**Details** Output transistors are rated for 24V/0.5A. To activate a transistor, set the corresponding control line LOW. When left unconnected, control lines default to HIGH (and, hence, transistors will be closed). Combine this Tibbit with terminal block devices -- #20 (nine terminal blocks) or #21 (four terminal blocks). **LEDs** There are two red LEDs, which are connected to two transistor control lines. LEDs light up for the LOW state of control lines (i.e. when transistors are opened). **Typical connection diagram** The diagram below shows an external 24V power supply and two loads connected to the outputs of Tibbit #59. ![Connection Diagram](http://docs.tibbo.com/phm/tibbit-59_connection_diagram.png)