How AISIKAI Circuit Breakers Manage Short-Circuit Stress from Impact to Interruption

Short-circuits are among the most destructive electrical faults in any low-voltage system.

Current surges can reach tens or even hundreds of times the rated current in just a few milliseconds—enough to deform metal, overheat components, and cause severe downtime.

AISIKAI circuit breakers are engineered to survive this extreme sequence through a verified and repeatable protection process we call the Fault Event Timeline.

This timeline illustrates the actual physical events taking place inside a circuit breaker—from the moment a fault arrives to the final interruption.

1. Fault Current Arrives

A large and sudden electrical surge rapidly approaches the breaker—similar to a high-energy wave hitting a barrier.

The first requirement for any breaker is simple:
Stay intact. Do not deform. Do not weld. Remain operational.

2. Ipk (Peak Withstand Current)

“Withstand the First Impact”

During the first few milliseconds of a short circuit, the system experiences a massive peak current known as Ipk.

This peak represents the highest mechanical force a circuit breaker will ever face.

AISIKAI enhances mechanical strength through:

• Reinforced copper-silver contacts

• High-rigidity moving arms

• Anti-welding contact design

• Optimized internal force-absorption structure

  
  

Objective:
Survive the mechanical shock without deformation or contact fusion.

This stage tests the physical strength of the breaker.

3. Icw (Short-Time Withstand Current)

“Endure the Heat”

After the initial impact, the fault current remains extremely high.
Protection relays evaluate the condition (0.0s → 0.5s → 1.0s).
During this time, the breaker experiences intense heating.

AISIKAI boosts thermal endurance with:

• Large-surface silver alloy contacts

• Heat-resistant DMC/SMC insulation

• High-conductivity metal structures

• Optimized thermal dissipation paths

Objective:
Withstand continuous heating for 0.5–1 second without melting, deforming, or losing insulation performance.

This is the breaker’s “thermal survival test”.

4. Icu / Ics (Breaking Capacity)

“Interrupt the Fault Safely and Restore Stability”

Once the relay issues a trip signal, the breaker opens its contacts and must extinguish the electrical arc efficiently.

AISIKAI applies advanced arc-control design:

• Multi-grid arc splitting chambers

• High-energy arc cooling channels

• Superior anti-erosion contact materials

• Fast separation mechanisms

Icu – Ultimate Breaking Capacity

Handles the maximum possible short-circuit once.
Designed for extreme fault levels.

Ics – Service Breaking Capacity

Handles real-world faults reliably and repeatedly.
After interruption, the breaker remains reusable and fully functional.

This final stage confirms the breaker can:

• Control the arc

• Interrupt the current

• Protect the system

• Return to a safe blue (normal) operating state

5. Why AISIKAI Circuit Breakers Deliver Superior Protection

AISIKAI breakers are engineered with industry-leading precision, delivering:

Structural Strength

• High Ipk performance

• Mechanical reinforcement in critical zones

Thermal Stability

• Optimized temperature distribution

• High-grade insulation and heat dissipation

Reliable Fault Interruption

• High Icu / Ics ratios

• Consistent arc control performance

Suitable for Professional Applications

• Generator sets

• Industrial distribution systems

• Data centers

• Switchgear OEMs

• Commercial power systems

AISIKAI products comply with and exceed IEC requirements, offering robust protection for global customers.

I am Frank, Electrical Engineer in AISIKAI Team. I will share technical articles on Switches, Circuit Breakers and other electrical devices. With 10 years of electric project experience, I am commited to provide professional electrical solutions.