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Market Structure
Level 1, 2, and 3 Circuit Breakers Explained
Three thresholds, three responses, one goal: stop a crash from feeding on itself. Here’s exactly what each level triggers.
NoVo Options Trading · 2026
Educational only, not financial advice. Market rules and thresholds can change — verify current specifics with the exchanges or your broker.
The three market-wide circuit breaker levels — 7%, 13%, and 20% single-day S&P 500 declines — trigger progressively longer halts. Here’s exactly what each does.
The three levels
Level 1 (−7%): if hit before 3:25pm ET, a 15-minute market-wide halt; at/after 3:25pm, no halt. Level 2 (−13%): same rule — 15-minute halt before 3:25pm, none after. Level 3 (−20%): at any time, trading halts for the rest of the day. Each level is measured from the prior day’s S&P close.
The logic of the timing rule
Levels 1 and 2 don’t halt after 3:25pm because there’s little session left — a pause would just delay the inevitable close. Level 3 halts anytime because a 20% single-day crash is catastrophic enough to stop trading entirely and reset overnight. The escalating severity matches the escalating decline.
7% and 13% buy a 15-minute timeout (before 3:25pm); 20% ends the day. Progressive brakes for a progressively worse crash.
What it means for a scalper
If a halt hits while you’re in a 0DTE position, you’re frozen — you can’t exit until trading resumes, and it may reopen at a very different price. That’s a real tail risk on a crash day, and a reason risk controls and defined-risk long options (max loss = premium) matter. These events are rare, but knowing the mechanics keeps you calm if one occurs.
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.