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1) FEATURES:

• UL Listed to both US and Canadian Standards
• One Year Limited Warranty
• Locates AC Breakers or Fuses
• No need to interrupt power
• Distinctive signal
• Audible and visual indication
• Does not interfere with sensitive electronic equipment

1.  Self-calibrating receiver with audible and visual indicators.
2.  Self-powered transmitter with audible and visual indicators.

2) PREPARATION FOR USE (figure 1):

1.  Install a 9-volt alkaline battery (battery not included).
2. Reinstall battery cover.
3. Test battery by turning on unit (rocker switch)
4.  L.E.D. will light brightly indicating the battery is in good condition.

3) TESTING THE TRANSMITTER AND RECEIVER (figure 2):

1.  Plug the transmitter into a powered electrical wall outlet.
2.  L.E.D will flash and beeper will sound at approximately seven times per second.
3.  Turn on receiver and place target on the tip against rear of transmitter (as shown).
4. Receiver L.E.D. will flash and beeper will sound in time with the 

transmitter.

5.  While continuing to hold receiver against rear of transmitter press 

and hold calibration switch.

6.  The receiver will stop responding with-in one to two seconds.
7.  Release calibration switch, receiver will again respond 

to the transmitter’s signal.

8.  This completes the test; turn off the receiver to reset the calibration circuit to full sensitivity.

4) LOCATING A CIRCUIT BREAKER (figure 3):

1.  With the transmitter plugged into an AC outlet to go the circuit breaker panel and open 

the cover.

2.  Turn on the receiver and place target on the tip firmly against the first circuit breaker in 

the panel.

3.  Press and hold the calibration switch while moving the receiver across the circuit breakers.

4.  When the receiver responds to a circuit breaker stop movement until the receiver stops 

responding, then continue moving the receiver to the next breaker.

5. During the calibration process the receiver may respond to more than one of the circuit 

breakers in the panel, each time this occurs wait for the receiver to stop responding before
moving to the next circuit breaker. 

6. After scanning all the circuit breakers in the panel release the calibration switch and rescan

the circuit breakers.

7.  Only one breaker will now produce a response in the receiver.
8.  While continuing to hold the receiver against this breaker turn off the breaker, this will 

remove power to the remote transmitter and the receiver will cease producing a response.
This confirms that the transmitter is no longer receiving power.

9.  Turn off receiver; additionally this resets the calibration circuit if 

another scan is desired.

10. Always confirm that power to the outlet has been removed by 

noting the absence of sound and light when in the presence of 
the transmitter.

11. Unplug transmitter when not in use.

5) OVERHEAD LIGHTING:

The circuit breakers controlling ceiling lights may also be identified 
by using a light socket adaptor or socket to clip lead adaptor such 
as the 

Sperry CSA-300A Adapter Set

(sold separately) as shown 

in figure 4.

6) SAFETY NOTE:

Since the routing of electrical wiring in the home can take many forms, it is possible for 
additional hot wires controlled by different circuit breakers to be present in the outlet box.  
Because of this possibility, it is recommended that an 

AC Voltage Sensor such as the 

Sperry Model VH-601A

(sold separately) be used to test for the presence of additional hot 

wires in the outlet box prior to performing any work inside the box. 

7) LIGHT DIMMERS:

High power light dimmers may interfere with the operation of the unit by giving a false 
response when scanning the circuit breaker panel.  The presence of such a light dimmer will 
produce a much higher flash and beep rate from the receiver compared to the normal rate of 
seven times per second.  It is recommended that any dimmers in operation be set to full 
power, or shut off when using the Circuit Breaker Finder.

8) SWITCH CONTROLED OUTLETS:

Because wall switches are sometimes used to control outlets, be sure to turn on these 
switches prior to plugging in the transmitter.

9) BATTERY LIFE:

While powered, the receiver will consume 10ma from the battery.  The L.E.D. in the receiver 
will rapidly become dim when the battery voltage drops below 8 volts and will completely 
extinguish at 7.5 volts.  Replace the battery when the L.E.D. fails to light or becomes 
noticeably dim.  Turn off receiver when not in use to prolong battery life. 

10) SPECIFICATIONS:

Working Voltage Range 80-140V max. to ground
Frequency: 50-60Hz
Operating Temperature: 32 to 122F(0-50C)
Storage Temperature: -4 to 158F(-20-70C)
Power Supply:

Receiver:  One (1) 9V Transistor Type Battery (NEDA #1604) Part # B-4 

Dimensions:

Transmitter: 3.3

H x 2.6

W x 1.1

D (83 x 67 x 28mm)

Receiver: 6.3

H x 3.4

W x 1.1

D (159 x 86 x32mm)

Weight:

Transmitter: 2.5 oz. (70g)
Receiver: 5.1 oz. (145g)

WARRANTY:

A.W. Sperry Instruments, Inc. warrants that this AWS instrument has been 

carefully tested, inspected, and warranted for one (1) year from the date of purchase by the
original end user purchaser, and the instrument has not been misused, damaged due to 
negligence, neglect or unauthorized repair, abused or used contrary to the operating 
instructions.  Instruments and proof of purchase in the form of a legible copy or original of the
sales receipt clearly identifying the distributor, model number and date of purchase must be
returned to A.W. Sperry Instruments, Inc. Attention: Customer Service Center, 2150 Joshua’s
Path, Suite 302, Hauppauge, NY 11788, Postage prepaid for examination of verification of 
manufacturing defect under warranty.  A.W. Sperry Instruments, Inc. shall be the sole judge 
of such defect. Liability of A.W. Sperry Instruments, Inc. shall be limited to the repair or
replacement at its sole option of any defective product.

INSTRUCCIONES DE OPERACIÓN

Modelo CS-550A

BUSCADOR DE INTERRUPTORES

FIG. 1

FIG. 2

FIG. 3

FIG. 4

1) CARACTERÍSTICAS:

• Registrado en UL tanto con las normas de EE.UU. como las de Canadá
• Garantía limitada de un año
• Localiza interruptores o fusibles de CA
• No es necesario cortar la electricidad
• Señal distintiva
• Indicación auditiva y visual
• No interfiere con equipos electrónicos sensibles

1.  Receptor autocalibrado con indicadores auditivos y visuales.
2.  Transmisor autónomo con indicadores auditivos y visuales.

2) PREPARACIÓN PARA EL USO (figura 1):

1.  Instale una batería alcalina de 9 voltios (no se incluye).
2.  Vuelva a colocar la cubierta de la batería.
3.  Pruebe la batería encendiendo la unidad (interruptor basculante)
4.  El LED se iluminará indicando que la batería está en buenas condiciones.

3) PRUEBA DEL TRANSMISOR Y EL RECEPTOR (figura 2):

1.  Enchufe el transmisor en un tomacorriente energizado.
2.  El LED destellará y sonará una alerta sonora a 

aproximadamente siete veces por segundo.

3.  Encienda el receptor y coloque el objetivo en la punta 

contra la parte trasera del transmisor (como se muestra).

4.  El LED del receptor destellará y la alerta sonora sonará sincronizada con el transmisor.
5.  Mientras sostiene el receptor contra la parte trasera del 

transmisor, presione y sostenga el interruptor de calibración.

6.  El receptor dejará de responder en uno o dos segundos.
7.  Suelte el interruptor de calibración; el receptor responderá nuevamente a la señal del 

transmisor.

8.  Esta acción da por terminada la prueba; apague el receptor para restablecer la 

sensibilidad completa en el circuito de calibración.

4) LOCALIZACIÓN DE UN INTERRUPTOR (figura 3):

1.  Con el transmisor enchufado en un tomacorriente de CA, vaya al panel de interruptores y 

abra la cubierta.

2.  Encienda el receptor y coloque el objetivo sobre la punta firmemente contra el primer 

interruptor del panel.

FIG. 1

FIG. 2

A.W. SPERRY INSTRUMENTS INC.

The Professional’s Choice™

2150 JOSHUA’S PATH, SUITE 302, HAUPPAUGE, NY 11788

Phone:1-800-645-5398 Toll Free or 1-631-231-7050

Fax:1-631-434-3128

Email: [email protected]      www.awsperry.com

A.W. SPERRY INSTRUMENTS INC.

The Professional’s Choice™

2150 JOSHUA’S PATH, SUITE 302, HAUPPAUGE, NY 11788

Phone:1-800-645-5398 Toll Free or 1-631-231-7050

Fax:1-631-434-3128

Email: [email protected]      www.awsperry.com

OPERATING INSTRUCTIONS

Model CS-550A

CIRCUIT BREAKER FINDER

*CS-550A OPER INSTR  8/8/05  6:03 PM  Page 1

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