Equipment connections in the industrial, electrical and other fields are inseparable from connectors, and rail-type terminal blocks are the most widely used type of connectors . There are various types of track terminals: UK universal voltage terminal, UL-URTK current terminal, JHY1 plate crimp terminal, UL-USLKG ground terminal... UL-URTK current test terminal is the protagonist of this article.
product description
The UL-URTK current test terminal consists of screws, crimping frames, switch bridges, spacers, and grouping partitions. The insulating material is nylon PA, and the flame retardant grade is UL94-V0. The terminal can be connected with 0.5-10mm2 rigid wire or 0.5-6mm2 flexible wire; rated current 57A, rated voltage 400V; applicable wire gauge 20-8AWG. With universal mounting feet, it can be mounted on U-shaped rails or concave rails.
Principle of use
When the secondary circuit of the current transformer is in operation and needs to be connected to the experimental instrument and cannot be opened, the current terminal needs to be on the scene. Sliding metal parts, through the terminal crimping frame can withstand the maximum working current, use the screwdriver to loosen the screw when switching, move the slider, so that the switch position is clear at a glance; the test socket is provided at both ends, with the corresponding test end Connection testing can be performed and the current can be measured without interruption.
The use of such terminals makes it very convenient to implement various test connections for the secondary circuit of the current transformer. It has an auxiliary socket on each side of the longitudinal split slider for fixed or breakable lateral bridging. The auxiliary jack is like a raised "dome" with an inner diameter of 4 mm and the test plug can be inserted directly into it. The breaking slider is extremely easy to operate, its construction is stable, its resistance to short circuit is strong, and the screwdriver does not slip off the slider screw during operation. From the top down, the switch status is clear and easy to distinguish. A single-phase current transformer test circuit requires only two terminals. That is to say, such a terminal saves terminal and space more than a through-type terminal. Other advantages of this type of terminal are: fewer accessories are required, and the installation is convenient, the switch circuit is clear, easy to distinguish, and easy to operate.
Related links: How is the voltage terminal and current terminal distinguished?
There is no difference between the voltage terminal and the current terminal shape, which can be distinguished from two aspects:
1. Pay attention to the wiring diagram of the watch when wiring. The main difference between these two types of terminals is that voltage terminals, also called ordinary terminals, generally cannot be disconnected from themselves, and can only be disconnected through connectable terminals; large current terminals can usually be disconnected for testing.
2. The digital codes used on the electrical drawings are different. For example, the current terminals are all started with 4, such as A411, A412, C411, C412, etc.; the voltage terminals start with 6, such as A630, B630, etc.
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