Posted by John T on January 04, 2013 at 19:11:54 from (216.249.82.117):
In Reply to: Sparkie Question posted by Eric in IL on January 04, 2013 at 15:23:18:
Eric, my very first electrical engineering job fresh out of Purdue in the late sixties was with Century Electric Motor Company, so I will try my best to "educate" you as you asked.
1) The purpose of a fuze orrrrrrrrrrrrr circuit breaker is to protect the branch circuit feeder wires from short circuit protection and overload. If you have a branch circuit that requires wire rated for 30 amps, then you use a 30 amp fuze or circuit breaker to PROTECT THE BRANCH CIRCUIT FEED WIRES...
2) Next if you use a motor you also want it protected against over current and overheat so to protect the MOTOR you use some sort of a thermal overload device which may be a device called a "thermal" or a "heater" in a starter or perhaps an internal thermal overload (red button you depress to reset)
3) The fuze or circuit breaker is to protect the BRANCH CIRCUIT FEED WIRES,,,,,,,,,The purpose of a thermal overload or heaters or thermals is to protect the MOTOR.
Perhaps what you heard refers to the engineering design fact that the branch circuit may be protected by EITHER a fuze or circuit breaker while the motor itself is protected by a device such as a heater or thermal which can melt open a link (if excess current) to protect the MOTOR i.e. you need BOTH branch circuit protection PLUS motor protection which is often a heater or thermal similar to a fuze in that a link actually melts and opens the circuit to prevent motor damage from excess current.
YOU NEED BOTH,,,,,,,BREAKER OR FUZE TO PROTECT THE BRANCH CIRCUIT FEED WIRES PLUSSSSSSS A THERMAL OVERLOAD DEVICE (heater or thermal acts like a fuze) TO PROTECT THE MOTOR
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
... [Read Article]
Latest Ad:
Oliver 550 Diesel runs like a watch three point hitch pto engine gone threw about two hundred hours ago nice clean tractor
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.