I designed our own block detectors as an inexpensive alternative to purchasing remade modules.

PCB Build

(Still waiting for J4 screw terminals to arrive - this is what connects back to the CMRI node)

Quick and dirty, but using the same current transformer that the NCE version uses (1:200 turn ratio)

LED1 electrically does not have a polarity as it voltage is AC and swings positive and negative

Wiring

Install on the red wire side of the feeder.

20 Jul 2022 TODO: Add example of installed detector.

Demonstration

This video demonstrates over-current and reset using a 2A high current short in parallel with a 200mA load across the track. Over-current LED comes on and resets with 200mA load on the track after the short is removed.

BOM

Item	PN	Vendor
200 turn CT		Arrow
PTC		Digikey
R2,R3	470 ohm

Single wire through current transformer is xx" long

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