What is the secondary voltage rating of a transformer used for low voltage applications?

The secondary voltage rating of a transformer for low voltage applications is commonly 24 volts. This voltage is widely used in various fields, including HVAC systems, safety control circuits, and low voltage lighting. The choice of 24 volts is favored for several reasons: it is low enough to minimize the risk of electric shock while still providing adequate power for many low voltage devices.

In many applications, using 24 volts helps in ensuring compatibility with standard equipment, as many components are designed to operate within this voltage range. This makes it an industry standard, particularly in control systems where low voltage is crucial for safety and efficiency.

Other voltage ratings, such as 12 volts or 48 volts, while they exist, serve different specific applications. Meanwhile, 120 volts is considered standard line voltage and is generally classified as high voltage in relation to low voltage applications. Thus, 24 volts is the most commonly recognized secondary voltage for low voltage transformers.