Fuse Links Selection Guide:
The purpose of using fuses is to out off the line safely and correctly to protect discrete components or the whole line in case of circuit errors. The following are the necessary conditions to be considered when selecting fuses.
Usual Service Conditions and Installation Conditions:
- Ambient temperature:-5℃~+40℃
- Height above sea level not more than 2000m.
- Atmospheric condition: humidity: the installation site's relative air humidity does not exceed 50% while the maximum temperature is +40'C. And it can allow to have higher relative humidity under lower temperature. The average temperature does not exceed +25C while in the wettest month, and the maximum relative humidity does not exceed 90%in this month. We must take measures when there is condensation on the products which due to the changed temperature.
- Class of pollution: Third class
- Sort of installation: III
Malfunction:
Malfunction is usually a result of incomplete analysis on the design of circuit, Special attention should be given to 1) normal rated current; 3) Ambient temper- ature; and 6)overload increasement of factors to be considered for selection of fuses listed below. For example, frequent reasons for malfunction under normal working conditions are insufficient consideration to the start current of capacitor circuit and the ambient temperature around the fuse link.
Rated breaking capacity:
Rated breaking capacity is the maximum short-circuit current allowed for the fuse link to cutout reliably under rated voltage. The instantaneous current loaded to the fuse link is much larger than the normal working current when short-circuit occurs. The fuse link is supported to cutout the line in an undamage condition i.e. without bursting. The rated breaking capacity of TIRH fuses is up to 120KA and the excellent current limiting characteristics reliably protect the equipment form damages by electric power.
RT18-32X Series Cylindrical Fuse Holders 32A 1P/2P/3P
Description:
This series of fuse links is mainly used in AC 50Hz,rated voltage up to 690V, rated current up to 125A and for protecting electric equipment from overload and short-circuit. It can reliably break the min fusion current to any current within 120KA.
It is also available for the protection of semiconductor parts and equipment against short-circuit(type aR)and protection of motors(type aM).
This series of fuse links conforms to GB13539 and IEC 60269 standards.
Design Features:
Variable cross-section fuse element made from pure metal sealed in cartridge made from high-duty ceramic or epoxy glass Fuse tube filled with chemically treated high-purity quartz sand as arc-extinguishing medium. Dot-welding of fuse element ends to the caps ensures raliable electric connection; Striker may be attached to the fuse link to provide immediate activation of micro-switch to give various signals or cut the circuit automa-tically According to customer demands we can also produce special fuse body, this series of fuse-type plug-in structure, according to the size, it can be installed in the RT14, RT18, RT19 and other corresponding size fuse assembly.
Technical Specification:
| Product Model | Applicable Fuse Link Size | Rated Voltage | Rated Current | Overall Dimension(mm) |
| A1 | A2 | B | H1 | H2 |
| RT18-20(X) | 8.5*31.5mm | 500V | 20A | 80 | 82 | 18 | 60 | 78 |
| RT18-32(X) | 10*38mm | 500V | 32A | 79 | 81 | 18 | 61 | 80 |
| RT18-63(X) | 14*51mm | 500V | 63A | 103 | 105 | 27 | 80 | 110 |
Factors To Be Considered For Selection of Fuses:
- Normal working current
- Working voltage
- Ambient temperature
- Overload current and cutout time
- Possible malfunction current
- Impulse current, surge current, starting current and transient value of the line
- Size and dimensions, connection methods, indicators, etc.
Ambient Temperature:
Ambient Temperature means the air Temperature directly around the fuse, and should not be understood as the room temperature. In many application cases, the fuses are at rather high temperature as they are installed with supporting devices or bases in different structures and they are closed in the distributing or controlling boxes.
Further information:
1. Plastics materials: all raw materials are brand-new and second-hand materials are forbidden. Furthermore some of them are supplied by super branding companies like DSM, Mitsubishi.
2. There is just one level of quality as A in MEIHENG and we are aim to provide the excellent articles to our clients and help them gain more market shares.
3. ODM: we are providing ODM services to the super companies (more than 15) who are top-10 electrical industrial companies in their country. Just show us your ideas and we will present a solution.
FAQ
A. How's the delivery time?
Depend on your quantity, usually within 20days after receiving deposit
B. Would you accept OEM/ODM service?
Glad to say that there is planning department, technical department and mould tooling center in
our factory. For the OEM & ODM, it is ok for us if your brand, market shares are great.
Product Tags:
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