Recent News


February 19, 2024

Volume 12 | February 2024

Innovative Fuse Products from Keystone


"Auto" Blade Fuse Holders


Our full line of Auto Blade Fuse Holders are Pre-Assembled for easy mounting and soldering to PCB’s to accommodate Mini, LP Mini, Standard and Maxi automotive blade fuses.


Features include:


• Mini sizes: Compatible with Littelfuse ATO 297 series and Bussman ATM series automotive blade fuses. Suitable for up to 20 Ampere applications

?• LP Mini sizes: Compatible with Littelfuse 0891 series and Bussman Low Profile ATM series automotive blade fuses. Suitable for up to 20 Ampere applications

• Standard sizes: Compatible with Littelfuse ATO 257 series and Bussman ATC series automotive blade fuses.  Suitable for up to 30 Ampere applications

• Maxi sizes: Compatible with Littelfuse MAXI series, APX and Bussman MAX series automotive blade fuses. Suitable for up to 40 Ampere applications

• 2 in 1 fuse holder is also available to accommodate both Standard and Low Profile Mini style Automotive Blade Fuses

• Available in Thru Hole Mount (THM) or Surface Mount

(SMT) configurations

?• Colored Insulator bases are available to match the colors of auto blade fuses for enhanced identification

• Available in Bulk or on Tape & Reel

• Compatible with all wave and reflow operations and compatible with all vacuum and mechanical pick & place assembly systems



Click here to learn more about all our Auto Blade fuse holders

Solar Protection Fuse (SPF) Products


Keystone offers a broad assortment of PCB Mounted Fuse Holders and Clips which include a series intended specifically for photovoltaic (PV) systems. 


The fuse holders are exclusively designed to accommodate the family 5AG, midget fuses (10x38mm) in the SPF Solar Protection Fuse series.


Rated for up to 30 Amps, 500 VDC operation and UL Recognized, these holders and clips, in conjunction with the SPF fuses, are a cost-effective solution to safely protect PV modules and their conductors from reverse overcurrent conditions. 


Keystone's holders are manufactured to protect and insulate SPF fuses Designed with a high temperature, UL 94V-0 Nylon base with Tin Plated Brass contacts for superior life. Keystone offers an optional cover for the holder to provide additional protection for the fuse while in the holder. The stand-alone clips are also available for development of a PV system circuit.


Cat. # 3574 - Surface Mount SPF Holder

Cat. # 3576 - Thru Hole Mount SPF Holder

Cat. # 3576C - Cover for SPF Fuse Holders


Cat. # 3566 - Thru Hole Mount SPF Clip


Click here to learn more about our Solar Protection Fuse Holders


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