DH905 16V 10 Watt Doorbell Transformer for Wired Doorbells


16 Volt AC, 10 VA (watts) transformer. For use with single chimes, bells, buzzers, and other applications within specified ratings.

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This easy-to-install, versatile 16-VAC, 10-watt doorbell transformer works with single doorbells, buzzers, bells, and other products with requirements within these specified ratings.

Household voltage ratings are 120 Volts, but most doorbell systems operate at 16 Volts.  A transformer wires into your home electrical circuit and steps down the voltage to a specific rating for your device.

In most applications, a wired doorbell pushbutton is connected to a transformer.  A signaling device such as a buzzer, signal bell, doorbell, or even a siren or strobe light is also connected to the transformer.  When the circuit is closed, in this case the push button is pressed, the circuit is completed and the signaling device is activated by the transformer.

This transformer is UL and CSA approved for commercial and residential usage.

  • 16VAC, 10 Watt
  • UL and CSA approved
  • Manufactured by Thomas and Betts
  • 1-year manufacturer’s warranty
  • Call for bulk discounts

The DH905 by Thomas & Betts is a 16V, 10VA wired doorbell transformer designed to work with standard wired doorbells.  The image below is a quick example of how to wire in two wired doorbell push buttons and a common wired doorbell to the transformer.

wiring doorbell transformer to two buttons
wiring doorbell transformer to two buttons


No Of Doorbells To Power

Transformer Voltage


Transformer VA

Volta amps