Overview
The Ferraz Shawmut A50QS800-4 is a high-performance semiconductor protection fuse designed for modern power electronics. The A50QS Amp-Trap Form 101 fuses grew out of the need to improve the overall performance of semiconductor fuses in response to new equipment requirements. The A50QS encompasses the best protection features with lower I2t to provide better protection for equipment, longer life when subjected to cyclic loading and lower watts loss.
Key Features
- Lowest I2T for greatest protection of semiconductor circuits
- Form 101 fuse features a controlled arc voltage that helps in minimizing stress to circuit components during fuse clearing
- Ideal for the protection of dynamic solid state equipment such as motor drives, inverters, UPS
- Blade terminal, bolt-mount construction for secure installation
- UL recognized and CSA certified for industrial reliability
Technical Specifications
- Rated Current: 800A
- Voltage Rating: 500V AC / 500V DC
- Interrupt Rating (AC): 63 kA
- Fuse Type: Semiconductor, Fast-Acting
- Form: Form 101
- Mounting: Blade Terminal, Bolt-In
- Body Material: Fiber cylindrical cartridge
- Dimensions: 2.38″ diameter × 6.47″ length (60.45 × 164.34 mm)
- Weight: 2.4 lbs
- Approvals: UL, CSA, RoHS
Typical Applications
These fuses were developed for DC drives, uninterruptable power supplies and similar applications that require better protection, lower I2t as well as superior reliability. Common uses include:
- Variable frequency drives (VFDs)
- Soft starters and inverters
- Uninterruptible power supplies (UPS)
- High-current DC conversion circuits
- Power distribution systems requiring semiconductor protection
Compatibility & Replacements
Compatible With
- 500V AC/DC power systems rated 800A
- Drive and inverter circuit protection
- UPS and energy storage systems
- Standard 800A Form 101 fuse holders and clips
Replaces / Drop-In Replacement For
- Previous-generation A50P800-4 (Form 101 predecessor)
- Direct replacement for superseded A50QS semiconductor fuses
- Verify compatibility with your system integrator before ordering
Works With
- Form 101 blade-bolt fuse holders and cartridge clamps
- Any 500V AC or 500V DC power distribution equipment rated ≤800A
- Industrial motor control and power conversion systems
