Types of power plug-in devices configured for ports and wharfs: power plug-in devices for wharfs include industrial plugs and sockets, interlocking socket boxes, combined socket boxes, socket distribution boxes, etc.

1. Common industrial plugs and sockets

3-pole plugs and sockets are used for single-phase power supply, and 4 or 5 poles are used for three-phase power supply. When the neutral line of the power supply system is grounded, use 4 poles; otherwise, use 5 poles. The maintenance power socket generally uses the ground pole for 6h. If there are special requirements, other hours can be used. For example, the container freezer needs to use the plug and socket with the ground pole of 3H. Splash proof plugs and sockets are used in general occasions. If there are special requirements for waterproof or dustproof (such as powdery materials), the immersion proof type can be selected. For example, anti immersion plugs and sockets shall be used for container refrigerated cabinets, scraper conveyors, etc.

2. Interlocking socket box

The wharf emphasizes safety first, and the mechanical interlocking socket box is often used as the power plug. This kind of socket box can only be plugged and unplugged when the switch is in the "0" position, that is, when the power is disconnected, but it cannot be plugged and unplugged when powered on, so as to ensure safety.

3. On the basis of interlocking socket box, in order to prevent short circuit or overload, a combined interlocking socket box with small air switch is designed, which has higher safety and is now widely used.

4. Socket distribution box

Socket distribution box is a new type of power distribution equipment with overload, short circuit and leakage protection, and takes the socket as the output interface. This kind of socket distribution box assembled with industrial sockets is gradually replacing the terminal power box and becoming a new generation of power box on the port terminal.