Mersen D70QS450-4 D70QS Series High-Speed DC Fuse, 700VDC, 450A aR, 4.47in Round Body - Pack of 5

Overview: The Mersen D70QS450-4 is a North American style round-body high-speed semiconductor fuse from the D70QS Series. Rated 450 A at 700 VDC (L/R ≤1 ms) with a 20 kA interrupting rating, it delivers fast, reliable DC short-circuit protection for power electronics and battery-related systems. This item is sold as a pack of 5 units.

Key Features:

• 700 VDC rating with L/R ≤1 ms time constant
• High interrupting rating: 20 kA IR (DC)
• aR characteristic for semiconductor short-circuit protection
• Low I²t and low watts loss; superior cycling ability; vibration-resistant construction
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 450 A, 700 VDC, L/R ≤1 ms, 20 kA IR
• Power dissipation at 0.5×In: 12.4 W
• Minimum Breaking Capacity (MBC): 2200 A at 700 VDC; maximum time to clear MBC: 360 ms
• Dimensions (450–600 A frame): A=4.47 in (114 mm), B=2.00 in (50.8 mm), C=2.22 in (56.4 mm), D=3.53 in (89.7 mm), E=2.91 in (73.9 mm), F=0.41 in (10.4 mm), G=1.50 in (38.1 mm), H=0.25 in (6.4 mm)
• Weight: 0.52 kg per fuse
• Mounting/accessories: compatible with P243C fuse blocks (D70QS 225–600 A) and 1SC/1MSC modular fuse blocks (e.g., 1SC375/1SCM10)

Applications:

• Energy Storage Systems (ESS) and Battery Disconnect Units (BDU)
• Battery charging and management systems
• DC fast-charging stations and DC distribution
• Backup protection for DC relays/disconnectors/switches
• UPS and inverter protection up to 700 VDC