Grizzly Switch T20551 User Manual

Model T20551  
Magnetic Switch Instruction Sheet  
 
 
 
 
 
 
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Electrocution or fire could occur if this switch is  
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not installed by a qualified electrician!  
 
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MAGNETIC  
SWITCH  
ASSEMBLY  
 
 
 
 
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Contactor  
SHENDIAN  
MA-30  
 
 
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(220V Coil)  
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Thermal  
Overload Relay  
SHENDIAN  
RA-30  
 
 
 
 
 
 
(22-34A)  
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.  
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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.  
 

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