DC 500V / AC 690V Class 1E Nuclear-Grade Fuse

Class 1E nuclear-grade low-voltage fuse from the NSRD5.0 series, designed for passive nuclear power plant electrical systems
Rated voltage: DC 500V / AC 690V | Rated current: 800A – 2,000A
Rated breaking capacity: 50 kA @ 500V DC / 200 kA @ 690V AC | Protection category: gD
Full-range current interruption capability — withstands normal load, disconnects on fault, and safely interrupts maximum short-circuit current
Compliant with IEC 60269, GB 13539, and UL 248 standards

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Key Features:

Part of the NSRD5.0 series (NSRCC5.0 / NSRD5.0 / NSRN5.0) — a specialized low-voltage fuse range developed specifically for nuclear power plant safety-critical applications
Class 1E rated — provides safety-level circuit protection for electrical systems in passive nuclear power plants in accordance with nuclear industry requirements
Dual voltage rating: DC 500V and AC 690V, covering a broad range of nuclear facility power distribution needs
Wide current range of 800A to 2,000A to accommodate high-capacity nuclear plant power systems
Asymmetric breaking capacity — 50 kA at 500V DC and 200 kA at 690V AC — ensuring reliable fault interruption across both DC and AC systems
gD protection category — general-purpose fuse with full-range breaking capability for distribution circuits
Three critical performance requirements met: sustained normal load operation, guaranteed disconnection upon fault current occurrence, and safe interruption of maximum system short-circuit current
Low I²t value for minimized thermal stress on downstream equipment during fault events
Rated current range across the full series spans 0.5A to 2,000A for broad system compatibility
Compliant with IEC 60269, GB 13539, and UL 248 standards
REACH declaration available upon request; RoHS compliant

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