MOTOR PROTECTION

MOTOR PROTECTION
CLASS CC/CD
Selection of POWR-PRO® Class CC/CD (CCMR Series) Fuses
Based on Motor Full Load Amps
1
2
3
For Motors With An Acceleration Time of
2 Seconds or Less
For Motors With An Acceleration Time of
5 Seconds or Less
Min. F.L.A.¹
0.2
0.3
0.4
0.5
0.6
0.8
0.9
1.1
1.2
1.5
1.8
2.1
2.3
2.6
2.9
3.3
3.5
3.6
4.1
4.3
4.6
5.2
5.8
6.9
8.9
11.5
14.3
20.7
23.7
26.6
30.0
35.5
Min. F.L.A.¹
0.2
0.3
0.4
0.5
0.6
0.8
0.9
1.1
1.2
1.5
1.8
2.1
2.3
2.6
2.9
3.3
3.5
3.6
4.1
4.3
4.6
5.2
5.8
6.9
8.9
11.2²
13.4²
16.1
18.4
20.7
23.0
27.6
Max. F.L.A.³
0.2
0.4
0.6
0.7
1.0
1.1
1.3
1.4
2.1
2.6
3.0
3.4
3.9
4.3
4.8
5.2
5.4
5.7
5.8
6.2
6.9
7.7
8.9
10.0
13.5
15.8
17.8
23.3
26.7
30.0
33.3
40.0
CCMR Rating
3/10
1/2
8/10
1
1-1/4
1-1/2
1-8/10
2
2-1/2
3
3-1/2
4
4-1/2
5
5-6/10
6
6-1/4
7
7-1/2
8
9
10
12
15
20
25
30
35
40
45
50
60
Max. F.L.A.³
0.2
0.4
0.5
0.6
0.9
1.0
1.1
1.2
2.1
2.6
3.0
3.2
3.3
3.4
3.7
4.0
4.1
4.2
4.3
4.6
5.2
5.8
6.6
7.7
10.0
11.8
13.4
17.9
20.5
23.1
25.6
30.1
CCMR Rating
3/10
1/2
8/10
1
1-1/4
1-1/2
1-8/10
2
2-1/2
3
3-1/2
4
4-1/2
5
5-6/10
6
6-1/4
7
7-1/2
8
9
10
12
15
20
25
30
35
40
45
50
60
Based on NEC® requirement limiting the rating of time-delay fuses to 175% of motor F.L.A., or next higher rating.
Based on NEC® exception permitting fuse rating to be increased, but not to exceed, 225% motor F.L.A. However per
NEC® Article 430.152, Class CC (0-30) fuses can now be sized up to 400% of motor F.L.A.
Based on Littelfuse CCMR time-delay characteristics.
www.littelfuse.com
800-TEC-FUSE
MOTOR PROTECTION
TA B L E S
Selection of POWR-PRO® Class CC/CD (CCMR Series) Fuses
Based on Motor Full Load Amps
2
3
For Motors With An Acceleration Time of
8 Seconds or Less
For Motors With An Acceleration Time of
8 Seconds or Less
Min. F.L.A.²
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.2
1.4
1.6
1.8
2.0
2.3
2.5
2.7
Min. F.L.A.²
2.8
3.2
3.4
3.6
4.0
4.5
5.4
6.7
6.8
9.0
10.0
15.6
17.8
20.0
22.3
26.7
Max. F.L.A.³
0.2
0.3
0.5
0.6
0.8
0.9
1.0
1.1
1.8
2.3
2.6
2.8
2.8
2.8
3.1
3.4
CCMR Rating
3/10
1/2
8/10
1
1-1/4
1-1/2
1-8/10
2
2-1/2
3
3-1/2
4
4-1/2
5
5-6/10
6
Max. F.L.A.³
3.5
3.7
3.8
4.2
4.5
4.9
5.5
6.7
9.0
11.0
15.0
15.9
18.2
20.4
22.7
27.3
CCMR Rating
6-1/4
7
7-1/2
8
9
10
12
15
20
25
30
35
40
45
50
60
Based on NEC® exception permitting fuse rating to be increased, but not to exceed, 225% motor F.L.A. However per
NEC® Article 430.152, Class CC (0-30) fuses can now be sized up to 400% of motor F.L.A.
Based on Littelfuse CCMR time-delay characteristics.
Motor F.L.A.
*LRA
0.00–1.00
1.01–2.00
2.01–10.0
10.1–17.8
850%
750%
650%
600%
* If motor LRA varies from these values, contact