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At present, we are sending goods directly from Chinese factories to customers, saving a lot of middlemen's costs. In the future, overseas companies or agents will also be directly operated by the company.

You can send your enquiry directly to us, we have special sales to arrange samples for you, or you can buy through the e-commerce platforms such as: Aliexpress, Amazon, Ebay....

Tongou company has a series of certification and ISO9001 quality management system certification, as well as TUV, CE, SAA, ESV, CB and some international CNAS certification laboratory certificates, so the products meet the standards of the International Electrotechnical Commission.

Before starting the order, we will confirm the delivery date with the clients, when the production is halfway through that will update the production status to clients again. (Unless it is a cause of force majeure, such as an epidemic, a natural disaster)

Tongou was established in 1993, focusing on the electrical industry for more than 30 years, an electrical factory with rich experience. if you are engaged in a business related to circuit breaker products and cooperate with Tongou, you can very easily solve some of the technical support and problem, you will get the same quality as the big international brands and good factory price, enjoy the satisfaction of high recognition from customers with stable development.

There are many customers who do not want to disclose information, we can only say some: Thyssenkrupp, Haski, STD, HL, Vistar...

1. According to the application category, they are divided into selective type (with adjustable protection device parameters) and non-selective type (with non-adjustable protection device parameters). 2. Based on the structural form, they are divided into universal type (also known as frame type) and molded case type. 3. According to the arc extinguishing medium, they are divided into air type and vacuum type (currently, most domestic ones are air type). 4. Based on the operating method, they are divided into manual operation, electric operation, and spring energy storage mechanical operation. 5. According to the number of poles, they are divided into single-pole, two-pole, three-pole, and four-pole types. 6. Based on the operating speed, they are divided into general type and fast-acting type. Fast-acting circuit breakers are further divided into AC fast-acting type and DC fast-acting type. The AC fast-acting circuit breaker is usually called a current-limiting circuit breaker, and its breaking time is short enough to interrupt the short-circuit current before it reaches its expected peak value. The DC fast-acting circuit breaker can also interrupt the short-circuit current before it reaches its maximum value. 7. According to the installation method, they are divided into fixed type, plug-in type, drawer type, and embedded type. 8. Based on the application, they are divided into distribution circuit breakers, motor protection circuit breakers, field-extinguishing circuit breakers, and leakage circuit breakers, among others.

It is a mechanical switching device that, under normal operating conditions, makes and breaks the load current, and under specified conditions, causes the contacts to open when the residual current reaches a certain specified value.

It is a switching device that can make and break the load current under normal circuit conditions, and under abnormal circuit conditions (overload, short circuit, especially short circuit), it can make, carry for a certain period of time, and break the current.

It is a protective device that causes the contacts to operate and disconnect the main circuit when the residual current of the circuit reaches its specified value under specified conditions. A Residual Current Device can be a combination of various components that detect residual current and make or break the main circuit current.

It is the vector sum of the instantaneous values of the currents flowing in the main circuit of a residual current device (expressed in RMS value).

It is the total current between the exposed conductive surfaces of a device and the ground, including capacitive coupling current.

Early circuit breakers only had one-stage protection for short-circuit instantaneous tripping. Later, they evolved to two-stage protection, which includes long-time delay for overload and instantaneous tripping for short circuit. Currently, most mass-produced miniature circuit breakers and molded-case circuit breakers feature this two-stage protection. Circuit breakers have further evolved to include short-time delay for overload and ground fault protection, known as "four-stage" protection. In addition, circuit breakers can be equipped with accessories to provide under-voltage protection. Modern advanced circuit breakers have introduced microelectronic technology, enabling them to have certain intelligent functions.