Direct system
A heat-sensitive polymer tube runs inside the panel; at the point of fire the tube bursts and the suppressant is discharged right at that spot. No power supply, fully mechanical.

Most electrical fires start inside a panel. The smartest response is to stop the fire at its source — before it spreads into the room.
Working principle
A heat-sensitive polymer tube runs inside the panel; at the point of fire the tube bursts and the suppressant is discharged right at that spot. No power supply, fully mechanical.

The detection tube triggers, and discharge is delivered to the whole panel volume through a separate nozzle line — for larger panels and cabinets.

Use
The in-panel system is the first line of defense; for critical spaces, layered protection with room-type gaseous suppression is recommended.