Fuse Circuit Breaker Ratings For All Msc-3 Models; Motor Thermal Protection - Zener MSC-3 Instruction Manual

Installation

Fuse Circuit Breaker Ratings for All MSC-3 Models

Model Numbers Chassis Size
MSC-3*3
MSC-3*5
MSC-3*7
MSC-3*11
MSC-3*15
MSC-3*23
MSC-3*30
MSC-3*40
MSC-3*55
MSC-3*82
MSC-3*109
MSC-3*140
MSC-3*170
MSC-3R220
MSC-3R260
MSC-3R315
MSC-3R360
MSC-3R390
MSC-3R430
MSC-3R490
* L, R or J for Chassis A and B, L or R for Chassis C to specify supply voltage - see page 133 for
details.
† The fuse class referred to here is the American designation fuse required for a UL compliant
installation. this should not be confused with the British Type T etc designation, which refers to an
entirely different kind of fuse.

Motor thermal protection

The MSC-3 provides an electronic type thermal overload function that relies on the measured motor
current to estimate the thermal conditions of the motor. For complete motor thermal protection,
microtherms or thermistors should be installed in the motor winding and wired to the appropriate trip
relay. MSC-3 Extended Features Option provides a thermistor relay function and other features.
10
Maximum RMS
Input Current
A 4.1
A 6.9
A 9.6
A 15.1
B 22.5
B 33.0
B 43.1
B 55.0
C 78.0
C 108.0
C 148.0
C 179.0
C 187.0
D 231.0
D 270.0
D 336.0
D 370.0
D 397.0
D 434.0
D 516.0
IM00120 IM00120
Recommended Fuse
or C/B Rating (A) compliant installation (A)†
10
10
16
20
32
40
63
63
100
125
160
200
200
259
320
400
400
630
630
630
UL Class Fuse for UL
10A, Class J
10A, Class J
15A, Class J
120A, Class J
30A, Class T
40A, Class T
60A, Class T
60A, Class T
100A, Class T
125A, Class T
175A, Class T
200A, Class T
200A, Class T
250A, Class T
320A, Class T
400A, Class T
400A, Class T
630A, Class T
630A, Class T
630A, Class T