Mersen D100QS250-4 D100QS Series High-Speed DC Fuse, 1000VDC, 250A aR, 5.09in Round Body - Pack of 5

Overview: The Mersen D100QS250-4 is a North American round-body high-speed semiconductor fuse from the D100QS Series. Rated 250 A at 1000 VDC with L/R ≤1 ms and a 100 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:

• 1000 VDC rating for DC systems with L/R ≤1 ms
• High interrupting rating: 100 kA IR (DC)
• aR characteristic for semiconductor short-circuit protection
• Low I²t with low watts losses
• Superior cycling capability; vibration resistant
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 250 A, 1000 VDC, L/R ≤1 ms, 100 kA IR
• Minimum Breaking Capacity (MBC): 2430 A at 1000 VDC; max time to clear MBC: 80 ms
• Power dissipation: 23 W at 0.8×In; 42 W at In
• Dimensions (225–300 A frame): A=5.09 in (129 mm), B=1.50 in (38.1 mm), C=2.84 in (72.2 mm), D=4.16 in (106 mm), E=3.53 in (89.7 mm), F=0.40 in (10.2 mm), G=1.00 in (25.4 mm), H=0.25 in (6.4 mm)
• Weight: 0.30 kg per fuse
• Notes: Catalog numbers ending “-4Y” are for metric screws; series MBC <3 kA
• Compatible accessories: P266A fuse blocks (1000 V) and 1SC/1MSC modular blocks for 225–300 A frames

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 1000 VDC