We are delighted to announce that we will be attending the 23rd China International Industry Fair (CIIF) in Shanghai from September 19 to 23, 2023. CIIF is one of the leading events in China’s industry market with the largest scale, most functions and the highest level. It is a major occasion and platform in the national industrial field to trade, communicate and cooperate with the rest of the world.

We are a manufacturer of MCCB, AC contactor and other low voltage related products. Our products are of high quality, reliability and performance. We have been in the foreign trade business for over 17 years and have established long-term partnerships with many customers from different countries and regions. We are looking forward to meeting you at our booth at CIIF 2023 and showing you our latest products and solutions.

CIIF 2023 will comprise nine theme shows under one roof and occupy 300,000 sq. meters as its display area. Over 2,600 exhibitors are expected to attend the event. The theme shows include metalworking and CNC machine tool show, industrial automation show, environmental protection technology and equipment show, information and communication technology show, new energy auto show, scientific innovation show, robotics show, energy saving and new energy vehicle show, and China aerospace and aviation show. You will have the opportunity to explore the latest trends and developments in various industries and sectors.

If you are interested in attending CIIF 2023, please visit the official website (https://www.ciif-expo.com) for more information and registration. You can also contact us by email or phone if you have any questions or inquiries.

We hope to see you soon at CIIF 2023!

The trip unit is a device mechanically connected to the circuit breaker to release the holding mechanism and automatically disconnect the circuit breaker. Its function is that the vector sum of the current passing through the zero-sequence current transformer is not equal to zero when there is leakage in the line or personal electric shock, and the voltage is generated on both sides of the secondary coil of the transformer, and is amplified by the integrated circuit. The trip unit cuts off the power supply within 0.1 seconds, thus playing the role of electric shock and leakage protection.

Release function

The trip unit has protection functions such as overload, open circuit, leakage, undervoltage, overvoltage, unbalance, underfrequency, overfrequency, reverse power, phase sequence, etc. It also has load monitoring, real-time value measurement, demand measurement, and harmonic measurement. , Measurement table setting, maintenance, communication, DI/DO, regional selective interlocking, test interlocking, LCD interface display and other functions.

Classification of trip units

1. Thermal release
Thermal magnetic release provides magnetic protection and thermal protection, thermal protection is overload protection. Thermal protection: When the current passes through the release, the thermal element heats up (the direct heating current directly passes through the bimetallic sheet), and the bimetallic sheet is deformed by heat. When the deformation reaches a certain level, it hits the drawbar to drive the mechanism to cut off the circuit. Generally speaking, thermal magnetic trips are used in circuits to provide short-circuit and overload protection. Only in some special occasions, electromagnetic trips are used to provide short-circuit protection, while other components (such as thermal relays) provide overload protection.
2. Electromagnetic release
The electromagnetic release is connected in series with the protected circuit. When a normal current passes through the line, the electromagnetic force generated by the electromagnet is less than the pulling force of the reaction force spring, the armature cannot be attracted by the electromagnet, and the circuit breaker operates normally. When a short circuit fault occurs in the line, the current exceeds several times of the normal current, the electromagnetic force generated by the electromagnet is greater than the force of the reaction force spring, and the armature is attracted by the electromagnet and pushes the free tripping mechanism to release the main contact through the transmission mechanism. The main contacts separate and cut off the circuit under the action of the opening spring to protect the short circuit.
3. Loss of pressure release
The voltage-loss release is connected in parallel with the power supply side of the circuit breaker, which can play the role of under-voltage and zero-voltage protection. When the power supply voltage is normal, the operating handle is pulled, the normally open auxiliary contact of the circuit breaker is closed, the electromagnet is energized, the armature is attracted by the electromagnet, and the main contact can be locked in the closed position by the free trip mechanism, and the circuit breaker is put into operation. . When the power supply side is powered off or the power supply voltage is too low, the electromagnetic force generated by the electromagnet is not enough to overcome the pulling force of the reaction force spring, the armature is pulled up, and the free tripping mechanism is pushed by the transmission mechanism to make the circuit breaker trip, resulting in undervoltage. and zero voltage protection.
When the power supply voltage is 75% to 105% of the rated voltage, the loss-of-voltage release is guaranteed to pull in, so that the circuit breaker can be closed smoothly; when the supply voltage is lower than 40% of the rated voltage, the loss-of-voltage release is guaranteed to be disconnected Make the circuit breaker trip off. Generally, the normally closed button connected in series in the electromagnetic coil circuit of the loss-of-voltage release can also be used for the opening operation.
4. Shunt release
The shunt release is used for remote-operated low-voltage circuit breaker opening control. Its electromagnetic coil is connected in parallel with the power supply side of the low-voltage circuit breaker. When the opening operation is required, press the normally open button to make the electromagnet of the shunt release get electricity to attract the armature, and push the free release mechanism through the transmission mechanism to make the low-voltage circuit breaker trip.
5. Electronic release
The electronic release can have all the above functions and can be easily adjusted. Electronic trip unit is a circuit composed of electronic components, detects the current of the main circuit, amplifies and pushes the tripping mechanism.

Thermal release protection principle
The main purpose of overheating protection is to prevent the motor from overheating. Therefore, a model to simulate the motor heating is set up in the device, and the different heating effects of positive and negative sequence overload currents are considered comprehensively, and the heating and cooling process of the motor is simulated and calculated, mainly for the heating of the motor and long-term overload. Provide protection. And it has thermal memory, that is, after the protection acts on trip or signal, the motor is allowed to start again only when the heat accumulation value is reduced to below the fixed value through the process of heat dissipation.
Thermal tripping is the tripping of the overheat protection action, and the overheating protection is the overload protection with the characteristics of delayed tripping and delayed return. Setting of thermal release: larger than the rated current (1.1 to 1.2 times).

The distribution of household air switches, grasping the following elements is the key:

(1) Is the main switch of the home an air switch or a leakage protection?

The main switch is equipped with leakage protection, which is a way to save money, but in terms of influence, as long as the lamps and sockets in any of the following circuits leak electricity, the main switch will trip, and the impact is too great. The standard practice is to provide electrical protection for the common socket circuit, the cabinet air conditioner socket circuit and the bathroom lighting circuit, that is, the circuit below the distribution box should be set with leakage protection based on functional considerations. Although the cost of such an approach has increased, the safety and the impact of power outages have become smaller.

(2) How to distribute household sockets and switches

Distribution of sockets:
1. There are 2 sockets on the TV background wall in the living room, one on the left and right on the sofa background, and one on each other wall;
2. One for each wall in the dining room, generally around 2 to 3 in total (sometimes the refrigerator will be considered in the living room);
3. There are 2 sockets at the TV cabinet in the bedroom, one on the left and right of the bed background, and one on the wall by the window or balcony (if there is a desk in the bedroom, additional computer sockets should be considered);
4. There are about 4 to 5 kitchens;
5. 2 toilets.
Switch control:
1.The switches in the living room, dining room, and aisle are centrally installed for one control (if the aisle is long, it is better to control both ends);
2. Room control switch;
3. Kitchen single switch;
4. Single-connection switch in the bathroom (repurchased by Yuba);
5. Balcony single switch;
Circuit distribution:
1. Aisle, living room, dining room lighting 1 circuit;
2. All bedrooms (within 3 bedrooms), balcony lighting 1 circuit;
3. Kitchen and bathroom lighting 1 circuit (consider Yuba power);
4. Living room, dining room, aisle socket 1 circuit;
5. 1 circuit of kitchen and bathroom sockets (considering that kitchen appliances are relatively concentrated, if conditions permit, consider a separate circuit in the kitchen);
6. Bedroom (below 2 bedrooms), balcony socket 1 circuit;
7. Each air conditioner has 1 circuit;

(3) The grouping after that, is it grouped by purpose or by region?

You can group by purpose. All lighting uses air switches, and the air switches of multiple sockets share a leakage protection, which is economical and safe. Air conditioners, refrigerators, kitchen appliances, and bathroom heaters are all separate, and there is a separate room for lighting after a total switch.
Distinguish by function, namely: lighting, ordinary sockets, toilet sockets, air conditioning sockets

(4) When installing concealed wires, is it better to use single-core wires or multi-strand wires?

If you install dark wire, it is better to use single core wire.

The year 2022 marks the beginning of China-Asean comprehensive strategic partnership and the first year for the Regional Comprehensive Economic Partnership (RCEP) to formally enter into force, Ministry of Commerce spokesperson Shu Jutting said at a regular press conference on Thursday. China and ASEAN countries have carried out pragmatic economic and trade cooperation and implemented the RCEP in a high-quality manner. Bilateral trade has maintained a sound momentum of growth, showing strong resilience and huge potential. From January to September, China’s import and export to ASEAN reached 4.7 trillion yuan, up 15.5 percent year on year, accounting for 15.2 percent of China’s total foreign trade. China has remained ASEAN’s largest trading partner for 13 consecutive years, and ASEAN’s position as China’s largest trading partner has been further consolidated.

Shu Jutting said closer exchanges between China and ASEAN and deepening cooperation in industrial and supply chains have contributed significantly to global economic development. China will continue to strengthen trade and investment cooperation with ASEAN countries, maintain the security and stability of regional industrial and supply chains, and build more mutually beneficial bilateral and regional economic and trade relations.

Our company has always had good trade relations with Southeast Asian countries.

Shendian Electrical Co., LTD. is a manufacturer founded in 1992. Our company has been committed to the development and production of low-voltage electrical products. 

The main product line includes MCCB, ACB, MCB, MPCB and AC contactor.

Our products got a lot of praise from our customers because of the high quality, customization, stable delivery and other aspects.