Mersen D70QS50-4 D70QS Series High-Speed DC Fuse, 700VDC, 50A aR 20kA IR, 3.63in Round Body - Pack of 5

Overview: The Mersen D70QS50-4 is a North American style round-body high-speed semiconductor fuse from the D70QS Series. Rated 50 A at 700 VDC with L/R ≤1 ms and 20 kA interrupting rating, it is engineered for DC power conversion and battery-related protection. This item is sold as a pack of 5 units.

Key Features:

• 700 VDC rating for DC systems with L/R ≤1 ms
• High interrupting rating: 20 kA IR (DC)
• aR characteristic for semiconductor short-circuit protection
• Low I²t with low watts losses; superior cycling capability
• UL Recognized (UL File E60314); REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 50 A, 700 VDC, L/R ≤1 ms, 20 kA IR
• Power dissipation: 1.4 W at 0.5×In
• Minimum Breaking Capacity (MBC): 380 A at 700 VDC; max time to clear MBC: 50 ms
• Dimensions (D70QS 50–100 frame): A=3.63 in (92.2 mm), B=1.00 in (25.4 mm), C=2.13 in (54.1 mm), D=2.94 in (74.7 mm), E=2.75 in (69.8 mm), F=0.31 in (7.9 mm), G=0.50 in (19 mm), H=0.13 in (3.2 mm)
• Weight: 99 g per fuse
• Notes: Catalog suffix “-4” mounting; series L/R ≤1 ms

Applications:

• High-power battery charging and management systems
• Energy Storage Systems (ESS) and Battery Disconnect Units (BDU)
• DC fast-charging stations and DC grids
• Backup protection for DC relays/disconnectors/switches
• Protection of UPS and inverters up to 700 VDC