Mersen D100QS Fast-Acting DC Fuse Series, 50-300A, 1000VDC aR

Mersen D100QS is a North American-style round-body high-speed fuse series for DC systems and high-power conversion protection. The family covers 50A through 300A at 1000VDC with an L/R time constant of ≤1ms and a 100kA interrupting rating, and is identified as aR. Mersen states that the series is designed to reduce I²t, peak let-through current, and arc voltage during fault conditions, while providing low watt losses, power-cycling capability, and vibration resistance. This Series Page consolidates the verified catalog variants so procurement teams can compare rated current, catalog ending, body diameter, full-current power dissipation, and minimum breaking capacity before RFQ or replacement review. D100QS Series Overview The D100QS range consists of fast-acting DC fuses for protection of high-power DC equipment. Mersen identifies the products as North American-style round-body fuses and lists both standard catalog endings and “-4Y” versions, with “-4Y” specifically designated for metric screws. The complete documented range extends from 50A to 300A. Technical Specifications Specification Series Data Utilization category aR Rated DC voltage 1000VDC Rated current range 50-300A Time constant L/R ≤1ms Interrupting rating 100kA Minimum breaking capacity Less than 3kA; exact tested value varies by rated current Body style North American-style round body Approvals / compliance UL Recognized, UL File E60314; REACH/RoHS compliant Technical data reference: Mersen D100QS Series aR 1000VDC Fast-Acting DC Fuses. D100QS Model Selection The D100QS range provides 13 current ratings from 50A through 300A across 23 verified catalog variants. Select the required rated current first, then verify the complete catalog ending; Mersen identifies “-4Y” catalog numbers as versions designated for metric screws. Body diameter changes across the 50-100A, 125-200A, and 225-300A groups, while full-current power dissipation and minimum breaking capacity also vary by rating. Confirm the complete MPN and electrical and mechanical requirements before replacement or ordering. Exact MPN Rated Current Catalog Ending Body Diameter B Power at In MBC at 1000VDC D100QS50-4 50A -4 1.00 in (25.4 mm) 10W 960A D100QS50-4Y 50A -4Y 1.00 in (25.4 mm) 10W 960A D100QS60-4 60A -4 1.00 in (25.4 mm) 12W 1160A D100QS60-4Y 60A -4Y 1.00 in (25.4 mm) 12W 1160A D100QS70-4 70A -4 1.00 in (25.4 mm) 15W 1350A D100QS70-4Y 70A -4Y 1.00 in (25.4 mm) 15W 1350A D100QS80-4 80A -4 1.00 in (25.4 mm) 18W 1540A D100QS80-4Y 80A -4Y 1.00 in (25.4 mm) 18W 1540A D100QS90-4 90A -4 1.00 in (25.4 mm) 20W 1730A D100QS90-4Y 90A -4Y 1.00 in (25.4 mm) 20W 1730A D100QS100-4 100A -4 1.00 in (25.4 mm) 24W 1920A D100QS100-4Y 100A -4Y 1.00 in (25.4 mm) 24W 1920A D100QS125-4 125A -4 1.22 in (31 mm) 22W 940A D100QS125-4Y 125A -4Y 1.22 in (31 mm) 22W 940A D100QS150-4 150A -4 1.22 in (31 mm) 29W 1130A D100QS150-4Y 150A -4Y 1.22 in (31 mm) 29W 1130A D100QS175-4 175A -4 1.22 in (31 mm) 35W 1320A D100QS175-4Y 175A -4Y 1.22 in (31 mm) 35W 1320A D100QS200-4 200A -4 1.22 in (31 mm) 41W 1510A D100QS200-4Y 200A -4Y 1.22 in (31 mm) 41W 1510A D100QS225-4 225A -4 1.50 in (38.1 mm) 37W 2200A D100QS250-4 250A -4 1.50 in (38.1 mm) 42W 2430A D100QS300-4 300A -4 1.50 in (38.1 mm) 53W 2920A Verified Applications Mersen lists the D100QS series for high-power battery charging and management-system protection, Energy Storage Systems (ESS), Electrical Energy Storage (EES), Battery Disconnect Units (BDU), battery-pack protection, DC fast-charging stations for EV applications, backup protection for DC relays, disconnectors and switches, and protection of UPS and inverter systems operating at 1000VDC or less. B2B Sourcing and Replacement Support Apexon Supply provides independent B2B sourcing and replacement-sourcing support for the Mersen D100QS series. Buyers should verify rated current, voltage, complete catalog number, screw designation, body dimensions, and protected-circuit requirements before specifying a replacement. Submit the complete MPN, selected rating, quantity, and application requirements for RFQ review and technical alignment.