Eti-Polam ZI 3 is an installation fuse holder designed for NH3-type fuses with a rated current of 630 A. It is intended for secure mounting and reliable retention of cylindrical NH3 fuses within electrical distribution and protection assemblies. The ZI 3 provides a stable electrical connection and facilitates safe insertion and removal of fuses during maintenance or replacement operations in industrial and commercial switchgear.
Advantages
The fuse holder offers mechanical stability and consistent contact pressure to support reliable current transfer and effective overcurrent protection. Constructed for compatibility with NH3 fuse geometry, it allows straightforward fuse replacement without complex tools and reduces downtime. Its design supports integration into standard panel and switchgear layouts, providing a predictable installation footprint and connection arrangement.
Suitable for
- Mounting NH3 cylindrical fuses rated up to 630 A in distribution panels and switchboards
- Industrial and commercial electrical protection circuits where high-current fuse links are used
- Applications requiring secure, easy-to-replace fuse containment in motor control centers, substations, and service panels
When it may not be suitable
This fuse holder is specific to NH3-type cylindrical fuses and to systems that accommodate its physical dimensions and rated current. It is not suitable for use with other fuse form-factors (for example, blade or cartridge types with different geometries) or in installations where the required rated current is significantly lower or higher than 630 A.
Key specifications
- Compatible fuse type: NH3 cylindrical fuses
- Rated continuous current: 630 A
- Function: mechanical retention and electrical contact for overcurrent protection
- Intended installation: switchgear, distribution panels, industrial and commercial electrical cabinets
How to use
Install the fuse holder into the designated panel or switchgear mounting position following the equipment manufacturer’s mounting layout and torque specifications for terminal connections. Insert the NH3 fuse into the holder until secure contact is achieved; verify firm mechanical seating and proper electrical continuity according to test procedures. For replacement, isolate the circuit, ensure no residual voltage is present, withdraw the fuse and fit a correctly rated NH3 fuse of matching dimensions, confirming correct orientation and secure seating before re-energising.
What to consider before purchase
- Confirm compatibility with NH3 fuse dimensions and the 630 A rated current
- Verify the physical mounting space and panel cut-out or holder footprint in your switchgear
- Ensure terminal type and conductor sizes match the installation’s cabling and torque requirements
Usage recommendations
Use the fuse holder only with NH3-type fuses of the correct rating and dimensions, follow local electrical codes and safety practices when installing or replacing fuses, and perform isolation and voltage checks before any maintenance. Periodic inspection of contact condition and mechanical fixation helps maintain reliable operation.
