The ABB HTSS252050CN is a back-up current-limiting fuse for distribution transformers, rated 23.0 kV and 50 A. It is applied in series with a properly sized under-oil expulsion fuse (bay-o-net, load-sensing link or weak link): the expulsion fuse clears low-magnitude faults while the current-limiting fuse interrupts high fault currents and limits the let-through energy below the withstand capability of the transformer tank.
- Voltage rating: 23.0 kV
- Current rating: 50 A
- Rated maximum voltage: 25.5 kV
- Rated maximum interrupting current: 50.0 kA
- Minimum interrupting current: 570 A
- Peak arc voltage: 71 kV
- Minimum melting I²t: 3200 A²s
- Maximum total I²t: 20000 A²s
- Overall diameter: 55.9 mm
- Overall length: 317.5 mm
- Body length: 287.0 mm
- Weight: 1.48 kg
The CN suffix marks units manufactured in China. The same rating is also available without the suffix, manufactured outside China.
Technical Specifications
- Part Number
- HTSS252050CN
- Manufacturer Part Number
- HTSS252050CN
- Series
- HTSS Series
- Fuse Type
- Backup current-limiting fuse
- Current Rating
- 50 A
- Voltage Rating
- 23.0 kV
- AC / DC
- AC
- Breaking Capacity
- 50.0 kA
- Pre-arcing I²t
- 3200
- Total I²t
- 20000
- Package / Dimensions
- 55.9 mm dia. x 317.5 mm overall length (287.0 mm body)
- Application
- Transformer
- Weight
- 1.48 kg
- Approvals
- IEEE C37.40
- Certifications
- IEEE C37.40
- Rated maximum voltage
- 25.5 kV; Rated maximum interrupting current: 50.0 kA; Minimum interrupting current: 570 A; Peak arc voltage: 71 kV; Manufactured in China