Kill switches: the automation rule nobody wants to need

[Fairman]

Kill switches: the automation rule nobody wants to need

An automated scalping system can lose money at astonishing speed when something goes wrong: a data glitch, a bug, a broker issue, or a change in market conditions. A kill switch is the circuit breaker that stops trading when behavior is abnormal.

Typical triggers include a maximum number of trades per hour, a maximum loss in a rolling window, a maximum spread, unexpected position size, repeated order rejections, or loss of data feed. Any of these should pause the system and send an alert.

Implementation can be in the EA itself, in a separate monitoring script, or on the broker's side through account-level limits. Redundancy is wise, since a bug in the EA may also affect its own safety logic.

Test the kill switch deliberately. Simulate conditions that should trigger it and confirm the response.

Many large losses in automated trading stem from systems running unchecked. A simple stop rule would have limited the damage.

Which kill switch conditions are built into the automated setup, and have they ever fired?