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Approvals & Standards

  • IEC 60269-4 Compliance in AC and DC voltage
  • UL/CSA Recognized E76491 in AC and DC voltage
  • CCC GB 1539.4

Key features & benefits

The 690/760V Protistor® SC Series is a specific range to offer cost effective protection without concession on performance for
power conversion equipment. These fuses have been engineered to provide protection for all semiconductors: diodes, thyristors and
IGBT devices. They are assembled with bimetal silver and copper elements embedded in solidified sand, which helps control arcing
characteristics for a lower I²t and high interrupting rating level.
Contact surfaces are tin plated to get an optimized interface with the best quality/price ratio.
This SC Series has been conceived and specially optimized to match integrators’ and equipment manufaturers’ main requirements while
offering competitive prices.

More specifications


  • Protection of standard power conversion systems such as low voltage drives, UPS, inverter systems and similar
  • All AC standard networks (up to 690V) or DC standard networks

Product Specifications

Item number


Catalogue No.


Short Description

Size 31 type TTF without indicator aR 350 A 690VAC  



Rated voltage AC UL

760   V

Rated voltage DC UL

600   V

Rated voltage AC IEC

690   V

Ampere Rating

350   A



Fuse Size




Clearing I2t At Rated Voltage

65   kA²s

Melting I2t

10.3   kA²s

AC Max I.R./Breaking Capacity: I1

200   kA

Power Dissipation at Rated Current Value

74   W

Connection/Terminal Material

Silver-Plated Brass  

Connection/Terminal Type

End Contact with Threaded Holes  

Body/Insulating Material


Product Weight

0.75   lb

Product Width

2.01   in

Product Length

1.99   in

Product Height

2.22   in

Sell Pack Quantity

12   EACH

Sell Pack Weight

8.995   lb

Sell Pack Width

5.91   in

Sell Pack Length

14.57   in

Sell Pack Height

3.15   in