Products
12kV Withdrawable Vacuum Load Switch-Fuse Combination
Choose TaiLi Electric withdrawable vacuum load switch-fuse combination for cost-effective 12kV transformer and motor protection. TaiLi Electric combination unit fits 550mm switchgear, offering fast short-circuit interruption via fuses with visible isolation – the economical alternative to circuit breakers.
For transformer and motor protection in 12kV distribution networks,this combination unit delivers equivalent protection at 40–60% of the cost of a full vacuum circuit breaker.
Here is the practical difference:
- Circuit breakers handle everything – load switching, short-circuit interruption, and fault clearing – but you pay for that full capability even if you rarely need it.
- This combination unit uses a load switch for routine load making/breaking and current-limiting fuses for short-circuit protection. The result? You get the protection you actually need, without overpaying for capability you do not use.
When does this matter most?
- Transformer feeders (≤160A typical)
- High-voltage motor starters
- Arc-suppression coil protection
- Applications where short circuits are infrequent but must be cleared fast
How Protection Works
Normal operation– The vacuum load switch handles up to 630A of load current for routine switching.
Short-circuit event– The current-limiting fuse operates within 2–5ms. A striker mechanism simultaneously trips the load switch, clearing all three phases and creating a visible isolation gap – eliminating single-phasing risk.
Maintenance– The fuses can be replaced from the front panel without removing the entire handcart.
What You Get
|
Feature |
Benefit |
|
550mm cabinet fit |
Same footprint as VS1 circuit breaker handcarts – direct swap, no cabinet modification |
|
Three-position switch (closed/open/earthed) |
Built-in earthing for safe maintenance |
|
Visible isolation gap |
Clear physical disconnection visible to the operator |
|
Striker trip mechanism |
All three phases clear simultaneously – no single-phasing |
|
Front-access fuse replacement |
No need to withdraw the entire handcart for fuse changes |
|
10,000 mechanical operations |
Suitable for frequent load switching |
|
Partial discharge ≤5pC |
Superior insulation quality, extended service life |
Technical Specifications
|
Parameter |
Value |
|
Rated voltage |
12 kV |
|
Rated frequency |
50 Hz |
|
Rated load switch current |
630 A |
|
Fuse rating range |
Up to 125 A |
|
Fuse breaking capacity |
Up to 50 kA |
|
Switching of no-load transformers |
1250kVA |
|
Mechanical endurance |
10,000 operations |
|
Partial discharge |
≤5 pC |
|
Phase spacing |
150mm / 210mm / 275mm (options) |
|
Cabinet width compatibility |
650mm / 800mm / 1000mm |
FAQ
Q1: Can this combination unit handle frequent short-circuit interruptions?
A: The load switch itself handles load switching. For short-circuit duty, the fuses are sacrificial components – they operate once and must be replaced. If your application experiences frequent short circuits (e.g., 3+ per year), a circuit breaker may be a better long-term investment. For normal distribution feeders where short circuits are rare, this combination unit is the cost-effective choice.
Q2: What happens if only one fuse operates?
A: The striker mechanism on each fuse is mechanically linked – when any fuse operates, it triggers the load switch to open all three phases simultaneously. This prevents single-phasing and protects connected equipment.
Q3: How quickly does the combination interrupt a short circuit?
A: The fuse operates in 2–5ms. The striker mechanism then trips the load switch. Total clearing time is significantly faster than most circuit breaker installations.
Q4: Can I use any brand of fuse with this handcart?
A: The combination unit is designed for industry-standard fuse sizes. We recommend using fuses from reputable manufacturers to ensure consistent striker performance and timing.
Q5: Does this unit fit into an existing VS1 breaker position?
A: Yes. The handcart has the same external dimensions as a VS1 circuit breaker handcart. You can roll it into the same 550mm compartment without any cabinet modification.
Hot Tags: 12kV Withdrawable Vacuum Load Switch-Fuse Combination, China, Manufacturer, Supplier, Factory
Related Category
Send Inquiry
Contact Info
-
Address
No.81, Jingsan Road, Economic Development Zone, Yueqing City, Zhejiang Province, China
-
Tel
-
E-mail
For inquiries about transformer, switchgear, medium voltage circuit breaker or price list, please leave your email to us and we will be in touch within 24 hours.
