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Most mains-powered equipment requires three basic components at the power entry point: an inlet for connecting the power cord, a switch for turning the power on and off, and a fuse to protect against electrical faults. Traditionally, these components were installed separately on the equipment’s rear panel. A power entry module combines all three in a single housing.
This integrated design saves panel space, reduces internal wiring, and simplifies assembly. However, selecting the right module is important. Its electrical ratings, fuse configuration, mounting style, and terminal connections all need to match the equipment’s requirements.
This article compares three common power entry module configurations, covering their current ratings, fuse options, mounting methods, and wiring requirements. The LANZ Electronics C14+Fuse+Switch series provides the specifications used throughout the comparison.
In This Article
01How a Power Entry Module Works
A power entry module combines an IEC C14 power inlet with a fuse holder, a power switch, or both. In the LANZ Electronics C14 series, these components are housed in a single unit, providing a convenient way to connect AC power, protect against overcurrent, and control power to the equipment.
Combining these functions in one unit reduces the number of components needed, saves panel space, and simplifies installation. It also eliminates the need to mount and wire a separate fuse holder, helping manufacturers streamline assembly and reduce wiring errors.
02The Three Configurations
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The first configuration is an inlet with a fuse. The published description for the C14 inlet with fuse range covers an IEC 60320 C14 connector combined with an integrated fuse holder, rated for mains power up to 10 A at 250 VAC and using replaceable fuses.
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The second is an inlet with a switch. The module combines the C14 input with an integrated power switch, described as a rugged rocker or toggle switch, and it is aimed at industrial chassis and test equipment where an operator needs to cut power without reaching for the cord.
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The third is all three functions together. Versions of this module carry a single or a double fuse holder, and the switch may be a rocker or a toggle depending on the model. The published model list runs from a 10 A 250 V C14 inlet with fuse and switch, through a version with a double fuse and switch, to models with an illuminated rocker switch.
For equipment with a two-pin power inlet, LANZ Electronics offers a more compact option. The C8 with Switch and Fuse module combines an IEC 60320 C8 inlet, a rocker switch, and a fuse holder in a single housing, making it suitable for equipment where panel space is limited.
03Fuse Size, Rating, and the Line Conductor
The fuse holder is designed around a standard cartridge size. The snap-in version of the C14 inlet in this range accepts a 5×20 millimeter cartridge fuse, and the same fuse size appears in the C8 three-in-one module alongside its 15×21 millimeter rocker switch. Standardizing on 5×20 millimeter fuses matters for service, because a technician can replace one anywhere.
Current rating has to be read off the module rather than assumed. Published ratings in this range include 10 A at 250 VAC, and one model states a dual rating of 10 A and 15 A at 250 VAC. Where a module carries two fuses, both the load current and the equipment standard decide whether protection is applied to one pole or two.
Practical wiring for a single fuse holder puts the fuse in the line conductor, with neutral and, where present, protective earth carried through separately. The terminal arrangement and the safety requirements for the end product decide the final layout, and the current path from cord to module to internal wiring should be reviewed as one circuit.
04Terminals and Wiring
Terminal type decides how the module connects to the internal wiring. The published options for the snap-in C14 inlet are 4.8 millimeter and 6.3 millimeter quick-connect terminals, which lets a build use the same module with different cable lugs. For equipment assembled in volume, the LZ-14-F2 snap-in inlet is published with a push-fit structure that clips into the cutout without screws, which removes a step from every unit built.
05Snap-In vs. Screw-Mount Power Entry Modules
Mounting style affects both installation time and how securely the module fits into the equipment panel. Snap-in modules lock into a panel cutout without screws, making installation faster and reducing the number of parts needed. Screw-mount modules use a mounting flange and screws to provide a secure connection to the panel.
Snap-in mounting is a practical choice for high-volume production, especially when panel thickness and cutout dimensions are consistent. Screw-mount designs are better suited for heavier equipment, applications exposed to vibration, or installations where the module may need to be removed for maintenance.
LANZ Electronics offers both mounting options in its C14 power entry module range. The screw-mount LZ-14-F13 features an integrated fuse holder and power switch. It is designed for applications such as industrial equipment, test instruments, automation systems, medical devices, and 3D printers.
06Choosing a Power Entry Module for Class II Equipment
Class II equipment uses double or reinforced insulation instead of a protective earth connection. For these applications, a two-pin IEC C8 inlet is often a suitable choice.
LANZ Electronics’ C8 power entry module is designed for Class II appliances, including audio equipment, medical monitors, and smart home devices. It combines a power inlet, fuse holder, and switch in a compact housing, making it useful for equipment with limited rear-panel space.
The two-pin design eliminates the need for a protective earth connection, while the integrated fuse provides overcurrent protection. The equipment must still meet the applicable Class II insulation and safety requirements.
07What to Check Before Selecting a Power Entry Module
Start by checking the equipment’s voltage and current requirements. The LANZ C14 range includes models rated at 10A, 250VAC, with a 15A option available on certain models. Make sure the selected module, internal wiring, and fuse are rated appropriately for the application.
Next, check the fuse holder and terminal connections. The range includes 5 × 20 mm fuse holders and 4.8 mm or 6.3 mm quick-connect terminals. Choose a fuse with the appropriate current rating and characteristics for the equipment, and confirm that the terminals are compatible with the wiring.
Finally, consider the mounting method and inlet type. Snap-in modules simplify installation, while screw-mount versions provide a more secure mechanical connection. Choose between C14 and C8 based on the equipment’s electrical design, grounding requirements, and applicable safety standards.
08Conclusion
A power entry module brings the power inlet, fuse holder, and switch together in one compact unit, reducing panel space requirements, internal wiring, and assembly time.
When selecting a module, consider the inlet type, voltage and current ratings, fuse size, terminal connections, and mounting method. LANZ Electronics offers C14 power entry modules with 10A and 15A options at 250VAC, 5 × 20 mm fuse holders, and 4.8 mm or 6.3 mm quick-connect terminals, with snap-in and screw-mount configurations available.
Choosing the right module early in the design process helps simplify panel layout, ensure proper electrical connections, and make assembly and maintenance easier. For manufacturers, these benefits can translate into more consistent production and lower assembly costs.
