Automation Direct Stellar SR55 Series, User Manual

Page: 24 / 202

Page 2–4 Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
Chapter 2: Electrical Installation
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External Short-Circuit Protection Required for SR55
SR55 Model Number
SR55
-017
SR55
-021
SR55
-027
SR55
-034
SR55
-040
SR55
-052
SR55
-065
SR55
-077
SR55
-096
Rated Operational Current
UL FLC (A) 17 21 27 34 40 52 65 77 96
IEC I
e
(A) 17 22 29 35 41 55 66 80 100
Semiconductor Fuse
(class aR)
#1
Type
Mersen 6,9 URD 30xx
Bussmann 170M30xx
Bussmann 170M31xx
Bussmann 170M32xx
SIBA 20 61xx
Rating (A)
100 100 160 160 160 200 200 250 315
Class J High-Speed
Current-Limiting Fuse
#2
Rating
Z
1
(A) 30 45 60 70 90 110 125 150 175
Class J Time-Delay Fuse
#3
Rating
Z
2
(A)
30 40 50 60 70 100 125 150 175
UL Listed Inverse Time-
Delay Circuit Breaker
#3
Rating
Z
3
(A)
60 60 60 60 60 150 150 250 300
Rated Conditional Short-
Circuit Current
I
q
(kA)
5 10
SR55 Model Number
SR55
-124
SR55
-156
SR55
-180
SR55
-242
SR55
-302
SR55
-361
SR55
-414
SR55
-477
–
Rated Operational Current
UL FLC (A)
124 156 180 242 302 361 414 477
–
IEC I
e
(A)
132 160 195 242 302 361 430 500
Semiconductor Fuse
(class aR)
#1
Type
Mersen 6,9 URD 31xx
Bussmann 170M40xx
Bussmann 170M41xx
Bussmann 170M42xx
SIBA 20 61xx
Mersen 6,9 URD 33xx
Bussmann 170M60xx
Bussmann 170M61xx
Bussmann 170M62xx
SIBA 20 63xx
Rating (A) 400 550 550 700 800 900 1000 1100
Class J High-Speed
Current-Limiting Fuse
#2
Rating
Z
1
250 350 400 500 600 600 n/a
Class J Time-Delay Fuse
#3
Rating
Z
2
(A) 225 300 350 450 500 500 600 600
UL Listed Inverse Time-
Delay Circuit Breaker
#3
Rating
Z
3
(A) 350 450 500 700 800 1000 1000 1000
Rated Conditional Short-
Circuit Current
I
q
(kA)
10 18
#1 Correctly selected semiconductor fuses can provide additional protection against damage to the SR55 unit (this
is sometimes referred to as type 2 coordination). These semiconductor fuses are recommended to provide this
increased protection.
#2 Suitable for use in a circuit capable of delivering not more than I
q
rms Symmetrical Amperes, when protected by
Class J high-speed current-limiting 600V rated fuses with a maximum trip rating of Z
1
(IEC Type 1 coordination
short-circuit protection).
#3 Suitable for use in a circuit capable of delivering not more than I
q
rms Symmetrical Amperes, 480 Volts
maximum, when protected by Class J time-delay fuses with a maximum rating of Z
2
, or by a circuit breaker with
an interrupting rating not less than Z
3
rms Symmetrical Amperes, 480 Volts maximum as in table.