Littelfuse Introduces the New SMZ Series Stud Mount ZCASE Fuse Holder to the Commercial Vehicle Product Line

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0FHZ0201Z SMZ and 0FHZ0202Z SMZ Stud Mount Fuse Holders

CHICAGO, September 5, 2018 – Littelfuse, Inc., the global leader in circuit protection, today introduced the new Single Mount ZCASE (SMZ) Series Stud Mount Fuse Holder for the commercial vehicle industry. The SMZ is ideal for mounting directly to a stud style battery terminal or alternator stud.

The SMZ series accepts the Littelfuse proprietary ZCASE fuse that is available in 40-600A ratings with similar characteristics to the MEGA® fuse. The SMZ stud mount fuse holder is ideal for stacking to create a 2-pole version and is secured to a stud using a standard M8 or M10 nut. The insulated bolt on the busbar eliminates the traditional need for nylon nuts used on legacy CF8 fuses. The ZCASE fuses can be assembled using a standard M8 flange nut included with each part number. Geoff Schwartz, Business Development Manager, Commercial Vehicle Business Unit, at Littelfuse, said “The SMZ holder allows users to place circuit protection as close to the battery as possible while eliminating the need for wiring to a fuse holder and finding a mounting location for that fuse holder.  The high current line from the battery, battery disconnect switch or relay are amongst the highest current lines in a vehicle and frequently, they are not protected, now they easily can be.” 

The SMZ has the ability to stack up several holders allowing the user to protect lines to secondary fuse boxes and a line to a starter. Geoff added “The small footprint of the SMZ allows it to be placed to protect this line on any ¼” to M10 stud without any additional wiring.” The ZCASE fuse rating up to 600A allows fusing of high inrush current loads that previously could not be protected with a single stud fuse.  The SMZ fuse holder is available in four configurations, each with a red protective cover designed to reduce the risk of accidental contact on the fuse or battery terminal.

SMZ Series Stud Mount Fuse Holders offer many benefits including:

  • Mount directly to a stud style battery terminal or alternator stud
  • Mount directly to a battery switch or relay stud
  • Consolidate multiple fuse holders and reduce wiring
  • High amperage starter circuit protection

The SMZ Series Fuse Holders are available with either a 901-525 Fuse/Stud Cover or 901-524 Fuse Cover, providing protection and is designed to reduce the risk of accidental contact on the fuse or battery terminal. Sample requests may be placed through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit

For more information
Additional information is available on the SMZ Series Stud Mount Fuse Holder product page. For technical questions, please contact our technical support team at

About Littelfuse
Founded in 1927, Littelfuse is the global leader in circuit protection with advancing platforms in power control and sensor technologies. The company serves customers in the electronics, automotive and industrial markets with products that include fuses, semiconductors, polymers, ceramics, relays and sensors. Littelfuse has more than 11,000 employees in more than 50 locations worldwide. For more information, please visit