Overview
The Eaton Bussmann KAB-30 is a Tron series high-speed rectifier fuse rated at 30A, 250VAC. This cartridge-style fuse is engineered for semiconductor protection applications where fast-acting response to overcurrent conditions is critical. The center-bolted design accommodates standard rectifier fuse holders and clip mounts commonly found in industrial control panels, power distribution equipment, and semiconductor-based drives.
Key Features
- Fast-blow characteristic — Rapid response to overcurrent for precise semiconductor protection
- 30A current rating — Standard amperage for mid-range rectifier circuits
- 250VAC voltage rating — Suitable for single-phase and rectified DC applications
- Cartridge form factor — 9/16 inch diameter × 2 inch length; compatible with standard fuse holders and clips
- UL listed — Meets safety and performance standards for industrial use
- Center-bolted design — Easy insertion and secure mounting in rectifier fuse blocks
Technical Specifications
Detailed specifications for the KAB-30 rectifier fuse:
| Parameter | Value |
| Manufacturer | Eaton Bussmann |
| Part Number | KAB-30 |
| Current Rating | 30A |
| Voltage Rating | 250VAC |
| Fuse Type | Rectifier, Fast-Blow |
| Dimensions | 9/16 in. diameter × 2 in. length (10.3 × 38.1 mm) |
| Form Factor | Cartridge (Center-Bolted) |
| Speed Class | aR (Fast Acting, Semiconductor Class) |
| Approvals | UL Listed |
| Series | Tron KAB |
Typical Applications
- Rectifier circuits — Protects AC-to-DC conversion stages in power supplies
- Semiconductor drives — Safeguards diode and thyristor components in variable frequency drives (VFDs) and soft starters
- Industrial power distribution — Overcurrent protection in control panel rectifier banks
- DC power supplies — Protects bridge rectifier and smoothing circuits in industrial equipment
- Motor control circuits — Used in soft-start and DC motor controller rectification stages
Compatibility & Replacements
Compatible With
- Standard rectifier fuse holders with center-bolt mounting
- Clip-mount fuse blocks and cartridge holders
- Industrial control panels rated for 250VAC
- Eaton Bussmann KAB series fuse block assemblies
- Legacy and modern rectifier circuit designs requiring 30A, 250VAC protection
Replaces / Drop-In Replacement For
- Cooper Bussmann KAB-30
- Eaton KAB-30 (legacy variant)
- Other 30A, 250VAC fast-blow rectifier fuses with equivalent cartridge dimensions
Works With
- Eaton Bussmann rectifier fuse block assemblies
- Standard industrial 250VAC DC bus rectification systems
- Siemens, Allen-Bradley, Mitsubishi, and other industrial drives with integral rectifier stages
- Power factor correction (PFC) circuits in modern variable frequency drives
- Any industrial application requiring fast-acting semiconductor-class overcurrent protection
