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Crosses Below

Signals · Crossovers

Crosses Below node on the canvas

True on the bar where a crosses from >= b to < b.

Crosses Below fires a one-bar signal at the exact moment series A drops through series B — the bar where A goes from at-or-above B to below it. It's the mirror of Crosses Above, and it's the workhorse trigger for bearish crossover entries and exits: a fast moving average crossing under a slow one, RSI dropping back under 70, price falling through a level.

How it works

Each bar the block checks the relationship between A and B. It outputs true only on the transition bar — where A was ≥ B on the previous bar and is now < B. Every other bar (including all the bars where A simply stays below B) is false. That "only the crossing bar" behaviour is the whole point and the thing to internalise: Crosses Below is an event, not a state. A is the line doing the crossing (the fast MA, or RSI itself); B is the reference being crossed (the slow MA, or a threshold — wire a Constant for a fixed level).

When to use it

Use it for bearish triggers: fast-under-slow MA death crosses, momentum dropping back under a threshold, price losing a level. Because it fires once per crossing, it's perfect as a clean entry/exit pulse — you won't re-fire every bar while A stays below B. If instead you want "true the whole time A is below B," use Less Than; that's the state version.

Example

A momentum exit: feed an RSI line into A and a Constant of 70 into B; Crosses Below fires the single bar RSI falls back under 70 — route it to an Exit Long to take profit as momentum fades. Backtest in the Tester.

Tips & gotchas

  • It's an event, not a state. Fires once on the crossing bar — use Less Than for "while A < B".
  • Mind which input is which. A = the crosser, B = the reference. Swapping them inverts the meaning.
  • Use a Constant for thresholds — both inputs are series, so a fixed level needs a Constant wired into B.
  • Pairs with Crosses Above for the opposite trigger.

Inputs

Socket Type What to wire in
A series Left-hand series — the one DOING the crossing. In an MA crossover this is the FAST line (e.g. EMA-20). In an RSI trigger this is the RSI line itself.
B series Right-hand series — the REFERENCE being crossed. In an MA crossover this is the SLOW line (e.g. EMA-50). In an RSI trigger this is the threshold (e.g. constant 30).

Outputs

Output Type Plots as Description
Cross ↓ signal Signal arrows Bar where a crosses down through b

Reference auto-generated from the block catalog · category Signals.