chassis truck is primarily designed to support circuit breakers, transformers, and other components in withdrawable switchgear. It facilitates the pushing and extraction of the chassis. As an auxiliary operation, it connects components and busbars. When operated with the internal mechanism of the circuit breaker and the interlock mechanism of the mid-placed cabinet, it meets the interlock requirements of the “5 Preventions” stipulated in GB3906. The specific functions are as follows:
The circuit breaker can only be closed when the handcart is in the testing, isolating, or working position. When the handcart is in the locked state, this prevents misconnection and mismatched isolation contacts with the load.
If the handcart is in the working position or moves 110mm away from the testing/isolating position, the earthing switch fails to close, thus avoiding unintentional operation of the switch.
When the earthing switch is closed, the handcart cannot shift from the testing/isolating position to the working position, preventing the circuit breaker from closing inadvertently.
Once the chassis enters the cabinet and moves away from the testing/isolating position, the handcart cannot be drawn out of the cabinet.
Note: There are five types of lock plates available for selection. The standard specification is 8B.141.012. If you require any of the other four lock plates, please specify your choice when placing the order.
| Product Type | A | B | C | D | E | F |
| DPC-4-650 | 500 | 450 | 410 | 385 13×30 | 502 | 535 |
| DPC-4A-650 | ||||||
| DPC-4-800 | 650 | 600 | 560 | 520 | 652 | 685 |
| DPC-4A-800 |
The DPC-4A/4A chassis truck is a precision-engineered component designed for KYN28A high voltage switchgear. It is specifically manufactured to facilitate VD4 breaker mounting, offering mid door interlock functionality and reliable earthing contacts. The chassis truck ensures secure insertion and withdrawal of breakers while maintaining operational safety and switchgear efficiency.
This article provides a comprehensive overview of the product, including maintenance methods, usage recommendations, fault analysis, and troubleshooting, all optimized for Google SEO and suitable for official websites, B2B platforms, and technical documentation.
Rated for KYN28A switchgear applications.
Compatible with VD4 breaker systems.
Ensures Safe Operation in 12kV–40.5kV environments (depending on switchgear configuration).
Provides safe grounding during breaker insertion and withdrawal.
Reduces the risk of electrical accidents.
Durable contact design ensures long-term reliability.
Enhances operational safety.
Prevents access when the breaker is engaged.
Reduces mechanical damage risk during maintenance.
Smooth roller and guide systems.
Accurate alignment for switchgear breakers.
Minimal operational friction ensures long service life.
| Parameter | Specification |
|---|---|
| Model | DPC-4A/4A |
| Compatible Switchgear | KYN28A |
| Breaker Type | VD4 |
| Rated Voltage | 12kV / 24kV / 40.5kV (depending on system) |
| Rated Current | Up to 4000A |
| Earthing Contacts | Yes, integrated |
| Mid Door Interlock | Yes |
| Material | High-strength steel, epoxy-coated parts |
| Operation Temperature | -25°C to 55°C |
| Installation Mode | Chassis-mounted, roll-in / roll-out |
Ensure the breaker is fully disconnected from the power source.
Verify earthing contacts are engaged.
Align chassis truck with rails before rolling in the VD4 breaker.
Use smooth, steady motion to avoid mechanical stress.
Always wear insulated gloves and protective equipment.
Confirm mid door interlock is functional before operation.
Check for obstructions or debris in switchgear rails.
Avoid exceeding rated voltage and current parameters.
Perform visual inspections before each use.
Lubricate rolling components every six months.
Replace worn or damaged earthing contacts promptly.
Ensure all interlocks operate smoothly.
Inspect chassis truck wheels and guides for wear.
Check earthing contacts for corrosion or loose connections.
Clean chassis surfaces using non-abrasive, non-conductive cleaners.
Verify mid door interlock functionality monthly.
| Component | Maintenance Frequency | Maintenance Method |
|---|---|---|
| Wheels & Rollers | Every 3 months | Lubricate with dielectric grease, check alignment |
| Earthing Contacts | Every 6 months | Clean, tighten screws, inspect for wear |
| Mid Door Interlock | Monthly | Test operation, adjust spring tension if needed |
| Chassis Frame | Annually | Inspect for corrosion or damage |
Store chassis trucks in dry, ventilated areas.
Avoid exposure to moisture and corrosive environments.
Use protective covers to prevent dust accumulation.
Breaker Not Inserting Properly
Misalignment of chassis rails.
Worn rollers or guides.
Debris obstructing track.
Earthing Contacts Malfunction
Corrosion or oxidation.
Loose screws or connectors.
Mechanical deformation.
Mid Door Interlock Failure
Broken interlock spring.
Misalignment due to mechanical stress.
Accumulated dust or dirt.
| Fault | Possible Cause | Recommended Action |
|---|---|---|
| Breaker jammed during insertion | Misaligned rails, debris | Realign rails, clean track |
| Earthing contacts not engaging | Corrosion, loose connection | Clean, tighten screws, replace if needed |
| Interlock does not operate | Broken spring, dirt accumulation | Replace spring, clean mechanism |
Check for loose bolts, worn wheels, and corrosion.
Identify damaged components or misalignment.
Remove defective rollers or earthing contacts.
Replace with OEM-certified parts.
Verify mid door interlock alignment.
Insert and withdraw the breaker slowly.
Ensure earthing contacts engage fully.
Confirm interlock prevents door opening when breaker is inserted.
Record maintenance and repair actions.
Note replacement parts and operational tests.
Maintain log for future troubleshooting.
Train operators in proper insertion and withdrawal procedures.
Implement a regular maintenance schedule.
Use original parts for replacement to ensure compatibility.
Maintain clear access to chassis rails and breaker pathways.
Conduct periodic functional testing for safety verification.
Chassis truck components are designed with eco-friendly materials.
Coatings and insulation materials comply with international environmental standards.
Minimal lubricant usage reduces chemical waste.
Packaging is recyclable, reducing operational environmental footprint.
High Reliability: Robust design ensures long service life in high voltage environments.
Safety Compliance: Mid door interlock and earthing contacts enhance operational safety.
Ease of Maintenance: Modular design simplifies inspection and repair.
Precision Engineering: Accurate alignment for consistent breaker insertion and withdrawal.
Cost Efficiency: Durable materials reduce downtime and replacement costs.
The DPC-4A/4A Chassis Truck for KYN28A switchgear with VD4 breaker mounting provides a reliable, safe, and efficient solution for high voltage applications. With integrated earthing contacts and mid door interlock, it ensures operational safety, ease of maintenance, and long-term durability. Proper usage, regular maintenance, and timely troubleshooting are essential to maximizing performance and operational life.
Phone: +8613736779975
E-mail: sales@vcbbreaker.com
Address: 66 Punan Road, Yueqing Economic Development Zone, Zhejiang, China
Copyright © 2025 Yangmei Electric Group All rights reserved
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