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Industrial Control Wiring Guide 2E Episode 11

Tham khảo tài liệu 'industrial control wiring guide 2e episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 9. COMPONENTS PASSIVE 9.1.4. Chassis-mounted fuse holders Chassis-mounted fuse holders which have plug in fuselink carriers. The fuse carrier is removed to fit the fuse cartridge. They are surface-mounted either bolted directly to the chassis or clipped to a DIN rail. These generally have screw clamp wire terminations for the panel wiring. The removable fuse carrier accepts fuse cartridges. 9.1.5. Fuselinks Fuselinks are cartridges with welded termination brackets. A fuselink holder will only accept one style. Basically there are only two styles commonly used A and NS but be aware that there are some specials which will only fit into their own holder. A fuselinks. These are fixed to the carrier with screws. 94 9. COMPONENTS PASSIVE NS fuselinks which plug into slots in the contacts in the fuse carrier. A G.E.C. catalogue will show this to be a 75 A ultra fast acting fuse. The value of the fuse is given in amperes -abbreviated to amps or A. Fuselinks are available in a range of ampere values as well as a number of distinct types. They may be anti-surge T fast acting F High Breaking Capacity HBC or special semiconductor types. Other features such as indicating when blown or special materials may also be called for. These attributes will only be indicated in the maker s code number which will also appear in the parts list. European standard fuses are now being used. The D NH and NEOZED are the most popular. 95 9. COMPONENTS PASSIVE 9.2. Resistors These are components which are designed to resist control or oppose the flow of electric current. Physically they vary in size from small 5 mm long carbon devices to large wire-wound power resistors up to about 300 mm long . 9.2.1. Symbols There are two symbols in common use. BSI-preferred. Old but still used. 9.2.2. Fixed resistors Small wire-ended resistors are soldered to a printed circuit board or a tag strip to make a subassembly. .