INSTALLATION, OPERATIONS AND MAINTENANCE MANUAL 47
Electronic overload table for fusible controllers
Tripping current is 120% of Dial setting. Motors
with 1.15-1.25 service factor, set dial to motor
FLA Motors with 1.0 service factor, set dial to 0.9
motor FLA.
Heaters for NEMA size 6 and 7 fused controllers
For continuous-rated motors with a service factor
of 1.15 to 1.25, select the appropriate heaters for
the motor full-load current. For continuous-rated
motors with a service factor of 1.0, multiply the
motor full-load current by 0.9 and use this value
to select heaters.
the minimum value of full-load current multiplied
by 1.25. Provide short-circuit protection in
accordance with the National Electrical Code
Overload heaters for controllers with NEMA
Size 6 starters for standard and ambient-
Overload heaters for controllers with NEMA
Size 7 starters for standard and ambient-
Motor Full-Load
Heater Number
Maximum Fuse
Rating
600
Maximum Motor
Full-Load Current
Current Transformer
Secondary Amps
Heater Number
Maximum Motor
Full-Load Current
Current Transformer
Secondary Amps
Heater
Number
NEMA
Size
FLA Range
in Amps
Catalog
Number Max. Fuse in Amps
Additional motor overload protection required for
MM200 abd MM300 relay applications with FLA less
than 6A.
Opening of the circuit breaker or power
fuse may be an indication that a fault
current has been interrupted. To provide
continued protection against fire or shock
hazard, examine all current-carrying parts
and other components of the motor
controller and replace any damaged
components. If heater burnout occurs, the
complete overload relay must be replaced.
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