Technical FAQs

Ask a Question

What is Form FF4T11 on a 8538SDA34V81FF4T11?

This is actually three forms; Form ``F`` indicates the addition of one fuse in secondary circuit of control transformer. Form ``F4`` indicates the addition of two fuses in primary circuit of control transformer, wired such that the transformer is the only load on the fuses (required when Form ``T`` or ``T**`` is used per NEC). Form ``T11`` indicates addition of control transformer with 100VA additional capacity. See ``Control Circuit Forms`` of current Digest for additional options.


CTA-ID : 589
Was this helpful?
What can we do to improve the information ?