Mersen D70QS70-4 D70QS Series High-Speed DC Fuse, 700VDC, 70A aR 20kA IR, 3.63in Round Body - Pack of 5

Overview: The Mersen D70QS70-4 is a North American style round-body high-speed semiconductor fuse from the D70QS Series. Rated 70 A at 700 VDC (L/R ≤1 ms) with a 20 kA interrupting rating, it provides fast-acting 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
• 20 kA DC interrupting rating
• aR characteristic for semiconductor short-circuit protection
• Low I²t and low watts loss; superior cycling capability and vibration resistance
• UL Recognized (UL File E60314); REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 70 A, 700 VDC, L/R ≤1 ms, 20 kA IR
• Power dissipation: 2.2 W at 0.5×In
• Minimum Breaking Capacity (MBC): 540 A at 700 VDC; maximum time to clear MBC: 50 ms
• Dimensions (50–100 A frame): A=3.63 in (92.2 mm), B=1.00 in (25.4 mm), C=2.13 in (54.1 mm), D=2.94 in (74.7 mm), E=2.75 in (69.8 mm), F=0.31 in (7.9 mm), G=0.50 in (19 mm), H=0.13 in (3.2 mm)
• Weight: 99 g per fuse
• Mounting: “-4” termination style; compatible with 1SC/1MSC modular blocks up to 400 A

Applications:

• 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