21110-3

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21110-3 is an international standard for voltage sensors, primarily intended for use with safety extra-low voltage (SELV) and protective extra-low voltage (PELV) systems. As such, it is used to measure voltage in a variety of industrial and commercial applications. It is designed for input voltages of up to 250V AC RMS (Root Mean Square) and operates in both AC (alternating current) and DC (direct current) forms, making it suitable for a wide range of applications.

The 21110-3 standard is divided into three, distinct parts. The first part of the standard defines the use of safety extra-low voltage systems and their associated components. This section also outlines the minimum safety requirements for these systems, including defining the input voltage range and the acceptable levels of insulation and fault protection.

The second part consists of specifications regarding the accuracy of the voltage sensor. This includes details on the various types of accuracy classes available, as well as how the wattage and power flux of various voltage measurements affect accuracy. It also outlines how voltage transducers should be adjusted for specific voltage levels.

The third part of the 21110-3 standard focuses on the mechanical aspects of the voltage sensor. This includes details such as the housing type, input connector type, and the overall dimensions of the product, as well as information about which environmental conditions the sensor is designed to withstand.

The 21110-3 works by drawing a voltage value, then using circuitry within the voltage sensor to convert this value to an analog signal that is sent to the device monitoring the voltage. This analog signal is then converted into digital form, and is used to compare against a stored voltage reference, before a decision is made regarding the accuracy of the voltage measurement. This decision can then be used to determine whether the voltage is within an acceptable range.

Since the 21110-3 was intended for use in safety extra-low voltage systems, it was designed to reduce the risk of fire and injury due to faults caused by incorrect voltage measurements. As such, it is essential that all components of the system are designed to meet the minimum safety requirements laid out in the standard, in order to ensure the safe and reliable operation of the system.

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