Overview
The Westinghouse 38RBA4-10E expulsion fuse refill is a Type RBA4 medium-voltage fuse designed for industrial and utility distribution systems. Rated at 38 kV maximum (35 kV nominal) with a 10E ampere capacity, this refill unit provides standard-speed overcurrent protection meeting IEEE Std. C37.41 specifications. The RBA-400 series is engineered for reliability in challenging indoor and outdoor electrical environments where precision fuse coordination is essential.
Key Features
- Type RBA4 expulsion fuse refill for 38 kV maximum voltage rating
- 10E ampere Class E rating for precise overcurrent protection
- Single barrel design compatible with RBA fuseholders
- IEEE Std. C37.41 certified for standards compliance
- Standard-speed operation suitable for medium-voltage circuits
- Designed for use in indoor and outdoor installations
Technical Specifications
- Voltage Rating (Max): 38 kV
- Voltage Rating (Nominal): 35 kV
- Current Rating: 10E amperes
- Fuse Type: Expulsion Fuse Refill
- Series: RBA-400 (Type RBA4)
- Class: Class E
- Design: Single barrel
- Speed: Standard-speed
- Certification: IEEE Std. C37.41
- Interrupt Rating: 16.8 kA at 34.5 kV
Typical Applications
The 38RBA4-10E is commonly used in:
- Medium-voltage distribution transformers and circuits
- Utility substation feeder protection
- Industrial power distribution systems
- Equipment protection requiring selective coordination
- Circuits where standard-speed fuse response is required
Compatibility & Replacements
Compatible With
- RBA fuseholders and mounting equipment rated for 38 kV
- RDB fuseholders (for RBA refills)
- Medium-voltage distribution systems operating at 35–38 kV
- Equipment designed for Class E protection standards
Replaces / Drop-In Replacement For
The 38RBA4-10E is a direct refill replacement for existing RBA-400 housings in 38 kV circuits previously protected by failed or blown units of equivalent rating. Verify compatibility with your system integrator before ordering to ensure fuseholder type matches.
Works With
- IEEE C37.41 compliant distribution systems
- Standard-speed fuse coordination schemes
- Medium-voltage switchgear and substations
- Utility and industrial electrical protection networks
