Mersen D100QS125-4 D100QS Series High-Speed DC Fuse, 1000VDC, 125A aR, Round Body 4.38in - Pack of 5

Overview: The Mersen D100QS125-4 is a North American round-body high-speed semiconductor fuse from the D100QS Series, rated 125 A at 1000 VDC with L/R ≤1 ms and 100 kA interrupting rating. This item is sold as a pack of 5 units. It offers low I²t and watts loss with robust cycling and vibration resistance for reliable DC protection in battery, ESS, UPS, inverter, and DC switching applications.

Key Features:

• 1000 VDC rating (L/R ≤1 ms) with 100 kA IR
• aR characteristic for semiconductor short-circuit protection
• Lower I²t and low watts loss for improved device protection
• Superior cycling capability; vibration resistant construction
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Electrical: 125 A, 1000 VDC, L/R ≤1 ms, 100 kA IR
• Minimum Breaking Capacity (MBC): 940 A at 1000 VDC; max time to clear: 80 ms
• Power dissipation: 12 W at 0.8×In; 22 W at In
• Dimensions (D100QS125–200 frame): A=4.38 in (111 mm), B=1.22 in (31 mm), C=2.88 in (73 mm), D=3.69 in (93.6 mm), E=3.56 in (90.5 mm), F=0.31 in (7.9 mm), G=1.00 in (25.4 mm), H=0.19 in (4.8 mm)
• Weight: 0.19 kg per fuse
• Notes: Suffix “-4Y” designates metric screws; series MBC <3 kA

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