![]() We’ve looked at various purposes for including switching capabilities in a power distribution unit. The combination of circuit and outlet switching can be designed to optimize fixed workflow or procedure requirements, or maximize general purpose flexibility. Options include a dedicated breaker or mechanical switch on the PDU, or an electrical relay driven by a remote switch or by remote software signals across an Ethernet network. Switching of power at individual outlets is also a common feature whether for a select few outlets, or for every outlet in the PDU. This is typically a convenience feature to provide power to specific branches or circuits when needed, perhaps to enable a shutdown of related equipment for maintenance. A simple switch or circuit breaker can provide that separation of control. These outlets may require separate on/off control as a group without affecting other circuits in the PDU. A branch, or circuit, is a subset of power outlets which share a common power source point within the PDU. Is the switching on or off of power distribution branches. ![]() This partial view of an application-specific PDU control panel shows an EPO button, circuit breakers, and circuit control switches. Depending on the application, the switching can be performed by a mechanical relay, or may require a solid-state relay where a much faster transfer time is critical to prevent equipment shutdown.Ī common control requirement in a PDU ( Fig. The ATS circuit detects the loss of power on source A and switches to source B. However, many types of equipment do not include this, and need an external device to do that switching for them.Īn automatic transfer switch (ATS) provides this power control capability. Some equipment, such as computer servers, have the internal ability to connect to two sources and use either one. The loss of one power source would automatically result in the use of the other. In applications where 100% power availability is critical, it is common to have two completely separate power sources. These buttons are intended to be easy to find and press in an emergency or “panic” scenario, such as when a person has identified a hazardous condition not automatically handled by the equipment itself. An EPO is a large, prominently placed push button used to disconnect power to all circuits and thus all devices connected to the PDU. In some applications, particularly those with machinery connected to the PDU, an Emergency Power Off (EPO) may be required. These devices include a variety of fuses and circuit breakers designed to handle characteristics of various types of current load. ![]() ![]() A circuit protection device is used to detect an overload condition and automatically disengage the power source. Hardware failures can cause excessive load in that equipment and in the PDU, either of which can lead to several hazardous conditions including fire. With any electrical system, each component has a maximum energy capacity. Switches, breakers, remote signals across Ethernet and automated switching between power sources are all important considerations. ![]() Selecting the right solution to optimize the distribution of power to the connected loads is imperative for maximum system uptime. ![]()
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