Power Entry Modules (PEM) are electromechanical components that are implemented within appliances and systems in order to integrate the appliance inlet with other components. In general, these components include switches, circuit breakers, fuse holders, voltage selectors, appliance outlets, and more. Power entry modules may be used to simplify the assembly process, or they may be used to benefit the product design.
Modules in general are apparatuses that combine multiple functions through a single unit so that power entry may be more easily governed. If functions were separated into individual systems, wiring issues and clutter may arise, causing problems with functionality and repair assy processes. Within the realm of information technology and medical applications, power entry modules help simplify equipment, also providing more protection and control over such appliances.
Through the use of a module, user safety is increased, reducing the possibility of various accidents. For one example, power entry modules may facilitate the disassembly of the power cord from the appliance before any changes are made. This decreases the chance of shock to the user working on the appliance in question, also allowing for easier access of differing parts and components. Simplifying the appliance as a whole also translates into reduced cost, ranging from both the direct materials and assembly process. With fewer components making up a machine, less testing and recording is needed for approvals, and assembly time is reduced to also save labor costs. Through the integration of various components into one, panel space is also saved, leading to a reduced mounting hold size and more room on the mounting surface.
Depending on your need, different modules may be chosen to fulfill various requirements. In general, the main functions of modules are circuit protection, voltage selection, filtering, switching, and providing power inlets and outlets. Inlets allow for the unit to receive electricity, accessing a power source through a cord set. Outlets also provide access to electrical power, and the amps of inlets and outlets may range. Switching on a module permits power to be turned on and off, and manufacturer manuals should be consulted for how to property install such switches.
Circuit protection on a given power entry module will come in the form of circuit breakers and fuses. Both types provide protection of sensitive components from current, mitigating the chance of short circuits. If the system or appliance is meant for use by multiple markets, fuses may be more preferable over circuit breakers due to their cost efficiency and ease of modification. Fuses are typically cheaper than circuit breakers, and they may come in a variety of shapes and sizes to accommodate specific applications. Circuit breakers, on the other hand, are based on their size and rating, and may limit an appliance to a specific set of applications.
A filter is an important facet of many power entry modulus, particularly in regards to medical equipment and applications that involve high frequencies. Filters can prevent certain frequencies from entering the system, protecting operation. Filters are typically composed of both inductors and capacitors, ranging in their implementation depending on the application in question. When used in medical systems, capacitors may be removed to prevent current leakage values from rising.
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