Installation
Fuse Circuit Breaker Ratings for All MSC-3 Models
Model Numbers Chassis Size Maximum RMS
Input Current
Recommended Fuse
or C/B Rating (A)
UL Class Fuse for UL
compliant installation (A)†
MSC-3*3 A 4.1 10 10A, Class J
MSC-3*5 A 6.9 10 10A, Class J
MSC-3*7 A 9.6 16 15A, Class J
MSC-3*11 A 15.1 20 120A, Class J
MSC-3*15 B 22.5 32 30A, Class T
MSC-3*23 B 33.0 40 40A, Class T
MSC-3*30 B 43.1 63 60A, Class T
MSC-3*40 B 55.0 63 60A, Class T
MSC-3*55 C 78.0 100 100A, Class T
MSC-3*82 C 108.0 125 125A, Class T
MSC-3*109 C 148.0 160 175A, Class T
MSC-3*140 C 179.0 200 200A, Class T
MSC-3*170 C 187.0 200 200A, Class T
MSC-3R220 D 231.0 259 250A, Class T
MSC-3R260 D 270.0 320 320A, Class T
MSC-3R315 D 336.0 400 400A, Class T
MSC-3R360 D 370.0 400 400A, Class T
MSC-3R390 D 397.0 630 630A, Class T
MSC-3R430 D 434.0 630 630A, Class T
MSC-3R490 D 516.0 630 630A, Class T
* 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.
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