QSI PowerGuard Spike Detector USED

PowerGuard is a surge protector for shielding your locomotive electronics from spikes.

It is a small box that easily hooks up to the negative and positive posts of your transformer. It is added to the posts, not placed “in-line” between the posts and the track.

It has a red light that illuminates when power is first applied and each subsequent time that it detects and suppresses a power spike. It also has two green lights, one marked “horn” and the other “bell,” for measuring power (bright is high, dim is low). A switch allows you to select between conventional transformers like the ZW or the TrainMaster system.

• No damage
• No box
• For O gauge transformers