Circuit Breaker
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 | “I can't get over how small you are!” This article is a stub. As such, it is not complete. You can help Portal wiki by expanding it. |
A Circuit Breaker helps to open doors in co-op mode, when pressed simultaneously with another Circuit Breaker located on the other side of a door. The Ping Tool's countdown function is useful for synchronizing the action with your partner. It is also used in Single player as a simple button to activate a object. A Circuit Breaker can be found at the start of 1950's testing to activate the power of the entrance and the lounge.