March 29, 2024

Difference between PDU and overload protector

The full name of the overload protector is called "thermal thermal overload protector". As its name suggests, thermal energy is when the current is too large, it will have a preheating temperature rise, generate kinetic energy, and cut off the power. Its working state is that, when the current is overloaded, the protector button will quickly bounce off and cut off the power. After removing the overload, press the button to turn on the power and normal protection status can be restored. The advantage of this device is that it does not need to replace the fuse (or fuse), can be reused, and is very convenient. The protection of the thermal energy overload protector is to prevent the temperature from rising after the current is too large, and the rack outlet PDU cannot withstand the high temperature, resulting in a fire. Its disadvantage is that if it is not calculated well, the use of equipment is too much, after the current is too large, it will frequently cut off power and affect the normal operation of the equipment.

Overload protectors, generally two kinds, 10A and 16A, 10A stability is OK, 16A is not flattered, if the customer chooses 16A overload, we recommend to replace the 16A circuit breaker (air switch) , excellent stability!

The “lightning protection” device in the cabinet socket PDU is actually what we often call “surge protector”. Then I will elaborate on the features and functions of the “surge protector”.

Surge protection device (SurgeprotectionDevice) is an indispensable device for lightning protection of electronic equipment. In the past, it was often referred to as "arrester" or "overvoltage protector". It is abbreviated as SPD in English. The function of surge protector is to dip into the power line. The transient overvoltage of the signal transmission line is limited to the voltage range that the device or system can withstand, or the strong lightning current is discharged into the ground to protect the protected device or system from being damaged by the impact.

The type and structure of a surge protector varies according to the intended use, but it should at least include a non-linear voltage limiting element. The basic components used for surge protectors are: discharge gaps, gas discharge tubes, varistors, suppression diodes, and choke coils.

“Surge” is a transient over-voltage or over-current phenomenon caused by a variety of external and internal factors. It usually lasts only a few microseconds. However, due to its high energy, it often causes damage to precision circuits. The definition of ANSI/IEEE C62.41-1991: surge current can exceed 10,000 ampere. In our busy work environment, there will be about 1800-432,000 power surges per hour. Lightning, switching of the power grid, load switching of neighboring users, and electromagnetic field changes are the causes of this kind of power interference. Studies have shown that about 80% of transient surges are generated internally by the power supply system. From daily copiers and air conditioning equipment on and off to the start of various devices, almost all electrical equipment or systems generate surges. All affected by the surge. The cumulative effects of these surges cause the performance of semiconductor devices to deteriorate, failures and lifetimes to be reduced, eventually leading to machine damage and data loss.

The lightning protection inside the cabinet socket PDU is actually not a direct lightning strike, but a surge between the electrical appliances. The lightning-induced high current is a three-level lightning protection. It will only protect against high current surges in the moment, and it will not work for excessively low currents.

Role of the PDU in the equipment room PDU, that is, the cabinet power distribution unit. PDU products play a role in the normal operation of all expensive equipment in the associated equipment room, and require high technical content and electrical specifications. In fact, due to the special environment within the cabinet, PDUs must provide features such as lightning arrester (SPD) and overload protectors, as well as low temperature rise, high current-carrying, anti-misplugging, high-precision plug-in, and easy installation. High reliability electrical performance.

If you are still using ordinary civilian sockets in the cabinet, then room management personnel should improve their awareness of prevention as soon as possible, because electrical indicators can not adapt to your real needs is a very dangerous thing. Once the load exceeds the load capacity of the wiring and circuit structure, it will cause dangerous accidents such as heat accumulation, ignition, circuit interruption, data loss, and even electrical fire. The quality of PDUs is related to the security of all IT equipment and cannot be ignored at any time!

What is Cabinet Socket PDU?

PDU (abbreviation of PowerDistributionUnit) power distribution unit. Such cabinet-dedicated power outlets have many advantages over common outlets in terms of safety and quality, large power, multiple socket types, complete protection functions, flexible control functions, convenient use, and convenient and intelligent management.

Interface compatibility:

The standard socket socket module of various countries in the world can meet the different requirements of multi-national customers and have multiple output jacks and IEC output sockets. It is suitable for plugs of different imported instruments and equipments in many countries.

International standard rack mount:

It is conveniently installed in 19-inch standard racks and racks. It only takes up 1U of rack space. It supports horizontal installation (standard 19-inch) and vertical installation (parallel installation of cabinet columns). It can also be applied to other applications.

Convenient and reliable installation performance:

19-inch standardized design, installation is very simple. At least 2 screws are required to secure the PDU. According to the user's needs, the PDU product can be adjusted to 180 degrees. With a special L-shaped bent plate, the PDU product can be adjusted to 90 degrees.

A large class of alcohols and organic compounds is a compound in which a hydrogen atom in an aliphatic hydrocarbon, an alicyclic hydrocarbon or an aromatic hydrocarbon side chain is substituted with a hydroxyl group. Generally referred to as an alcohol, the hydroxyl group is attached to a saturated, sp3 hybridized carbon atom. If the hydroxyl group is bonded to the benzene ring, it is a phenol; if the hydroxyl group is linked to the sp2 hybridized olefinic carbon, it is an enol. The properties of phenols and enols are quite different from those of general alcohols.

A phenol having the general formula of ArOH is a type of aromatic compound in which a hydrogen on an aromatic hydrocarbon ring is substituted with a hydroxyl group (-OH). The simplest phenol is phenol. The phenolic compound refers to a compound formed by substituting a hydrogen atom on a benzene ring in an aromatic hydrocarbon with a hydroxyl group, and can be classified into a monohydric phenol and a polyhydric phenol according to the number of hydroxyl groups contained in the molecule.

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