Electric Motor Control Basics - Book - Page 49
The Benefits of Type E/F Motor Protection Circuit Breakershe
The Type E manual, self-protected combination motor controller was tested with
a Series 300 Contactor creating a Series 630 Direct-On-Line Starter, providing the
customer with the option to take advantage of the contactor’s extended switching life,
while simultaneously achieving the required motor disconnect capability and short
Part 1, Contactors
Type F construction is very similar to Type E with the following exceptions:
Basics: Part 3,
Type E vs. Type F
The entire assembly is self-protected.
Same combination kA ratings as Type E.
There is a separate set of short circuit and endurance
performance tests just for Type E self-protected
Only the manual motor starter is
The entire assembly is subjected to the Type E short
circuit and endurance performance tests.
The contactor is not subjected to the Type E short circuit
and endurance performance tests.
Since the contactor is not part of the self-protected test, the Type F combination motor
controller will clear a short and protect equipment and operators, but the device may
not be operational immediately after a fault occurs.
Basics: Part 2,
The Benefits of Type E/F
Basic Pump Control:
Three Phase DOL Starter
Control of an Electric Pump
Applying Motor Control
in a Wastewater
NEMA vs IEC Motor