Types of Doorbell Transformers

Written by brian coughlin
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Types of Doorbell Transformers
Transformers are necessary for proper doorbell function. (Thinkstock Images/Comstock/Getty Images)

Doorbell transformers are the components responsible for the electric current that powers the doorbell. They act like an electrical pump, pushing electrons out of one terminal and pulling them back in the other terminal. In essence, this creates an electrical loop when you push the doorbell button. When the loop is created, the electrons in the loop vibrate and make sound. Installing the proper size will ensure that the doorbell functions properly.

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Flexible Split-Core Current Transformers

Flexible split-core transformers are composed of silicon steel and copper. The silicon capsule protects the core against dirt, oil, moisture and corrosion. These cannot be exposed to temperatures above 55 degrees Celsius. For safety, the split-core transformer also has a clamping circuit that limits power to the transformer to prevent high-voltage problems when opened.

Flexible Split-Core Current Transformer UL-Recognized

Flexible split-core current transformers that are Underwriters Laboratories-recognised are made of silicon steel and copper. These also have a silicon rubber capsule that protects against damaging elements. This transformer cannot be exposed to temperatures above 55 degrees Celsius. They are used with any 5-amp indicating or recording ammeter or amp watt transducer.

Removable Leg Current Transformers

Removable leg current transformers are constructed of noryl polythene. They are stranded and colour-coded for easy installation. A clamp provides protection against voltage issues. It clamps to 1 volt within 10 microseconds. It is known for its measurement accuracy and can be identified by its removable leg.

Split-Core Current Transformers

Split-core current transformers are known for their weatherproof features. They can be assembled without a primary bus or cable. They are UL-recognised. The casing is UV-stabilised to allow this transformer to be used outdoors.

Low Ratio Split-Core Current Transformers

Low ratio split-core current transformers are UL-recognised. They have a frequency of 50-400Hz and weigh about 0.544kg. They have an accuracy range of 3 per cent to 1 per cent and can carry a voltage burden of 2VA to 5VA, depending on the model.

AC Voltage Output Split-Core Current Transformers

AC voltage output split-core current transformers are used for watt transducers and current transducers. They have AC outputs of 01.A, 1.0A, 5A, 0.333V, 1V, and 5V. 0.1A AC transformers also have a clamping circuit that protects against dangerous current levels when opening the transformer. There are three AC voltage transformer sensor sizes; A, B, and C. The sensor size plays a part in the current input and output.

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