RBA
The RBA Fuse is a vented electromechanical device designed for many different power applications. It is most effective for higher operational voltage and higher continuous current requirements. The RBA expulsion type fuse, not unlike other similar devices, does not limit the magnitude of fault current during operation. It limits the duration of the fault on the electrical system. The BA fuse predates the RBA and many styles are available.
Features
- Offer continuous current ratings of through 720 amperes, maximum voltages of 8.3 through 38kV, and symmetrical interrupting capabilities of 19,000 through 37,500 amperes.
- Two operating time configurations, standard speed and time lag (delay).
- Can be used with either disconnect or non-disconnect mountings.
- Designed for indoor or weatherproof enclosure applications.
- The RBA is a renewable (refillable) design. For this reason, RBA fuses provide an economical approach to the protection of distribution system equipment rated up to a maximum of 38 kV.
Applications
- Load Interrupter Switchgear
- Power Transformers
- High Voltage Capacitors
- Pad Mounted Transformers
Definitions
- RBA: Refillable Boric Acid
- Refillable: The entire fuse unit is not discarded after it interrupts a fault. Usually only one portion of the fuse is replaced after an interruption.
- RBA Holder: glass epoxy tube, which encloses and supports the fuse refill.
- Spring and shunt assembly: puts the arcing rod under tension providing the required force to move it inside the refill up into the boric acid liner.
- Condenser: attaches to the bottom of the holder and fully restricts the expulsion process thus reducing the interrupting rating. Used in small clearance areas to minimize noise and exhaust.
- Discharge Filter: same as condenser but does not reduce the interrupting rating of the fuse.
- "E" rated fuses operate as follows: 100E or less must melt in 300 seconds (5 minutes) at 200 to 240% of E (ampere) rating. Over 100E must melt in 600 seconds (10 minutes) at 220 to 264% of E (ampere) rating. Example A 100E fuse must melt in 300 seconds with an applied current of 200 to 240 amperes.
Brands:
- Eaton Cutler-Hammer Westinghouse
Data Sheet:
