Shunt Signals

Westinghouse produced two styles of electric shunt signals, These are easily distinguished by the style of lid / top cover. There is the sloping top style with the top cover angled at around 40 degrees, as show below, and the flat top series which is depicted further down this page

Both styles work with a 110v AC supply to work a two coil DC solenoid in the base of the signal which in turn pushes mechanical rods upwards from the base unit to turn the signal face through 45 degrees. Electrical rectifiers are provided with the unit to convert the AC supply to DC to operate the solenoid coils.

Electrical contacts are provided within the top unit for detection of the position of the signal face, being 'ON' or 'OFF', thus providing a means of indication to the signal box. An additional contact is also provided for economizing the solenoid coil. The economizer contact cuts the supply to to one of the solenoid coils when the signal is in the 'OFF' position thus reducing power consumption and heat within the solenoid coil..

Westinghouse shunt signal

The sloping lid style electrical shunt in the 'ON' Position. Signals located at Hampton Court Junction see web page for more detail. Picture copyright © Mark Adlington.

Westinghouse shunt signal

The sloping lid style electrical shunt in the 'OFF' Position. Signals located at Hampton Court Junction see web page for more detail. Picture copyright © Mark Adlington.

Westinghouse shunt signal

Looking inside the sloping lid style electrical shunt with the electrical contacts on the right hand side {they look like silver fingers} The AC/DC rectifiers for the solenoid coil are located on the right hand side, the rectifiers are modern silicon versions, the orignals would have been large metal oxide versions. Signals located at Hampton Court Junction see web page for more detail. Picture copyright © Mark Adlington.

Westinghouse shunt signal

Rear view of the sloping style shunt signal, with the electrical connection box on the rear. Signals located at Hampton Court Junction see web page for more detail. Picture copyright © Mark Adlington.

Westinghouse electric shunt signals flat top x 2

The flat top style electrical shunt in the 'ON' Position [left hand one] and the 'OFF' postion [right hand one], with its built in flood light. Signals located at Hampton Court Junction see web page for more detail.
Picture copyright © Mark Adlington.

Westinghouse shunt signal

Rear view of the flat top style shunt signal, all the electrical connections are located in the top of the signal.
Signals located at Hampton Court Junction see web page for more detail. Picture copyright © Mark Adlington.