When the single-phase line is under voltage, cut off the line and the single-phase line voltage returns to normal. After a delay, the line will automatically reset and connect without the need for manual operation. 2. When transient or transient overvoltage occurs on the line, the protector will not cause misoperation. 3. When the voltage of the circuit is unstable due to faults such as accidental contact, or when there is a sudden power outage or incoming call, the protector will not connect the circuit. When the circuit fault voltage is high, the protector itself will not be damaged. 5. The protector is characterized by inverse time action, with an action time of ≤ 1s. 6. Voltage protection range: 0~450V below 40A, 0~600V for 50/60A. 7. Impulse withstand voltage: 4kV (in accordance with Class III electrical safety standards). 8. The protector has a dual color LED indicating the working status, green indicating normal voltage, and red indicating undervoltage or delay. 9. Modular design of appearance and installation of guide rails. 10. Wiring capacity: Insulated wires of 25mm2 and below.

Surge protector is also called power supply lightning arrester (or high-voltage lightning arrester) SPD. 50/60 is applicable to communication AC HZ, and the rated current is up to 380V. In the power supply and distribution system (or communication system), the Surge protector used for power supply lightning protection becomes the power supply Surge protector, which is divided into primary power supply Surge protector, secondary power supply Surge protector, tertiary power supply Surge protector and fourth power supply Surge protector according to the level of its protective power source. 1. The current carrying capacity is different. Generally speaking, the level of overcurrent in the first level is much higher than that in the second level. The first level is mainly used for drainage pipelines, and the second level is mainly used for pressure limiting. After the first level drainage pipeline, the current value significantly decreases after the second level pressure limiting. The primary power Surge protector has a large current carrying capacity, and the discharge current is 100-200kA. The voltage protection level is 1800-2000 kV. The discharge current of the secondary power Surge protector is 40-80kA, and the working voltage protection level is lower than 25000 kV. 2. The protection effect of the primary power Surge protector is different. It is mainly used for lightning current relief. The products are mostly voltage switch type 10/350 μ S-wave pattern; The important role of secondary power Surge protector is to limit overvoltage, and the product is 8/20 μ S-wave pattern. 3. The product form is different. The first level power surge is divided into power lightning protection box (B+C box type linkage, first level power lightning protection box, first level power lightning protection control module), and the second level power Surge protector is usually the power lightning protection control module. 4. The installation methods are also different. Generally speaking, the first level of Three-phase electric power incoming distribution cabinet is installed in a house, and then the second level is assembled on each floor. The primary power lightning protection box is installed at the entrance of the building, outdoor large and medium-sized key equipment power supply, weak current machine room, etc; The primary power Surge protector is the main distribution box of the building and the internal structure of the distribution box of the outdoor machinery and equipment with large power. The secondary power Surge protector is assembled in the distribution box of outdoor incoming and outgoing line input.

The fire patrol inspection cabinet is a kind of equipment with high Factor of safety, low electric flow and low power consumption, which is favored by many different industries. In addition, this equipment also has many different functions. For this matter, the general functions of its equipment will be introduced in detail below. 1. Inspection function: Fully automatic low-speed inspection of fire pumps is carried out one by one according to the established cycle time. Generally, the rotation speed ratio of each centrifugal water pump during inspection is 300 revolutions per minute, and the inspection operation time is 10 minutes; (The duration and cycle time can be set as needed) and can be manually and automatically switched according to the power switch to complete the inspection. 2. The function of fully automatic withdrawal from inspection and entering into fire safety: The inspection cabinet automatically withdraws from inspection and enters into fire safety operation when encountering fire safety data signals during the entire inspection process. 3. Alarm and maintenance functions: The inspection cabinet also has alarm and maintenance functions for short circuit faults, overcurrent, motor power off, and other faults. During the entire inspection process, faults are detected and sound and light alarm data signals are sent out. The alarm equipment has fault memory function, recording the specific content and duration of the fault. Fire inspection cabinet 4. Remote control monitoring and operation function: The inspection cabinet can be equipped with remote control and controller according to the customer's requirements. According to the system bus and fire safety control center communication, it can achieve the goal of operating the fire safety control center monitoring system. 5. Pressure water supply function: The inspection cabinet can also carry out pressure water supply for the pipeline system software based on the configuration of the fire pipeline. Equipment for pressure water supply inspection should be selected, and the pipeline should have anti overpressure measures. Equipment should be installed to inspect and release pressure control circuits, and the circuit settings should be reliable. 6. Alarm SMS function on mobile phones: According to the customer's needs, the inspection cabinet can also be equipped with a SMS alarm module. When a fault occurs, the fault information content is sent to the customer's mobile phone based on the SMS message, reminding the customer to handle it properly. The above six points are a detailed introduction to the common functions of fire inspection cabinets. Based on their detailed introduction, customers can have a clearer understanding of the application of the equipment, thereby reducing equipment application failures and reasonably increasing its service life.