This is used mostly for block wiring, not DCC. Then, as the train comes around the loop and approaches the other end of the reverse loop, the main line polarity has to be reversed by the second DPDT switch to accept the train coming back in a reverse direction. When the train approaches the reverse loop and the turnout is pointed toward the right, the DPDT switch for the reverse loop polarity is set so that the polarity is lined up for that route. Each switch changes the polarity of the track one way or the other. For example, you can hook the main line tracks to one switch and the reverse loop section of track to the other switch. These are used primarily for wiring reversing loops and wye tracks. Each Atlas Twin switch has 2 DPDT switches. Each Atlas Connector switch is a collection of 3 simple SPST switches. The other way turns B positive and A negative. One way turns Rail A positive and Rail B negative. This can be used to control track polarity of an isolated section of track. Flip the switch to turn B on and A off.ĭPDT - One way turns 2 things on and 2 other things off. SPST - Turns one light (or track) on or off.ĭPST - Turns two separate things on or off using one switch.
Flip it the other way, Light B comes on and A goes off. In other words, if you flip the switch one way, Light A comes on and Light B goes off. Or you have either one section of track powered on or another but not both at the same time. You have either one light on or another but not both. A double throw switch is an "either-or" type switch. One flip of the switch turns the light on, Flip the switch the other way and it turns off. The single throw electrical switch is an "on-off" type switch. A double pole switch can control 2 accessories. If you use a single pole switch, it will control one accessory. The difference between single pole and double pole electrical switches is the number of items that the switch can control. How do you know when to use the Atlas Selector, Connector, Twin and Relay Switches? Hopefully, this page will help clear things up. Many modelers like to use the Atlas switches for their control panels to try to simplify the process, but even these are confusing sometimes. For example, what is the difference among the SPST, DPST, SPDT or DPDT varieties? What do all those letters mean? It can often be quite confusing trying to decide what kind of switch to use when. Lots of different types of electrical switches can be used in wiring your model railroad.
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