secondary 24vac transformer supply

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View Details KMC XEE-6311-075 Transformer; MULTI TAP TO 24VAC 75VA  | Blackhawk Supply
$29.15 each


How Do 24VAC Transformers Work?

Transformers are electrical devices that are used to transfer electrical energy from one circuit to another. 24VAC transformers are specifically designed to produce an output voltage of 24 volts of alternating current (VAC). These transformers are widely used in various applications such as doorbells, industrial controls, air conditioning systems, and low-voltage lighting systems.

In this blog post, we will explore the working principle of 24VAC transformers, their types, and components, and the benefits of using them.

Introduction Before diving into the specifics of 24VAC transformers, let's define what a transformer is. A transformer is an electrical device that consists of two coils of wire, called the primary winding and the secondary winding. These two coils are magnetically coupled and are used to transfer electrical energy from one circuit to another.

Types of 24VAC Transformers

There are several types of 24VAC transformers, including:

  • Doorbell transformer: As the name suggests, this type of transformer is used in doorbell systems. These transformers are usually small and provide a low power output of around 10-20VA.
  • Industrial control transformer: This type of transformer is used in industrial control systems to provide power to various control devices such as relays, timers, and solenoids. These transformers have a higher power output of up to 500VA.
  • Wall adapter transformer: This type of transformer is commonly used in electronic devices such as chargers and power supplies. These transformers are usually small and lightweight and can provide a power output of up to 60 VVA.

Components of a 24VAC Transformer

24VAC Transformer

All 24VAC transformers have two essential components: the primary windings and the secondary windings.

  • Primary winding: The primary winding is the coil of wires connected to the input voltage source. When the AC current is applied to the primary winding, it generates a magnetic field that induces a voltage in the secondary winding.
  • Secondary winding: The secondary winding is the coil of wires connected to the load. The induced voltage in the secondary winding is proportional to the turn ratio of the primary and secondary windings.

Working Principle of a 24VAC Transformer

The working principle of a 24VAC secondary transformer is based on the principle of electromagnetic induction. A 24VAC secondary transformer is a type of transformer that has a secondary winding that is designed to produce an output voltage of 24 volts AC (alternating current).

The transformer consists of two coils of wire: the primary winding and the secondary winding. The primary winding is connected to an AC voltage source, and the secondary winding is connected to the load. When an AC voltage is applied to the primary winding, it creates a magnetic field that fluctuates at the same frequency as the input voltage.

This fluctuating magnetic field induces an AC voltage in the secondary coil, which is proportional to the number of turns in the secondary coil. The turn ratio between the primary and secondary windings determines the output voltage of the transformer. For example, if the turn ratio is 1:1, the output voltage will be the same as the input voltage.

The induced secondary voltage depends on the ratio of the number of turns in the primary and secondary transformer windings. For instance, a transformer with a turn ratio of 1:2 will produce lower voltage output: half of the input voltage. This means that if you apply an input voltage of 24 volts to the primary winding, the secondary winding will produce an output voltage of 12 volts.

The output voltage of the transformer is determined by the turn ratio and the input voltage. The voltage will remain constant as long as the input voltage remains constant, and the load impedance remains within the rated range of the transformer.

Benefits of Using 24VAC Transformers


There are several benefits of using 24VAC transformers:

  • Safety: 24VAC transformers are considered safe because they produce a low voltage output. This voltage is not hazardous to humans, even if they come into direct contact with the circuit.
  • Efficiency: Transformers are highly efficient devices, with efficiency levels of up to 98%. This means that only a small amount of energy is lost during the energy transfer process.
  • Reliability: Transformers are simple devices with no moving parts. This makes them highly reliable and requires little maintenance.
  • Flexibility: 24VAC transformers can be used in a wide range of applications, from doorbells to industrial control systems.

24 VAC Secondary Transformers We Offer

The Blackhawk Supply store offers a range of 24VAC Secondary Electrical Transformers.

  • Available options include different types of protection such as circuit breakers, fuses, inherent protection, or no protection at all.
  • Hub options are available in dual or single configurations, while insulation is either class 2 or general.
  • Mounting options include foot, plate, 1 foot, 1 hub, or 2 hubs.
  • Customers can choose from a variety of power consumption options ranging from 20VA to 240VA.
  • Primary voltages include 120V, 208V, 220V, 240V, 24V, 277V, and 480V.
  • Supply power voltage AC options include 120VAC, 208VAC, 220VAC, 24VAC, and 277VAC.
  • Customers can also choose between US-made and non-US-made products.
  • The transformers come in various VA ratings such as 40VA, 75VA, 100VA, 150VA, 175VA, 240VA, 300VA, 375VA, 50VA, 85VA, and 96VA.


If you need a 24VAC transformer for your project, you can find a wide selection of high-quality transformers at Blackhawk Supply. We provide various types of 24VAC transformers from reputable brands to ensure that you get the best quality products.

We offer countless lines and product models in our electrical supply category. Whether you are looking for wiring, enclosure, fuse, or circuit breaker, we've got you covered. Visit Blackhawk Supply today and shop for all the electrical supplies you need for your project!

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