Mersen D100QS300-4 D100QS Series High-Speed DC Fuse, 1000VDC, 300A aR 100kA IR, Round Body 5.09in - Pack of 5

Overview: The Mersen D100QS300-4 is a North American round-body high-speed semiconductor fuse from the D100QS Series. Rated 300 A at 1000 VDC (L/R ≤1 ms) with a 100 kA interrupting rating, it provides low I²t and low watts loss for robust DC protection in power conversion and battery-related systems. This item is sold as a pack of 5 units.

Key Features:

• 1000 VDC rating, L/R ≤1 ms time constant
• High interrupting rating: 100 kA IR (DC)
• aR characteristic for semiconductor short-circuit protection
• Lower I²t and low watts loss; superior cycling capability
• Built to withstand vibration
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Ratings: 300 A, 1000 VDC, L/R ≤1 ms, 100 kA IR
• Minimum Breaking Capacity (MBC): 2920 A at 1000 VDC; max time to clear MBC: 80 ms
• Power dissipation: 29 W at 0.8×In; 53 W at In
• Dimensions (D100QS225–300 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: Series MBC < 3 kA; “-4Y” variants designate metric screws
• Mounting/accessories: compatible with P266A fuse blocks (1000 V, D100QS 225–300 A) and 1SC/1MSC modular blocks (e.g., 1SC375, 1SCM10)

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