Peripheral Devices E - 2
Branch Circuit Short Circuit Protection
The following peripheral devices may be required between the AC main circuit power supply and the Drive input
terminals L1(R), L2(S), and L3(T). Refer to applicable codes to determine the devices necessary for a given
installation. Use Table E.1 or E.2 when selecting fuses and circuit breakers per the NEC. When selecting
semiconductor fuses to provide Drive input I
2
t protection and comply with UL, CSA, NEC, and CEC branch circuit
short circuit protection requirements, select one of the fuses in Table E.3 or E.4.
Fuse Type:
UL designated Time-Delay or Non-Time-Delay Fuse
Class:
CC, J, T, RK1 or RK5
Designators (typical):KTK, FNQ, FRS, LPJ, LPS, JKS, JJN, or JJS
Voltage Rating:
250V for Drives with 208V input
600V for Drives with 480V input
Circuit Breaker Type:
Inverse Time (MCCB) or Instantaneous Trip (MCP)
Voltage Rating: 600V
Table E.1 Recommended Fuse and Circuit Breaker Ratings per NEC (208 Vac Input)
Model
CIMR-E7U
Hp
Input
Amps
*1
(Continuous
Rating)
Output
Amps
*1
(Continuous
Rating)
Fuse
Selection Criteria
Circuit Breaker
Selection Criteria
Maximum
Time-Delay
Fuse Rating (A)
Maximum
Non-Time-Delay
Fuse Rating (A)
Maximum CB
Rating (A)
20P4
0.5/0.75
4.3
3.6
6
12
15
20P7
1
5.5
4.6
8
12
15
21P5
1.5/2
9.4
7.8
15
15
15
22P2
3
13
10.8
20
20
20
23P7
5
20
16.8
30
30
35
25P5
7.5
24
23
40
50
45
27P5
10
37
31
60
80
80
2011
15
53
46.2
80
80
100
2015
20
70
59.4
110
125
125
2018
25
89
74.8
125
150
150
*1 Input and Output Amps are based on the Normal Duty (ND) current rating. Consult the Specification section for details on the Heavy Duty (HD) and Normal Duty (ND) ratings.
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