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These Springer Controls GMK motor protection switches are true manual motor starters.<br><br>
A model GMK motor protection switch is a three-pole horsepower-rated switch that combines motor thermal overload protection and magnetic short circuit protection in one compact unit.  The GMK series is ideal for applications requiring multi-motor protection; these starters can be group fused.  Any of these switches can be wired for single phase applications per the wiring diagram included in the box.
All GMK manual motor starters are specifically engineered with a comprehensive list of motor protection features.  These motor protection switches are available in a range from 0-32 amps.  All poles are open for both thermal and magnetic trips.  Easy operation with start and stop buttons maximize user control.  The GMK line features differential protection against asymmetrical overloads (single phase protection.)  All of these manual motor starters feature class 10 overload protection.  These starters sport ambient temperature compensation from 23 Fahrenheit – 104 Fahrenheit.  An instant magnetic trip activates when current through the relay is 12 times the maximum thermal setting.  The terminals of these starters are easily accessible yet protected from accidental contact.  All of these GMK switches are suitable up to 690V.<br><br>
Model GMK motor protection switches are designed for easy din-rail mounting.  Single switch enclosures specifically designed for these starters are also available from Global Industrial Equipment. 
All of these switches are UL listed, CSA approved, and meet international standards.  
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Springer Controls GMKO-N, Manual Motor Starter, 25.0-32.0 Amp, Mag. Trip 380 Amp

item-gmko-k-manual-motor-starter-type-gmk

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Springer Controls GMKO-K, Manual Motor Starter, 10.0-16.0 Amp, Mag. Trip 190 Amp