RTSCD ATS

Single-operator RTS Series version “A” automatic transfer switches offer a dependable means of transferring power from one source to another and back again using open-transition transfer. These switches are ideal for resistive load applications where no time delay (to allow inductive load voltages to decay) is needed.

Dual-operator RTS Series version “B”  automatic transfer switches allow inductive loads to be re-energized with normal inrush starting current after transfer. These inductive loads typically involve large 3-phase motors or transformers.

A time delay between the opening of the closed contacts and the closing of the open contacts allows large motor loads to demagnetize before transfer. This prevents the severe “bump” caused by switching a rotating motor (which momentarily acts as a generator) from one source to another source that is not in synchronism. This transition time delay is approximately 400 milliseconds, but it may be increased through the switch’s controller.

White paper on switching inductive loads