Issue:
The customer is asking how to hardwire an SRT10KRMTF or APTF10KT01 stepdown transformer to have a 120, 120/208, or 120/240 output.
Product Line:
Smart-UPS / Smart-UPS Online / SRT10KRMTF / APTF10KT01
Environment:
All Serial Numbers
Cause:
Unbalanced UPS outputs require a stepdown transformer to power 120v loads
Solution:
Note: This document refers to installing the SRT10KRMTF and APTF10KT01 transformers in a North American 120/240 or 120/208 environment only.
The wiring block outputs are as follows:
Please make sure that the Terminal Block Jumper is installed between the Ground Terminal and Terminal 8 on the output wiring block, as illustrated on page 9 of the User Manual. Please also make sure that the input voltage selector/switch is in the correct position.
The step-down transformer provides 240/120 output as 2 120v hots, a neutral, and a ground. It provides 208v output as a 120v hot, an 88v hot, and a ground. The 120v hot (terminal 7) and the 88v hot (terminal 9) are 180 degrees out of phase. You will measure 208v from terminals 7 to 9. The step-down transformer is not able to provide 2 120v hots that are 120 degrees out of phase as you would see with utility power.
Released for: Schneider Electric Egypt and North East Africa












Need help?
Product Selector
Quickly and easily find the right products and accessories for your applications.
Get a Quote
Start your sales enquiry online and an expert will connect with you.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Help Center
Find support resources for all your needs, in one place.