Mersen D70QS250-4 D70QS Series High-Speed DC Fuse, 700VDC, 250A aR, 4.34in Round Body - Pack of 5

Overview: The Mersen D70QS250-4 is a North American style round-body high-speed semiconductor fuse from the D70QS Series. Rated 250 A at 700 VDC (L/R ≤1 ms) with a 20 kA DC interrupting rating, it provides rapid short-circuit protection for DC 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 DC IR
• aR characteristic optimized for semiconductor short-circuit protection
• Low I²t and low watts loss; superior cycling capability; vibration resistant
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 250 A, 700 VDC, L/R ≤1 ms, 20 kA IR
• Power dissipation: 7.4 W at 0.5×In
• Minimum Breaking Capacity (MBC): 1320 A at 700 VDC; maximum time to clear MBC: 140 ms
• Dimensions (225–400 A frame): A=4.34 in (110 mm), B=1.50 in (38.1 mm), C=2.09 in (53.1 mm), D=3.41 in (86.6 mm), E=2.78 in (70.6 mm), F=0.41 in (10.4 mm), G=1.00 in (25.4 mm), H=0.25 in (6.4 mm)
• Weight: 0.26 kg per fuse
• Mounting/accessories: compatible with P243C fuse blocks (D70QS 225–600 A) and 1SC/1MSC modular fuse blocks as listed in the catalog

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