A50QS250-4 SEMICONDUCTOR FUSE 250A

Description

The A50QS250-4 is a high-speed semiconductor protection fuse designed for ultra-fast interruption of fault currents in power electronics systems. It is engineered to protect sensitive components such as IGBTs, SCRs, rectifiers, and drives by limiting let-through energy and preventing damage during short-circuit conditions. It is widely used in industrial drives, UPS systems, inverters, and power conversion equipment.

Key Features

• 250A high-speed semiconductor fuse
• Rated up to 500V AC / DC systems
• Ultra-fast acting (aR class protection)
• Extremely low I²t for superior semiconductor protection
• High interrupting capacity for fault safety
• Designed for IGBT, SCR, and power diode protection
• Low power loss and reduced heating
• Bolt-on blade (Form 101) construction
• Excellent cycling performance under load variations
• Industrial-grade reliability for harsh environments

Specifications

1. Product Type: Semiconductor Protection Fuse (High-Speed Fuse)
2. Model Number: A50QS250-4
3. Rated Current: 250A
4. Rated Voltage: 500V AC / 500V DC
5. Fuse Class: aR (Ultra-fast semiconductor protection)
6. Breaking Capacity: Up to 200 kA AC (typical range)
7. DC Interrupt Rating: ~87 kA (typical)
8. Mounting Type: Bolt-on/blade type (Form 101)
9. Connection Type: Bolted terminal/blade contact
10. Body Size: Approx. 38.1 × 110 mm
11. Material: Ceramic body with high-strength insulating housing
12. Element Type: Silver alloy fuse element (high-speed design)
13. Operating Temperature: -40°C to +125°C
14. Standards: UL recognised, CSA certified (varies by variant)
15. Application: VFD drives, UPS systems, inverters, rectifiers, motor drives, DC power systems, industrial power electronics protection