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Model G4674
Magnetic Switch Instruction Sheet
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IMPORTANT: This magnetic switch toggles a motor ON and OFF, and helps provide thermal overload protection for the motor if operating temperature gradually increases due to heavy work loads. The thermal overload relay inside is not designed to cut power in the event of a sudden motor overload or stall.
To help protect a motor from this type of overload, this magnetic switch MUST be connected to a properly sized power supply circuit with a correct fuse or circuit breaker.
OPERATION: The green push button switch allows current to go to the magnetic coil which pulls the contactor closed. Main current now passes through the thermal overload relay and then to the motor. This relay monitors motor current draw. If the motor begins to overheat, this relay breaks the magnetic field, which opens the contactor and cuts current to the motor. The red push button breaks the magnetic field, which opens the contactor and disconnects the current to the motor.
Thermal Relay Overload
Amp Adjustment Dial:
Turn this dial to meet your motor manufacturer's thermal overload amp setting speci???cation. Typically this setting is 100-110% of what is
listed on the motor data plate as the max amp load. Remember, turning this dial has no effect on increasing motor horsepower.
If this dial is turned to an amp setting that is too high, the motor can overheat and be damaged before the relay trips.
Trip Indicator: If the window is ???agged yellow, the thermal relay has tripped.
Manual Contactor Override Lug:
When pushed, the contactor is manually closed for troubleshooting purposes only.
ON Button:
When pushed, power is sent to the magnetic ???eld coil and the contactor closes and 
sends power to the motor.
Manual/Auto Reset Lever:
In the up position, the thermal relay is in manual reset mode, where if tripped, you must ???rst push the
red and then the green ON button reset button on the outside of the main cover to reset the thermal relay. In the down position, the thermal relay will automatically reset when it
Manual Trip Test Lever:
If the thermal relay function
is in question, use a wooden 
toothpick to slide the yellow test lever to the left. If the motor
shuts off, the thermal relay has tripped and is functional.
OFF Button:
When pushed, the current going to the magnetic ???eld coil is cut, which opens the contactor and cuts power to the motor.
Parts Breakdown
has cooled.
Reset Button:
When pushed, the thermal relay is reset and the yellow ???ag shown in the trip indicator window is cleared.
6P4571006 CONTACTOR RETAINER
COPYRIGHT ?? JANUARY, 2008 BY GRIZZLY INDUSTRIAL, INC. WARNING: NO PORTION OF THIS MANUAL MAY BE
REPRODUCED IN ANY SHAPE OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#CR10360 PRINTED IN TAIWAN
