Drop-out fuse cutouts offer a reliable mechanism for providing circuit protection in Aerial distribution systems for voltages ranging from 11kV to 36kV. It is designed to be installed outdoors for vertical cross arm or pole mounting. we can produce all types of fuse cutouts with different designs. There are two types, one is the porcelain insulator supported type, and another is the porcelain insulator supported type.
Rich Power offers Type L cutouts in both polymer and porcelain designs, which provide reliable overcurrent protection for primary distribution circuits. Overcurrent protection safeguards an electric system from excessive currents produced by abnormal conditions such as faults, line or equipment overloads, or equipment failures. Polymer Type L cutouts are ruggedly constructed and will provide full-range overcurrent protection from minimum melt of a given fuse link to the maximum nameplate interrupting current rating of the cutout.
Polymer cutouts are available in 12-15.5 kV, 24-27 and 33-38 kV kV voltage ratings. Polymer Type L cutouts are available with a 100 A or 200 A fuseholder or with a 300 A disconnect blade.
Polymer-insulated and porcelain Type L cutouts have been tested to, and meet or exceed all requirements set forth by IEEE Std C37.41™ and IEEE Std C37.42™ standards.
Polymer Cutout Applications:
Proper cutout application requires several major system considerations: system operating voltage, insulation level, type of system grounding, maximum available fault current the cutout may be subjected to, and anticipated maximum continuous load current.
The polymer Type L cutout voltage rating is the maximum design voltage of the cutout. It can be applied, without restrictions, on any three-phase system that has system line-to-line voltage less than or equal to the cutout rating. Type L cutouts can also be applied on single phase or three-phase solidly grounded wye connected circuits. The circuit can have line-to-neutral voltages up to the voltage rating of the cutout as long as the maximum recovery voltage does not exceed the cutout’s rating. The Basic Impulse Insulation Level (BIL) of a cutout should be coordinated with the insulation of other connected apparatus. The interrupting rating of a cutout should be greater than or equal to the maximum available system fault current unless used in conjunction with current-limiting fuses. The cutout selected should have a continuous current rating sufficient to handle the expected load. The 100 A rated fuseholder accepts fuse links from a fraction of 1 A to 100 A. The 200 A fuseholder will accept fuse links with ratings above 100 A to 200 A. When selecting a cutout or fuse, it is important to consider future load growth and other planned system expansion.
Rich power also offer OEM production service, we are a leading manufacturer and supplier of fuse cutout here.
The backbone of the polymer-insulated Type L cutout is comprised of an E-glass fiberglass rod with crimped-ongalvanized steel hanger and end fittings. The crimping process results in a robust design capable of withstanding numerous opening and closing operations and the severe forces present during fault current interruptions. The frame is over molded with the industry leading, track resistant, silicone rubber polymer-housing. Independent laboratory tests have verified the superiority of silicone rubber in terms of resistance to UV degradation, surface tracking/performance in contaminated environments, and other important insulating properties. The complete cutout assembly works together as a system and will stand up to years of exposure to environmental extremes. The fuseholder is constructed of an epoxy impregnated glass filament wound tube over a moisture-proof inner polymer liner material. A large bronze cast pull ring is utilized for ease of installation and re-fusing. The bronze trunnion, with lifting ring having both front and side accessibility, is silver plated for minimum contact resistance. The grooved flipper assembly controls link tension, assures low-fault current interruption and prevents link breakage on “close-in.”
Specifications and Types：
1. Ambient Temperature: -40℃~+40℃
2. Altitude: ≤1000m
3. Wind speed: ≤34m/s
4. Installation site: location where is no flammable and explosive substance, pollution,chemical corrosion and intensive vibration.
Spare parts and accessories:
The cast bronze lower hinge assembly has deep pockets for the trunnion to pivot to minimize accidental fuse removal. The rugged design with wide opening means easy fuseholder installation and removal. The lower contact assembly utilizes stainless steel backup springs and silver-to-silver contacts to minimize contact resistance and assure excellent continuous contact throughout the life of the cutout. The contacts are designed to carry 300 A continuous. Silver-to-silver top contacts are again used to minimize contact resistance. The Type L cutout design develops high contact pressure to assure excellent contact for operating currents and until fault interruption is completed. Loadbreak hooks, for use with a loadbreak tool, are standard and serve as a “close-in” guide to assure positive make. Lubricant is applied to all separable connector interchanges. All hardware is designed to interlock during assembly to assure correct alignment. The rugged design assures smooth operation and long life.
Rich power also offers all spare parts of cutout fuse including all casting parts.
We also can produce the spare parts separately for the customers including fuse holder, Porcelain supporting, Cover, and brass parts.
