| 摘要 |
A system for locating a particular circuit breaker (10-15) associated with a branch circuit (20-25). The system includes a transmitter (31, 35), which is connected to the hot lead (20a) of the branch circuit (20-25), for injecting a signal having a predetermined frequency, and identification circuits (100) permanently associated with each circuit breaker (10-15). Each identificatio n circuit (100) includes a controlled switch (130) in series with an indicator lamp (101) which is powered by a rectifier (110) connected to the hot lead (20a) of the associated branch circuit (20). A band pass filter (120) passes the predetermined frequency, which biases the gate (131) of the controlled switch (130) when the predetermined frequency is present on the hot lead (20a), thereby turning the indicator lamp (101) on. Each identification circuit may also include a low pass filter (140) for blocking the predetermined frequency signal from being distributed via a bus bar (16) int o the identification circuits associated with other branch circuits.
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