(Kit - Soldering Required)

telephone switch
(front view)

phone switcher
(back view)
diy k140

Telephone Relay Switcher Kit

This device connects to the telephone line and can be used to remotely control up to 4 relay outputs using a DTMF (tone dialing) telephone. A number of user settings are available to improve the usability and security of the device. The kit comes complete with a small plastic case with silk-screened front and rear panels.


  • 4 Output relays contacts rated at 12Amps/250 Volts AC, 15Amps/24VDC.

  • Operating voltage 12VDC, 2.5mm DC power jack.
    (Need a Power Supply?)

  • Operating current 30mA with no relays operated, 120mA with all relays operated.

  • 2 - RJ11 sockets for telephone line.

  • 4 - 3-way pluggable screw terminals for relay contacts.

  • Case size (6.1 x 4 x 1.3).

  • Following items are user settings: Password, Tamper Control, Rings to answer, Auto Hangup Time, and Lockout.

See CK0603.pdf for complete details, including schematic and theory of operation.  Requires Adobe Acrobat Reader available at for FREE!


Note: This is a kit, you will receive parts to build the item pictured.  If you do not know how to solder you can check out our learn to solder kit. CK0603 - Telephone Relay Switcher Kit - $69.95

Quantity and Educational discounts?


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