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CB20: Circuit Breaker Finder/Receptacle Tester

Quickly Locate Circuit Breakers, Confirm Proper Wiring and Test GFCI Circuits

View Datasheet > CB20


Locate the correct circuit breaker or fuse without turning off the power with the Extech CB20 Circuit Breaker Finder, which employs automatic sensitivity to quickly and accurately pinpoint the correct 90-Volt to 120 VAC circuit breaker or fuse. The CB20 is ideal for a range of applications, including locating branch circuit breakers without causing accidental power shutoffs, confirming proper wiring during electrical installation or repair, and testing receptacle ground fault operation. Complete with Receiver, Transmitter, and 9V battery.

Additional information

Operating Voltage

90 to 120VAC

Operating Frequency

47 to 63Hz

Power supply

9V battery (receiver)

Operating Temperature

5ºC to 40ºC (41ºF to 104ºF)

Storage Temperature

‐20°C to 60° C (‐4° F to 140° F)

Storage Humidity


Operating Altitude

2000 meters (7000ft.) maximum


Transmitter: 91g (3.2oz) Receiver: 136g (4.8oz)


Transmitter: 118 x 60 x 35mm (4.6 x 2.4 x 1.4") Receiver: 196 x 55 x 36mm (7.7 x 2.2 x 1.4")

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