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Introduction to the overvoltage and undervoltage delay protector for three-phase 4P63A incoming line:

Functional features
Overvoltage and undervoltage protection: When overvoltage or undervoltage occurs in a three-phase line, it can quickly cut off the circuit to protect the equipment at the back end. The overvoltage action value is 460V±5V, and the undervoltage action value is 300V±5V.
Automatic reset: Once the voltage returns to the normal range, the protector will automatically reconnect the circuit after the specified delay time. The recovery delay time is 60 seconds.
Other protections: Some products also feature protection functions such as phase failure, neutral line failure, and three-phase imbalance. The 3P+N system can monitor and protect against various fault conditions.

This series of fuses is suitable for circuits with rated DC voltage up to 1000Vand rated current up to 30A They are connected in series and parallel withphotovoltaic panels and batteries to provide short-circuit breaking protection forcharging and converting systems; Simultaneously, for photovoltaic power plants,combiner inverter rectification systems, and short-circuit fault breaking protectionAnd for the rapid breaking protection of surge current and short-circuit faultovervoltage in photovoltaic power generation systems, with a rated breaking capacityof 20KA. 0ur company is currently conducting relevant tests to further improve thebreaking capacity of the product. The product complies with the provisions of theInternational Electrotechnical Commission standard EC60269.

The SRH8 series household AC contactors (hereinafter referred to as contactors) are mainly applicable to circuits with an AC frequency of 50Hz(or 60Hz), a rated working voltage up to 400V, and a rated working current up to 63A, for controlling household appliances and similar low-inductance and micro-inductance loads. They can also be used to control household electric loads, in which case the control electric power should be reduced accordingly. The product is used in homes, hotels, apartments and other places to achieve automation functions and is applied in large-scale production of household appliances.

The SR219G-125 disconnector (hereinafter referred to as the switch) is suitable for AC 50/60Hz, rated current 125A and below, and rated voltage up to 400V in distribution and control circuits. It is mainly used as the main switch in terminal combined electrical apparatus and can also be used for infrequent control of various low-power electrical appliances and lighting. It is widely used in industrial and mining enterprises, high-rise buildings, commercial and other fields Places such as families.

Definition: The L7 photovoltaic DC circuit breaker is a miniature circuit breaker suitable for circuits with an AC frequency of 50Hz/60Hz, a rated working voltage of DC500V, DC1000V, or DC1500V, and a rated current up to 63A.
Application: It is mainly used in industrial, commercial, high-rise, and residential buildings, serving as a means for infrequent connection, disconnection, and switching of distribution lines, providing overload and short-circuit protection for lines and equipment. 
Installation method: Usually installed on TH35-7.5 mounting rail, with installation category being II and III.

Main Parameters 
Rated current: There are multiple options available, including 1A, 2A, 3A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A.
Rated short-circuit breaking capacity: Generally, there are two options: 6kA and 10kA.
Pole number: It includes single-pole, two-pole, three-pole, and four-pole. The rated voltage of single-pole circuit breakers is 230V, while that of two-pole, three-pole, and four-pole circuit breakers is 400V.
Instantaneous tripping current form: There are three types: B, C, and D.

PV DC circuit breakers are primarily used for on/off control and fault protection of DC circuits in PV systems. Common application scenarios include:
1. PV Module Side
Within the PV array's combiner box, they protect the DC circuits of individual PV modules or strings, preventing module failures (such as short circuits or overloads) from affecting the entire array.

2. Inverter FrontEnd
In the DC side of the circuit connecting the PV array and the inverter, they quickly disconnect the DC power supply when the inverter fails or requires maintenance, ensuring the safety of equipment and personnel.

3. Energy Storage System Interface
In a combined PV and energy storage system, they control the circuit between the PV DC side and the energy storage battery, preventing energy storage system failures from adversely affecting the PV array.

4. DC Merging Link
In the DC merge cabinet of a large PV power plant, they protect the circuit after multiple PV strings merge, ensuring stable and safe current flow during the merging process.
These scenarios all need to deal with the high voltage and high current characteristics of photovoltaic DC circuits, and avoid safety hazards such as arcing. Therefore, there are special requirements for the arc extinguishing ability and highvoltage resistance of the circuit breaker.