What do the letters F, FB, H, HB or HF designate in SquareD/Schneider Electric Transformer catalog numbers?

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Issue:
Temperature rise suffixes on Low Voltage Transformers

Product Line:
LV Transformers

Environment:
Products sold in North America

Cause:
Low Voltage Transformers have different insulation systems and temperature rise classifications

Resolution:
1. An F Suffix designates Class 180 insulation system with 115 deg C average temperature rise in the windings
2. An FB Suffix designates Class 180 insulation system with 80 deg C average temperature rise in the windings
3. An H Suffix designates Class 220 insulation system with 150 deg C average temperature rise in the windings
4. An HF suffix designates Class 220 insulation system with 115 deg C average temperature rise in the windings.
5. An HB suffix designates Class 220 insulation system with 80 deg C average temperature rise in the windings.

Insulation system is also often referred to as Insulation Class.