Circuit breakers are automatic trading halts triggered when market indices move beyond preset thresholds. When Nifty or Sensex falls by 10%, 15%, or 20% from the previous close, trading stops for a cooling-off period. They’re designed to prevent panic-driven crashes by giving market participants time to process information rationally.
- Automatic halts at 10%, 15%, and 20% index declines
- Halt duration: 15 minutes to full day depending on level and time
- Designed to prevent panic cascades
How Circuit Breakers Work
Circuit breakers trigger at specific thresholds:
Indian Index Circuit Breaker Levels:
10% Decline:
- Before 1:00 PM: 45-minute halt
- 1:00-2:30 PM: 15-minute halt
- After 2:30 PM: No halt
15% Decline:
- Before 1:00 PM: 1:45 halt
- 1:00-2:00 PM: 45-minute halt
- After 2:00 PM: Trading stops for day
20% Decline:
- Any time: Trading stops for the day
Note: Based on Nifty 50 or Sensex, whichever breaches first
Quick Reference: Circuit Breaker Matrix
| Trigger | Before 1 PM | 1-2 PM | 2-2:30 PM | After 2:30 PM |
|---|---|---|---|---|
| 10% | 45 min | 15 min | 15 min | No halt |
| 15% | 1:45 | 45 min | Rest of day | Rest of day |
| 20% | Rest of day | Rest of day | Rest of day | Rest of day |
Example: COVID Crash Circuit Breakers
March 2020 Events:
| Date | Trigger | Sensex | Action |
|---|---|---|---|
| Mar 12 | 10% | -2,919 | 45-min halt |
| Mar 13 | 10% | -2,704 | 45-min halt |
| Mar 23 | 10% | -3,934 | 45-min halt |
Context:
- Global pandemic panic
- Oil price war
- Fastest 30% decline in history
- Circuit breakers prevented worse cascades
Circuit breakers halt trading when indices fall 10%, 15%, or 20%. They prevent panic selling cascades by giving markets time to calm down. In India, halts range from 15 minutes to the full day depending on severity and timing.
Why Circuit Breakers Matter
Prevent Flash Crashes
Rapid algorithmic selling can cascade. Halts break the feedback loop.
Allow Information Processing
Major news takes time to digest. Halts let participants assess rationally.
Reduce Forced Liquidation
Margin calls during crashes force more selling. Halts reduce forced liquidation.
Restore Order
Market infrastructure can be overwhelmed. Halts let systems stabilize.
Circuit Breaker Criticisms
Magnet Effect
Traders rush to sell before halt triggers, accelerating the decline.
Delayed Price Discovery
Halts prevent markets from finding true equilibrium price.
False Sense of Security
Markets can still fall 20%—the halt doesn’t prevent losses.
Can Trap Traders
Those with open positions can’t exit during halts.
Trading Around Circuit Breakers
Don’t Panic
If circuit breaker triggers, use the pause to think, not react.
Assess Information
What caused the crash? Is it temporary or fundamental?
Check Your Positions
Review margin, stops, and exposure. Plan your next move.
Avoid Knee-Jerk Reactions
Post-halt moves can be violent both directions. Wait for clarity.
Common Mistakes
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Panic selling into halt – Adding to the cascade doesn’t help you.
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Buying immediately at reopen – Markets often continue lower.
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Ignoring the signal – Circuit breakers mean something major is happening.
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Over-leveraging – Can’t exit during halt; leverage kills.
How JournalPlus Logs Extreme Days
JournalPlus flags trades on circuit breaker days, helping you analyze how you perform during market crises versus normal conditions.
