their equipment operates safely and reliably, leading to increased productivity and profitability.

    Frequently Asked Questions (FAQ)

    What is 24VDC used for?

    24VDC (24 volts DC) is commonly used in a variety of applications, including industrial control systems, automation, and building management systems. It is often used to power control circuits, such as relays, sensors, and switches, that regulate the operation of machinery and equipment. Additionally, 24VDC is used in low-voltage lighting systems and is a popular choice for powering electronic devices that require a low-voltage power supply. Its low voltage makes it a safer option compared to higher voltage power supplies, reducing the risk of electric shock and equipment damage.

    What is 24 VDC power supply?

    A 24 VDC power supply is an electrical device that converts AC (alternating current) power from a mains power source into DC (direct current) power at a voltage level of 24 volts. This type of power supply is commonly used in industrial control systems, automation equipment, and other electronic devices that require a stable DC voltage for operation.

    What is DC control voltage?

    DC control voltage refers to a constant voltage that is used to control the operation of electrical devices, such as motors, relays, and switches. This voltage is typically supplied by a power source, such as a battery or power supply, and is used to activate or deactivate the device in question. The DC control voltage may be varied in order to adjust the speed, intensity, or other characteristics of the device, and is an important element in many electronic and electrical systems.

    Why DC is used in control circuit?

    DC (direct current) is commonly used in control circuits because it provides a constant and reliable source of power that can be easily regulated and controlled using various electronic devices such as transistors, diodes, and capacitors. Unlike AC (alternating current), which oscillates in both direction and magnitude, DC flows in a single direction, making it ideal for powering electronic devices that require stable and predictable voltage levels. Additionally, DC circuits are generally more efficient than AC circuits, which means that they consume less power and generate less heat.

    What are the 2 types of DC power supply?

    There are two types of DC power supply: regulated and unregulated. A regulated DC power supply maintains a constant output voltage regardless of changes in input voltage or load, whereas an unregulated DC power supply does not maintain a constant output voltage and can vary depending on input voltage and load. Regulated DC power supplies are often preferred for applications where precise and stable voltage output is required, while unregulated DC power supplies are typically used in applications where a slight variation in voltage output is acceptable.

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