Railroad switch machine

Details Railroad switch machine Railroad switch machine

B - Operations, Transporting

61

L

B61L 5/06 (2006.01) B61L 5/10 (2006.01) B61L 19/08 (2006.01) H02H 7/08 (2006.01)

Patent

CA 2638954

A switch machine that includes a first relay having first normally open contacts and first normally closed contacts provided in the normal motor connection path and a second relay having second normally open contacts and second normally closed contacts provided in the reverse motor connection path. The normally open and closed contacts of each relay are associated in pairs and the first relays are structured such that each normally closed contact and the corresponding normally open contact cannot be simultaneously closed. Also, a method of protecting a motor of a switch machine that includes integrating a current being drawn by the motor and opening a motor circuit that includes the motor if the integrated current exceeds a threshold.

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