SIEMENS SITOR NH Fuse Link 3NA38246, Size NH00, 80 A, 690 V AC / 250 V DC, aR, Front Indicator

The 3NA38246 is a SITOR semiconductor fuse link in size NH00, rated for 80 A and built for DC and AC circuits up to 250 V DC and 690 V AC. Its aR operating class targets protection of power semiconductors, where fast interruption and current limitation prevent damage to diodes and thyristors. The front indicator gives a clear visual signal after operation, and the live grip lugs allow safe handling with standard NH fuse pullers.

Highlights

• Rated current 80 A, rated voltage 690 V AC / 250 V DC
• Operating class aR for semiconductor protection
• Size NH00 with front indicator and live grip lugs
• Breaking capacity 120 kA AC / 20 kA DC
• Ceramic body, compliant with IEC 60269-4

In daily use

The fuse link drops into standard NH00 fuse bases and is suitable for protecting rectifiers, inverters, and DC drives. Its low power loss of 10.5 W at rated current helps keep enclosure temperatures down. The front indicator shows a clear state change after a fault, reducing downtime during troubleshooting.

Full specifications

• Fuse type: NH fuse link
• Size: NH00
• Operating class: aR
• Rated current: 80 A
• Rated voltage AC: 690 V
• Rated voltage DC: 250 V
• Breaking capacity AC: 120 kA
• Breaking capacity DC: 20 kA
• Indicator: front indicator
• Contact design: live grip lugs
• Power loss: 10.5 W
• Standard: IEC 60269-4
• Mounting: fuse base
• Body material: ceramic
• Ambient temperature: -20 to +50 °C
• Series: SITOR
• Number of poles: 1
• Application: semiconductor and cable protection

Final note

The 3NA38246 is a reliable choice for protecting semiconductor devices in industrial power electronics, combining fast action with a compact NH00 footprint.