What is Circuit Breaker?

Indian market context (NSE)

Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Circuit Breaker shows up on Indian index, equity, and futures books — update to live quotes in your journal.

Nifty 50 perspective

Index-wide circuit halts on Nifty (10/15/20% moves) pause trading across NSE — your stop on 24,300 may not execute until reopen; model gap risk in plan.

Bank Nifty futures perspective

Individual stock circuits do not apply to Bank Nifty futures, but index circuits halt the contract — overnight NRML carries policy event risk.

How to validate

• Validate Circuit Breaker readings by session tag — open hour stats differ from midday.
• Check behaviour on gap-up/gap-down days separately on Nifty tags.
• Correlate with India VIX buckets (calm vs elevated) before changing rules.
• Confirm liquidity notes were filled on fast-market days.

How to track in TradeLyser

• Tag session phase and liquidity state on each trade influenced by Circuit Breaker.
• Daily journal: one line on market structure context (gap, range, trend).
• Filter analytics by session tag during monthly review.
• Note India VIX at session open when structure rules depend on volatility.

Best practices

• Pre-define how Circuit Breaker maps to session tags each quarter.
• Reduce size on expiry and event sessions when structure breaks.
• Journal gap days explicitly — averages hide gap risk.
• Align structure tags with India cash session hours (9:15–15:30).

Common pitfalls

• Applying midday rules to the opening 15 minutes without adjustment.
• Trading illiquid names with the same Circuit Breaker assumptions as Nifty.
• Forgetting overnight gap risk on “intraday” tags.
• Over-tagging — so many structure labels that review becomes noise.

How to use this in TradeLyser

Tag trades in circuit-hit names; note halt direction in event journal.