Mersen D70QS500-4 D70QS Series High-Speed DC Fuse, 700VDC, 500A aR 20kA IR, 4.47in Round Body - Pack of 5

Overview: The Mersen D70QS500-4 is a North American style round-body high-speed semiconductor fuse from the D70QS Series. Rated 500 A at 700 VDC (L/R ≤1 ms) with a 20 kA DC interrupting rating, it provides rapid short-circuit protection for DC power electronics, ESS/BDU, and UPS/inverter applications. 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 optimized for semiconductor short-circuit protection
• Low I²t and low watts losses; superior cycling capability and vibration resistance
• UL Recognized; REACH/RoHS compliant

Technical Specifications:

• Electrical ratings: 500 A, 700 VDC, L/R ≤1 ms, 20 kA IR
• Power dissipation: 13.9 W at 0.5×In
• Minimum Breaking Capacity (MBC): 2460 A at 700 VDC; maximum time to clear MBC: 360 ms
• Dimensions (450–600 A frame): A=4.47 in (114 mm), B=2.00 in (50.8 mm), C=2.22 in (56.4 mm), D=3.53 in (89.7 mm), E=2.91 in (73.9 mm), F=0.41 in (10.4 mm), G=1.50 in (38.1 mm), H=0.25 in (6.4 mm)
• Weight: 0.52 kg per fuse
• Mounting/accessories: compatible with P243C fuse blocks (D70QS 225–600 A) and 1SC/1MSC modular fuse blocks (e.g., 1SC375/1SCM10 for 450–600 A)

Applications:

• Energy Storage Systems (ESS) and Battery Disconnect Units (BDU)
• Battery charging and management systems
• DC fast‑charging stations and DC distribution
• Backup protection for DC relays/disconnectors/switches
• UPS and inverter protection up to 700 VDC