FEC AFC3000 - Circuit Protection

Chapter 4 Installation and Wiring
PAGE 4-24
4-4-1 Circuit Protection
● Rated Values for Calculating Circuit Protection for 200-230VAC 3 phase
MFC Type
Motor Type
Motor Wattage # of Spindles per KVA
KVA per Spindle
MFC-S024 RS1
70 8 Spindles .125 KVA
- -
- - -
MFC-S060 RS3
200 3 Spindles .333 KVA
-
- - -
MFC-S120 RM4
1500 2 Spindles .500 KVA
The chart above shows nominal motor ratings for standard motors, along with the power requirements
(200-230VAC 3 phase in KVA) for each spindle. (These already have a safety factor calculated in)
Use the formula below to compute transformer secondary fuse or circuit breaker sizing:
1.5 X
TRANSFORMER (VA)
SECONDARY VOLTAGE
.
. 3
=
SECONDARY FUSE SIZE
Example:
1.5 X
1000 (VA)
200 VAC
.
. 3 =
4.3 AMP (USE 5 AMP FUSES)*
* Use a fuse or circuit breaker with next available highest rating. Due to the high inrush current at power
up, it is recommended to use SLOW BLOW type fuses or fuses rated for motor loads such as
Bussman® FRS/FRN type.