The contactor uses a coil to control the on and off of the circuit. After the contactor is energized, it is normally closed and closed, and normally closed, so as to be controlled.
1. The main protection of the circuit breaker is correct. Its protection is currently commonly used in three-stage protection, which is overload protection, short-circuit short-delay, and short-circuit long delay. There are also some undervoltage, overvoltage and other protection functions. It depends on the brand and model. Its opening and closing can be manual or electric. There are three ways of installation: fixed type and drawer type. According to the magnitude of the current and the level of the operating voltage, it can be divided into a low-voltage molded case circuit breaker, a low-voltage frame circuit breaker and a high-voltage vacuum circuit breaker. According to the different trip curve, it can be divided into different use occasions. And the fuse is still very different.
2, the contactor is mainly used for industrial control, the general load is mostly motor, of course, there will be some heaters, do dual power switching and other occasions. The switching of the contactor is achieved by controlling the coil voltage. According to different structures of arc extinguishing, it can be divided into vacuum contactors and common contactors. According to different control voltages, it can be divided into DC contactors and AC contactors. Its main accessory is the auxiliary contact. Moreover, it does not have short-circuit protection and overload protection capability, so it must be used together with fuses and thermal relays.
Fittings For Toilet And Flush Tank
Fittings for two piece toilet:
1. inlet valve ( lower pressure inlet valve and high pressure inlet valve)
2. flush valve and accessories for one piece toilet, two piece toilet and wall hung flush tank
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