Description
RT18 Cylindrical Fuse Holder is designed for installing and securing cylindrical fuse links in low-voltage electrical distribution and protection systems. The RT18 series offers multiple fuse size configurations, rated current options and indicator versions to meet different industrial electrical installation requirements.
The RT18 series is available in three fuse size configurations: 8.5×31.5mm, 10×38mm and 14×51mm, covering rated current options of 20A, 32A and 63A respectively. Both standard and indicator-equipped versions are available to meet different installation and monitoring requirements.
The X-marked models feature an indicator, which provides a visual indication when the corresponding fuse operates. This makes it easier for maintenance personnel to identify a blown fuse and perform inspection or replacement.
With multiple model options and compact mounting dimensions, RT18 cylindrical fuse holders are suitable for electrical distribution panels, industrial control equipment and low-voltage protection assemblies.
Key Features
- Designed for cylindrical cartridge fuse links
- Three compatible fuse sizes: 8.5×31.5mm, 10×38mm and 14×51mm
- Rated current options of 20A, 32A and 63A
- Rated voltage of 500/690V
- Indicator and non-indicator versions available
- X-marked models feature a fuse status indicator
- Compact design for electrical panel installation
- TH35 mounting rail reference shown in the dimensional drawing
- Multiple configurations for industrial electrical applications
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | RT18 Series Cylindrical Fuse Holders |
| Product Type | Cylindrical Fuse Holder |
| Series | RT18 |
| Rated Voltage | 500/690V |
| Rated Current | 20A / 32A / 63A |
| Compatible Fuse Sizes | 8.5×31.5mm / 10×38mm / 14×51mm |
| Indicator Options | With Indicator / Without Indicator |
| Mounting Reference | TH35 DIN Rail |
| Application | Low-Voltage Electrical Protection |
Dimension Figure
Available Models
The RT18 series includes five models with different fuse sizes, current ratings and indicator configurations.
| Model | Compatible Fuse Size (mm) | Rated Voltage (V) | Rated Current (A) | Indicator |
|---|---|---|---|---|
| RT18-20X | 8.5×31.5 | 500/690 | 20 | Yes |
| RT18-32 | 10×38 | 500/690 | 32 | No |
| RT18-32X | 10×38 | 500/690 | 32 | Yes |
| RT18-63 | 14×51 | 500/690 | 63 | No |
| RT18-63X | 14×51 | 500/690 | 63 | Yes |
Indicator and Non-Indicator Versions
RT18 fuse holders are available in two configurations:
- Standard version: Designed for conventional cylindrical fuse installation.
- Indicator version (X): Equipped with an indicator to help identify fuse operation.
The X suffix identifies the indicator-equipped version.
Overall Dimensions
The RT18 series features different mounting dimensions according to the compatible fuse size.
| Model | A1 (mm) | A2 (mm) | B (mm) | H1 (mm) | H2 (mm) |
|---|---|---|---|---|---|
| RT18-20X | 80 | 82 | 18 | 60 | 78 |
| RT18-32 | 79 | 81 | 18 | 61 | 80 |
| RT18-32X | 79 | 81 | 18 | 61 | 80 |
| RT18-63 | 103 | 105 | 27 | 80 | 110 |
| RT18-63X | 103 | 105 | 27 | 80 | 110 |
All dimensions are in millimeters (mm).
Applications
1. Low-Voltage Power Distribution
Used in distribution panels to accommodate compatible cylindrical fuse links for circuit protection.
2. Industrial Control Panels
Suitable for integration into industrial control cabinets and electrical control assemblies.
3. Electrical Equipment Protection
Provides a mounting solution for cartridge fuses used to protect electrical equipment against overcurrent conditions.
4. Industrial Electrical Installations
Suitable for electrical installations requiring compact cylindrical fuse holder configurations.
How to Select the Right RT18 Fuse Holder
Selecting the correct fuse holder requires checking the fuse dimensions, electrical ratings and installation requirements.
1. Confirm the Compatible Fuse Size
Choose between 8.5×31.5mm, 10×38mm and 14×51mm according to the cartridge fuse you intend to install.
2. Check the Rated Current
Select the appropriate 20A, 32A or 63A model according to the electrical system requirements.
3. Verify the Rated Voltage
Confirm that the holder’s rated voltage is suitable for the intended electrical installation.
4. Choose the Indicator Version
Select an X-marked model if a visual fuse status indicator is required.
5. Check the Mounting Dimensions
Verify the overall dimensions and mounting arrangement against your electrical panel design.
FAQ
What fuse sizes are compatible with RT18 cylindrical fuse holders?
The RT18 series supports three fuse sizes: 8.5×31.5mm, 10×38mm and 14×51mm, depending on the model.
What is the difference between RT18 and RT18X models?
The X suffix indicates that the fuse holder is equipped with an indicator. Standard models do not have this indicator feature.
What rated current options are available?
The series offers 20A, 32A and 63A rated current options.
What is the rated voltage of RT18 fuse holders?
The product specification lists rated voltage options of 500/690V.
How do I select the correct RT18 fuse holder?
Check the compatible fuse size, rated current, rated voltage and whether an indicator is required. Also verify the mounting dimensions before ordering.
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