The contact with the mechanical circuit of the main circuit of the circuit breaker is mainly used for the display of the circuit breaker's split and closed state. The control circuit of the circuit breaker is connected to the control circuit of the circuit breaker to control the related electrical appliances. Or interlocking. For example, a signal is output to a signal lamp, a relay, or the like. The universal circuit breaker has six pairs of contacts (three normally open, three normally closed), and the DW45 has eight pairs of contacts (four normally open, four normally closed). Molded case circuit breaker frame rated current 100A for single breakpoint conversion contacts, 225A and above for bridge contact structure, the agreed heating current is 3A; frame rated current 400A and above can be installed with two normally open, two often Closed, the agreed heating current is 6A. The number of operational performances is the same as the total number of operational performance of the circuit breaker.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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