18 Questions
What is the maximum horsepower rating for most toggle-switch starters?
1 hp @ 230 V
At what voltage are most drum switches for single-phase motors rated up to 3 hp?
240 V
What is the maximum horsepower rating for push-button starters for single-phase motors?
5 hp @ 230 V
According to the manufacturer's chart, what is the Catalogue Number for a motor with a Full-load Current of 4.40 – 4.79?
GGH 5.5A
If a motor has a Full-load Current of 13.68 – 15.12, what is the corresponding Catalogue Number according to the chart?
GGH 17.1A
What is the horsepower rating for single-phase manual starting switches with Catalogue Number GGH.89A?
~1.67 hp
What is the maximum horsepower for a plugging & jogging-duty poly-phase motor for EEMAC size 2 at 480 volts?
25
In a motor controller, besides stopping and starting the motor, what is another function that a magnetic contactor can provide?
Overload protection
What distinguishes a magnetic contactor from a magnetic motor starter?
The magnetic starter includes an overload relay
What are the two basic components of a thermal overload relay?
Bimetallic strip and contacts
Is it necessary to have an overload in series with each of the line conductors to a three-phase motor?
No, it is not necessary due to inherent motor protection
What is the maximum horsepower for a nonplugging & nonjogging-duty poly-phase motor for EEMAC size 7 at 208-240 volts?
300
What is the purpose of low-voltage protection in equipment such as saws and lathes?
To prevent automatic restart after a loss of voltage or in a low-voltage situation
What three significant electrical ratings are important for manual motor starters?
Voltage, current, and horsepower
Why is it crucial for the voltage rating of a starter to match the operating voltage of the motor?
To avoid damaging the motor or starter
How is the ampacity rating of a starter typically related to the overload protection device?
It refers to the current drawn by the motor
Why is it important for the horsepower rating of a starter to meet or exceed the horsepower rating of the motor?
To protect against overloading the motor
What should be avoided when selecting a manual starter based on its horsepower rating?
Using a starter rated above the motor's horsepower at a lower voltage
Explore the different ratings and technical data for toggle-switch starters, drum switches, and push-button starters used with single-phase motors. Learn to select appropriate switches by understanding the manufacturer's rating information provided in catalogs.
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