Step Down Transformers

Keystone’s step down transformers are ideal for powering down from a 480 volt or 347 volt system to a 277 volt system, rated up to 375 watts. Utilizing a precision wound core and coil integrated design, these autotransformers provide a safe and reliable solution for effective power conversion to use standard 277 volt or multi-voltage lighting ballasts.

480-277V Transformers

Max Load Catalog Number Input Voltage Output Voltage Features Spec Sheet
30VA KTAT-30-480-277 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
30VA KTAT-30-480-277-RJS 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
70VA KTAT-70-480-277 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
70VA KTAT-70-480-277-RJS 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
250VA or 180VA KTAT-250-480-277 /A 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor Download
375VA or 270VA KTAT-375-480-277 /A 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor Download

347-277V Transformers

Max Load Catalog Number Input Voltage Output Voltage Features Spec Sheet
30VA KTAT-30-480-277 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
30VA KTAT-30-480-277-RJS 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
70VA KTAT-70-480-277 480V or 347V 277V Auto-transformer, fluorescent type form factor Download
70VA KTAT-70-480-277-RJS 480V or 347V 277V Auto-transformer, fluorescent type form factor Download

347-200V Transformers

Max Load Catalog Number Input Voltage Output Voltage Features Spec Sheet
250VA or 180VA KTAT-250-480-277 /A 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor Download
375VA or 270VA KTAT-375-480-277 /A 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor Download