The CTs used in Schneider Electric HDM enclosures are manufactured by FlexCore. Three different FlexCore models are used, the AL series, the 5ARL series and the 2DARL series.
The 50A and 100A are the AL series with a 1.05" window.
The 125A are the 2DARL series with a 1.00" window.
The 150, 200, 250, and 400A are all the 5ARL series with a 1.56" window.
Please see the documents under attachments below for product specifications.

CT Part Numbers for HDM Enclosures

HDMCT050S1 - 50 AMP HDM SOLID CORE CT 1.05" WINDOW
HDMCT100S1 - 100 AMP HDM SOLID CORE CT 1.05" WINDOW
HDMCT125S1 - 125 AMP HDM SOLID CORE CT 1.00" WINDOW
HDMCT150S1 - 150 AMP HDM SOLID CORE CT 1.56" WINDOW
HDMCT200S1 - 200 AMP HDM SOLID CORE CT 1.56" WINDOW
HDMCT250S1 - 250 AMP HDM SOLID CORE CT 1.56" WINDOW
HDMCT400S1 - 400 AMP HDM SOLID CORE CT 1.56" WINDOW

*Note: Larger CTs can be ordered through Energy Solutions Sales by calling 615-287-3535 (option 3 for Sales)


HDM CT Requirements

Non-Flexcore CTs can be used in the place of HDMCTs provided the following requirements are met:

Metering-class CT with a 5A nominal, 6A maximum rated secondary leads should have ring lug or similar terminals for proper connection

*Please note the dimensions in the Digest (edition 175) are incorrect.