33kV Silicone Combi Unit
Combined 33kV drop out fuse and surge arrester in one pole top unit
Product Overview
A combi unit puts the drop out fuse and the surge arrester into a single pole top assembly. Most transformer positions need both - one for the overcurrent from downstream, one for the overvoltage from the line - and combining them cuts the number of mounting points, the number of connections and the time a crew spends at height.
Key Benefits
- Overcurrent and overvoltage protection at one mounting position
- Fewer connections and mounting points per pole
- Silicone housings throughout for polluted environment service
- Shorter pole top working time per transformer position
Problems It Solves
- Two separate devices to mount connect and maintain at each position
- Inconsistent protection arrangements across a network
- Limited pole top space for separate fuse and arrester assemblies
Application Scenarios
- 33kV pole mounted transformer protection
- Positions where both fuse and arrester are required
- New installations where pole top space is limited
- Standardising transformer protection across a network
Who It Is For
- Distribution utilities protecting pole mounted transformers
- EPC contractors delivering transformer positions
- Rural electrification projects
- Maintenance departments standardising positions
Technical Features
- Combined drop out fuse and surge arrester functions
- Silicone rubber composite housings
- Rated at 33kV
- Single pole top mounting arrangement
Specifications
| Product Family | Silicon material |
|---|---|
| Rated Voltage | 33kV |
| Housing Material | Silicone rubber |
| Configuration | Fuse and arrester in one mounted unit |
| Function | Combined drop out fuse and surge arrester |
| Dimensions and Ratings | Confirmed against your line standard at quotation |
Materials
- Silicone rubber housings
- Composite insulating cores
- Arrester blocks and fuse carrier assembly
Manufacturing Process
- Core and block production
- Housing moulding
- Unit assembly
- Electrical and dimensional check
- Packing for export
Customisation Options
- Fuse ratings confirmed against your protection design
- Arrester rating confirmed against the system voltage and earthing arrangement
- Supplied as a standard transformer protection package across a project
Compared With Other Options
| Separate fuse and arrester | Separate devices give more mounting flexibility. A combi unit reduces the connections and the time at height. |
|---|---|
| 33kV silicone drop out fuse alone | Use the fuse alone where surge protection is provided elsewhere or is not required at that position. |
Use Guide
- Confirm both the fuse rating and the arrester rating before ordering
- Mount with the shortest practical earth lead from the arrester section
- Check the fuse carrier drops clear of the arrester and the structure
- Record the configuration installed at each position
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33kV Silicone Combi Unit Questions
Does a combi unit protect against both fault types
Yes - the fuse section clears downstream overcurrent and the arrester section conducts overvoltage surges to earth. They are different faults and both sections are needed.
Can the fuse section be replaced separately
Fuse links are replaceable in service. Confirm the link type in your enquiry so replacement stock matches.
Is an 11kV combi unit available
Send the requirement with your enquiry and we will confirm what is available at that class.
Get a Price on 33kV Silicone Combi Unit
Send the quantity, the specification you are matching and the destination port.