Mersen D70QS175-4 D70QS Series High-Speed DC Fuse, 700VDC 175A aR, 20kA IR, 3.63in Round Body - Pack of 5

Overview: The Mersen D70QS175-4 is a North American style round-body high-speed semiconductor fuse from the D70QS Series. Rated 175 A at 700 VDC with L/R ≤1 ms and a 20 kA interrupting rating, it delivers 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 and vibration resistance
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 175 A, 700 VDC, L/R ≤1 ms, 20 kA IR
• Power dissipation: 5.2 W at 0.5×In
• Minimum Breaking Capacity (MBC): 1210 A at 700 VDC; maximum time to clear MBC: 60 ms
• Dimensions (D70QS 125–200 frame): A=3.63 in (92.2 mm), B=1.22 in (31 mm), C=2.13 in (54.1 mm), D=2.94 in (74.7 mm), E=2.81 in (71.4 mm), F=0.31 in (7.9 mm), G=1.00 in (25.4 mm), H=0.19 in (4.8 mm)
• Weight: 0.17 kg per fuse
• Mounting/accessories: compatible with 1SC/1MSC modular fuse blocks up to 400 A (see catalog); “-4” termination style

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