How to Set a Short Delay on a Breaker

The electrical system's breakers are the main safety devices in the system. Their job is to prevent excessive current from being drawn into the branch wires and damaging them. They do this by monitoring current in the wire, and if an over-current situation arises, opening to shut down the power. In some situations, it is necessary to have a short time delay -- or STD -- on the breaker. This allows a excessive current in the wires for a very limited time before opening.

Non-contact voltage detector
STD replacement breaker
Screwdriver

Instructions

- 1
  Turn off the power to the electrical panel by opening the main breaker. Confirm the power is off by touching a non-contact voltage detector to several wire's insulation. Double-check the power is off by looking to see if any lights or devices have power in the home.
- 2
  Remove the screws that fasten the cover on the electrical panel, and set aside the cover.
- 3
  Loosen the electrical terminal on the breaker you want to change, and pull out the wire.
- 4
  Remove the breaker from the panel by prying it up. This is done by laying a screwdriver down the center of the breakers. Insert another screwdriver into the side of the breaker closest to the middle of the panel, and use the other screwdriver as a lever to pry it out of its slot.
- 5
  Install the STD breaker into the same slot by inserting it into the center first, then pushing down on the outside until it clicks into place. Give the breaker a gentle wiggle to assure it is locked into the panel.
- 6
  Loosen the terminal on the STD breaker, and insert the wire from the old breaker. Tighten the terminal down.
- 7
  Install the cover on the electrical panel, then turn the power back on.

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