FTA902, 903, 952, 953 Separately Mounted Power Transfer Switch
Model Number Selection Guide
SEPARATELY MOUNTED FIRE PUMP POWER TRANSFER SWITCH
FTA902, 903, 952, 953 (Ex..FTA902-AL100B-75HP-E)
FTA ___ -A___ ___ ___ - ___HP-___
Options and Modifications
(See Back)
Transfer Switch Type
902 - Separately Mounted for generator
alternate source. Required disconnecting means and overcurrent protective devices for normal (utility) source
supplied by others.
903 - Separately mounted for generator alternate source. Required disconnecting means and overcurrent protective
devices for normal (utility) source are
supplied and integrally installed by
Firetrol.
952 - Separately mounted for second utility
alternate source. Required disconnecting means and overcurrent protective devices for normal (utility) source
supplied by others.
953 - Separately mounted for second utility
alternate source. Required disconnecting means and overcurrent protective devices for normal (utility) source
are supplied and integrally installed
by Firetrol.
See Back Page
Fire Pump
Horsepower Rating
03 05 07(7.5) 10 15 20
25 30 40 50 60 75 100
125 150 200 250 300 350
400 450 500 600 700
Three Phase Operating Voltage
A = 220-240V, 60Hz (230V)
AZ = 220-240V, 50Hz
B = 440-480V, 60Hz (460V)
BZ = 415V, 50Hz
C = 550-600V, 60Hz (575V)
F = 380V, 60Hz
FZ = 380V, 50Hz
H = 208V, 60Hz
HH = 200V, 60Hz
Transfer Switch Single Motor
Continuous Current Rating*
100 = 100A
150 = 150A
260 = 260A
400 = 400A
600 = 600A
800 = 800A
1000 = 1000A
*Sized based on motor FLA x 1.15
Type
902
903
952
953
Code
L
M
N
P
Q
R
M
N
P
Q
R
M
N
P
Q
R
Short Circuit Rating
Normal
Alternate
See Table 1
L
M
N
P
Q
R
See Table 1
See Table 1
See Table 1
See Table 1
See Table 1
M
N
P
Q
R
Table 1
Transfer Switch Rating Amps
100, 150
260, 400
600, 800
L
L
L
L
L
M
N
P
Q
R
M
N
P
Q
R
Generator Service
L - Standard short circuit rating
100-150A Transfer Switch
22,000A RMS Sym., 200-480V
250-400A Transfer Switch
35,000A RMS Sym., 200-480V
600-800A Transfer Switch
50,000A RMS Sym., 200-480V
100-800A Transfer Switch
10,000A RMS Sym., 550-600V
Utility Service
M - Standard short circuit rating
100,000A RMS Sym., 200-600V
N - Intermediate short circuit rating
150,000A RMS Sym., 200-600V
P - High short circuit rating
200,000A RMS Sym., 200-480V
Q - Standard Intermediate short circuit rating
65,000A RMS Sym., 200-480V
R - Standard Low short circuit rating
42,000A RMS Sym., 550-600V
UL1008 Withstand and Close-On Ratings @ 480VAC
“Any” Breaker
Current-Limiting Max. Fuse Size
Specific Breaker
Rating **
Fuse Rating
Rating **
Amps Types
200,000
**
J, L
22,000
10,000
200,000
**
J, L
42,000
35,000
200,000
**
J, L
65,000
50,000
** Overcurrent protection must be selected by fuses (or set by circuit breakers) to indefinitely carry the lockedrotor current of the fire pump motor per NFPA20, NPFA70 and UL218. For more information on transfer switch
withstand and close-on ratings, see ASCO publication 1128.
Options and Modifications
Special Enclosures
-T
NEMA Type 3R (IEC IP22), Painted Steel
-E
NEMA Type 4 (IEC IP66), Painted Steel
-F
NEMA Type 4X (IEC IP66), #304 Stainless
Steel, Natural Finish**
-FXP NEMA Type 4X (IEC IP66), #304 Stainless
Steel, Painted Finish
-FD
NEMA Type 4X (IEC IP66), #316 Stainless
Steel,Natural Finish**
-FDB NEMA Type 4X (IEC IP66), 12 Gauge, Seam
Welded, #316 Stainless Steel, Polished and
Brushed Finish
-FDP NEMA Type 4X (IEC IP66), #316 Stainless Steel
Painted Finish
-G
NEMA Type 12 (IEC IP54), Painted Steel
** Natural Finish (Not painted, polished, or brushed).
Anti-Condensation Space Heaters
-H 120 Volt Space Heater
-J 120 Volt Space Heater with Thermostat
-K 120 Volt Space Heater with Humidistat
-L 240 Volt Space Heater
-M 240 Volt Space Heater with Thermostat
-N 240 Volt Space Heater with Humidistat
Miscellaneous
-EC Extra contacts for remote indication, transfer switch
position
-S Tropicalization
Emerson Network Power - Global Headquarters
1050 Dearborn Drive
Columbus, OH 43085
Tel +1 614 888 0246
ASCO Power Technologies - Firetrol Brand Products
111 Corning Road, Suite 120
Cary, NC 27518
Tel +1 1 460 5200 … FaY +1 1 460 5250
EmersonNetworkPower.com
Firetrol.com
While every precaution has been taken to ensure accuracy and completeness herein, ASCO assumes no responsibility, and disclaims all liability, for damages resulting from use
of this information or for any errors or omissions. Information and specifications are subject to change without notice.
Emerson, Consider It Solved., Emerson Network Power, the Emerson Network Power Logo, ASCO, Firetrol and the Firetrol Logo are trademarks or registered trademarks of
Emerson Electric Co. All other names and logos referred to are trade names, trademarks, or registered trademarks of their respective owners. ©2013 Emerson Electric Co.
SD901-50 (A)