Frame circuit breaker manufacturers say a larger number of circuit breaker product types, broadly divided into: plastic case circuit breakers, frame circuit breakers, small circuit breakers, vacuum circuit breakers, etc. Today we introduce the differences between plastic case circuit breakers and frame circuit breakers.

The difference between the two is simply the size, where the size difference is not only that the frame circuit breaker is larger than the plastic case circuit breaker, but also the current level of the frame circuit breaker. The sectional capacity is greater than that of plastic case circuit breakers. The two applications are therefore different, with frame circuit breakers being used for the upper inlet and plastic case circuit breakers for the lower frame.

Frame circuit breakers and plastic case circuit breakers are the most commonly used products in circuit breakers, but many people do not know the difference between the two and often do not know how to choose the situation when buying. In response to this problem, the plastic case circuit breaker manufacturers were consulted to introduce the differences between plastic case circuit breakers and frame circuit breakers and the matters that should be noted when selecting them.

2. Plastic case circuit breakers are suitable for branch protection switches

Plastic case circuit breaker is grounded outside the terminal striker, interrupter, contacts and operation management institutions are available in the design of a Chinese plastic shell, generally do not consider for maintenance, suitable for branch protection control switch, overcurrent striker has electronic and electromagnetic two kinds, which we generally use electromagnetic plastic case circuit breaker for non-selective circuit breakers, only long delay and instantaneous two kinds of environmental protection work way, electronic type molded case circuit breaker has a long delay, short delay, instantaneous and grounding system fault analysis four kinds of information protection ecological function. Some of the electronic type molded case circuit breaker new product development also comes with area has selective chain enterprise function. Most of the moulded case circuit breakers are operated in manual mode, there are also important parts with motor related operation.

All components of the circuit breaker are mounted in an insulated metal frame, usually open-ended, allowing for the installation of various accessories and easier replacement of contacts and components, and are commonly used as main switches at the power end. Overcurrent derailleurs are available as electromagnetic derailleurs, electronic derailleurs and intelligent derailleurs. The circuit breaker has four protection sections: long delay, short delay, instantaneous and earth fault. The rectification value of each protection is adjusted within a certain range according to the level of its enclosure frame. With the development of microelectronics technology, some intelligent circuit breakers have a zone selection chain function, which fully ensures the sensitivity and selectivity of the operation.

1. Rack circuit breakers with large breaking capacity and perfect function

Plastic case circuit breakers use plastic structure, which is characterised by the plastic casing and frame of the circuit breaker, contacts and arc extinguishing system placed in the insulation chamber to prevent inter-phase short circuit, to ensure that the arc is ejected upwards, to ensure that the contact system is reliable breaking. The frame circuit breaker has a modular structure and is divided into a frame, contact interrupter system, manual operating mechanism, electric operating mechanism, intelligent controller and drawer block. Each part becomes a complete and independent part, and only 1-2 screws are needed to fix it during assembly. It is very easy to dismantle and assemble, which is conducive to overhaul and maintenance.

Plastic case circuit breaker products of different types, which are characterised by compact structural design, easy operation process, functional analysis can be simple, generally through the configuration of overcurrent decoupler and instantaneous decoupler, frame circuit breakers are constantly improving the function, especially in China in recent years the application of single-chip control technology, frame circuit breakers towards high-performance, easy maintenance, networked direction of rapid development.

Plastic case circuit breakers are generally rated below 630 A (up to 1600 A for some new products), frame circuit breakers are rated higher, typically 630 A - 6300 A (e.g. our DW15 products). The DW16 and DW17 series of frame circuit breakers comply with this standard. In addition, frame circuit breakers are higher than plastic case circuit breakers in terms of cross-sectional capacity. In practice, circuits above 800A or those requiring particularly high sectional capacities or those requiring more functions should use frame type circuit breakers, while circuits below 630A generally use plastic case circuit breakers.