Calculated Industries 5060 - Manual (Page 55)

User’s Guide — 53
Fuse and Circuit Breaker Size
What is the calculated dual element
and single element fuse size for a 230 volt,
3-phase, 50 HP induction motor? What are
the Instantaneous Trip and Inverse Time
Circuit Breaker require-ments?
Steps
Keystrokes Display
Clear calculator
o o
0.
Enter volts
230 U
VOLT 230.
Enter HP
50 h
IND 50. HP
Find full current
A
FLC 130. A
Find DE fuse size
D
AMPS 227.5 dE
Display % used
D
%FLC 175.
Find SE fuse size
S D
AMPS 390. SE
Display % used
D
%FLC 300.
Find inv. time brkr
I
AMPS 325. b2
Display % used
I
%FLC 250.
Find ins. trip
breaker sz.
S I AMPS 1,040. b1
Display % used
I
%FLC 800.
Starter Size
What NEMA size starter is required for
a 575 volt, 3Ø, 20 HP induction motor?
Steps Keystrokes Display
Clear calculator
o o
0.
Enter volts
575U VOLT 575.
Enter HP
20 h
IND 20. HP
Solve for
starter size
S h
STAR 2
SIZE