Description
EATON Expulsion Fuse Refill Unit, Type BA4, 400E, 7.2 kV, Specifications: Class E, 8.3 kV Maximum Voltage, Glass Epoxy
Features:
- The refillable BA-type (boric acid) high voltage expulsion fuse is an E-rated fuse that can be vented (outdoor) or enclosed (indoor)
- DE-ION® arc interruption permits application of the BA-type power fuse over a range of system voltages
- This line of dropout fuses carries the boric acid principle of circuit protection to higher voltage ratings
- Main operating parts are the fusible element, arcing rod, helical spring and dry boric acid cylinder
- To prevent warping under outdoor conditions, a heavy glass epoxy or ceramic tube encloses the entire assembly
- This glass epoxy tube also assures adequate strength to contain the force of the arc interruption
- Within the fuse, the current path is maintained by tight electrical connections
- From the top ferrule, the path is through the extended spring and shunt assembly
- When the fuse element melts, the arcing rod is pulled upward drawing the arc into the boric acid cylinder
- As It strikes, intense heat from the arc decomposes the compressed boric acid powder
- Decomposition of the dry boric acid forms water vapor and boric acid anhydride
- The electrical interruption is caused by the steam cooling and de-ionizing the arc as it is drawn through the cylinder by the action of the spring and rod
- When a fuse operates due to a fault blown, the fuse holder is removed with from the mounting
- After replacement of the refill unit, the fuse holder can be reinserted into the fuse mounting
Applications:
Utility and Industrial High Voltage Power System Applications
Standards/Approval:
