




The ZCASE® SMZ Series Bolt-Down Stud-Mount Fuse Holder reduces the need for wiring and parts by allowing ZCASE® high-current fuses to be directly installed on an alternator, battery switch, or electrical relay. Thanks to an insulated M8 or M10 stud on the busbar, the compatible fuse (sold separately) and output cable with a ring terminal (not included) can be assembled using the included standard nut.
The SMZ Series M8 ZCASE® fuse holder is available with an M6, M8, or M10 mounting hole to meet the requirements of various applications, and the M10 ZCASE® fuse holder features an M10 mounting hole. Various configurations, including with a protective cover for the fuse only, with a protective cover for the fuse and mounting stud, and without a cover, are available.
- Accepts high-current ZCASE® single bolt-down M8-size or M10-size fuses, depending on the model (fuses sold separately)
- Available mounting hole sizes include M6, M8, and M10
- Up to 3 SMZ Series fuse holders can be stacked to protect multiple circuits
- Space-saving design eliminates the need to wire in a separate fuse holder or power distribution module (PDM)
- Tin-plated copper busbar offers corrosion resistance
- Red UL 94 V-0–rated covers prevent accidental contact. One version covers just the fuse only, and the other covers the fuse and mounting stud.
- Total continuous current should not exceed 400 A per holder
ZCASE-SMZ Parts
Filters
Part Number | Actions | Mounting Method | Fuse Type | Current Rating Max (A) | Current Rating (Continuous) in Amps | Voltage Rating (V) | Temperature Maximum (°F) | Temperature Minimum (°F) | Temperature Maximum (°C) | Temperature Minimum (°C) | Recommended Torque | Ignition protection | Input Terminals | Output Terminals |
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Part Number | Actions | Mounting Method | Fuse Type | Current Rating Max (A) | Current Rating (Continuous) in Amps | Voltage Rating (V) | Temperature Maximum (°F) | Temperature Minimum (°F) | Temperature Maximum (°C) | Temperature Minimum (°C) | Recommended Torque | Ignition protection | Input Terminals | Output Terminals | |
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Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M8x1.25 SERRATED FLANGE NUT | |||||
Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M8 Stud Mount Hole | M8 Stud | ||||
Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M10 Stud Mount Hole | M10 Stud | ||||
Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M10 Stud Mount Hole | M10 Stud | ||||
Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M6 Stud Mount Hole | M8 Stud | ||||
Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M6 Stud Mount Hole | M8 Stud | ||||
Bolt Down | ZCASE | 400 | 300 | 32 | 221 | -40 | 105 | -40 | M8 Fuse Stud: 14Nm | M6 Stud Mount Hole | M8 Stud | ||||
ZCASE | 400 | 400 | 80 | 221 | -40 | 105 | -40 | 12-16 Nm | M10 | M8 | |||||
ZCASE-SMZ Applications
- Alternator, Battery Switch, or Electrical Relay Fusing
Series: ZCASE-SMZ Resources

Littelfuse-Commercial Vehicle Catalog
Find electronic components for trucks, buses, and construction, agricultural, marine, material handling, recreational, and marine vehicles.

Fuse Holder Brochure
Find solutions for securing, protecting, and connecting fuses used for overcurrent protection in passenger and commercial vehicles.

ZCASE SMZ Series Spotlight
Learn about the features and benefits of this fuse holder for battery protection fuses in the Littelfuse ZCASE line of overcurrent protection devices.

ZCASE-SMZ Instruction Sheet
Follow these instructions to correctly, safely, and securely mount the fuse holders on battery terminals.