What is the maximum current capacity of the terminal block?

Nanjing Sanmenwan Electric **** can refer to a few questions here.

1. The voltage is too high. It can be checked from the source, the secondary voltage of the transformer - the voltage in the distribution box - the voltage of each electrical equipment. Receptacles can also have mounting and locking positions.

The mounting buckle can be used to secure the PCB board more securely, and the locking buckle can lock the parent body and socket after installation. A wide variety of socket designs can be adapted to different parent insertion methods, such as horizontal, vertical, or inclined to the printed circuit board.

You can choose between metric and standard wire gauges.

2. Grounding fault. It can also be checked from the transformer and then grounded in the distribution box. The grounded should be grounded, and the normal phase wire should be eliminated from the grounding fault.

When the power is off, use the insulation meter or shake meter to measure, measure in sections, try to measure only cables, wires, circuit breakers, switches and other power supply and distribution lines in sections, and if it is really difficult to segment, pull out the fuse of weak current equipment and sensing equipment.

The key to grounding is to have a low grounding resistance and a large contact area. The former ensures that the grounding point has a ground potential as low as possible"Zero potential", which will allow you to avoid the lightning from the ground wire after the thunder you think"Reverse string"Go back and run into the possibility of the power circuit. The latter ensures that there is sufficient capacity to provide a fault current channel, including lightning or short-circuit faults.

Because the actual construction process has been changing theoretically according to the changes in contemporary technology and technology, whether this grounding method is feasible or not, whether it is good or not, depends on how the specifications of the new standard are stipulated.

Generally, it is related to the cross-section of the connected wire and the thickness of the terminal! The conductor can withstand as many volts as the terminal can withstand voltage, but the terminal that is too thin will not work!

This depends on how big the terminal is yours, and you can judge it by the copper wire connected inside the terminal.

The high-current terminal can adopt a wire spring jack structure, and the multi-wire contact ensures the safety and reliability of the wiring.

Wire spring jack high current terminal CS6-12TZ

The current terminal block model JXPSH-10 16W can pass 500A overload current in seconds.

For example, some welding machines pass 650A without problems. But the conductivity of the wire is important, generally at least copper, or silver-plated.

10-8 means that 10 square wires can be crimped, and the screws of M8 can be crimped. The current carrying capacity of 10 square copper wire is 60a, and the current carrying capacity of 10 square aluminum wire is 40a. Such wiring noses are used in low-voltage systems.

Scientifically, the amount of electricity passing through any cross-section of a conductor per unit of time is called current intensity, referred to as current. Usually represented by the letter i, its unit is the ampere (André Marie Ampere), from 1775 to 1836, the French physicist and chemist, who made outstanding achievements in the study of electromagnetic effects, and also contributed to mathematics and physics. The SI unit of electric current, the ampere, is named after its surname), abbreviated as "ampere", and the symbol "a", also refers to the directional movement of electric charges in a conductor.

The free charge in the conductor moves in a regular direction under the action of the electric field force to form an electric current.

The electromotive force of the power supply forms a voltage, which in turn generates an electric field force, under the action of which the charge in the electric field moves directionally, forming an electric current. The amount of electricity that passes through 1 coulomb per second is called 1 ampere (a). The ampere is the basic unit of all electrical properties in the International System of Units.

In addition to a, the commonly used units are kiloampere (ka) milliampere (ma), microampere (a) 1a = 1 000 mA = 1 000 000 a, and the direction of positive charge directional flow is the direction of current. The microscopic expression of the current in a metal conductor is i=nesv, n is the number of free charges per unit volume, e is the amount of charge of the electrons, s is the cross-sectional area of the conductor, and v is the charge velocity.

Nature has many kinds of carriers that carry electric charges, for example, electrons that can be moved in a conductor, ions in an electrolyte, electrons and ions in a plasma, quarks in hadrons. The movement of these carriers forms an electric current.

At present, the application of power terminal blocks in electronic equipment has become a trend, and the power terminal devices themselves are gradually increasing, and can carry greater power, as the volume of terminal blocks becomes larger, their importance in the function of the equipment is more and more prominent, and also plays an increasingly important role in ensuring product characteristics. Improved circuit board technology has resulted in a significant increase in the current that can be carried by panel-mounted terminal blocks, which now exceeds the 110A limit and far exceeds the level of previous products, making the question of which power terminal block to use to meet system requirements in the design process is even more complex. In addition, performance parameters are measured differently in different regions, and even the nominal parameters given for the same product vary considerably.

Therefore, it is important to understand these differences in order to achieve long-term reliability and keep costs low.

Users need to understand the differences between UL and IEC specifications. Terminal block products manufactured in Europe are manufactured in accordance with IEC standards, while products manufactured in the United States are manufactured in accordance with UL standards. The difference between these two standards is significant.

China Terminal Alliance Portal. China Terminal Technology Forum, China Electrical Accessories Network believes that engineers who do not understand the product specification determination method will take a considerable risk, because the selected device may not meet the required power level, or the specifications of the selected device far exceed the design needs. In Europe, the current rating of a device is determined by monitoring the temperature of the metal conductor as the current increases.

When the temperature of the metal pins is 45 °C above the ambient temperature, the current is used by the measurer as the current rating (or maximum current value) for the device. Another item of the IEC specification is the allowable current value, which is 80% of the maximum current. In contrast, the UL standard will nominate the current value of the device by 90% of the current value when the metal conductor temperature is 30 times higher than the ambient temperature.

China Terminal Alliance Portal.

Nanjing Sanmenwan Electric Appliance ****.

I don't know what you're asking, how much current with how big the wire, how big the line with the big terminal, this is fixed, the terminal must be pressed, and the large terminal above 16 flat must use hydraulic tongs.

The terminal has requirements for current in use, and the high-current terminal should be selected for large current;

Terminal block is a kind of accessory product used to realize electrical connection, which is divided into the category of connectors in industry. With the increasing degree of industrial automation and the increasingly strict and accurate requirements of industrial control, the amount of terminal blocks is gradually increasing. With the development of the electronics industry, the range of use of terminal blocks is increasing, and the variety is also increasing.

At present, in addition to PCB board terminals, the most widely used are hardware terminals, nut terminals, spring terminals and so on.

The DZ47-60 has several current ratings from 6A to 60A.

If it is a three-phase air switch, the power factor of the three-phase electricity is calculated, and the maximum power that the air switch can withstand is:

p=√3×u×i×cosφ=。

DZ47-60 series.

dz: Plastic case circuit breaker.

47: Design serial number.

60: Rated current of shell frame (maximum withstand current of shell 60A) C: For lighting distribution system (D: Distribution system of motor) 60: Rated current, 400V rated voltage.

Can withstand the maximum current switch rated current 60 A, as shown in the figure, from the upper end of the QF2 circuit breaker to connect a wire to QF5, QF5 series a wire to QF8, each of the three circuit breakers with a load of 5KW, then the current of the terminal on the QF2 circuit breaker will be about 75A, can this terminal withstand it?

Here's the schematic.

If the actual wiring should consider the size of the current, three wires can be drawn out at QF1 to QF2, QF5, QF8 respectively

75A for a long time is not good, and you must consider three-phase balance.

The landlord can look at the synchronization rate of the equipment, it should be the heating equipment. Generally, the current is the largest when the temperature rises, and the current is much smaller when the heat is warmed.

It is not lower than the rated current on the circuit breaker.

The DZ47 60 can only withstand a maximum of 63A, if the current will be 75A, the DZ47 100A 80A should be selected

The 2013 edition (latest) of the type specification for smart electric energy meters stipulates:

Terminal Blocks & Terminal Blocks:

The voltage and current terminals should be assembled in the terminal base; The terminals should be made of HPB59-1 copper or materials with better conductivity, and the surface should be passivated, chrome plated or nickel plated; The cross-sectional area and current carrying capacity of the terminal block should meet the maximum current for long-term use, and the temperature rise should not exceed the limit value

The terminal block can be matched with the wire.