The cycling thermostat must also be replaced when replacing the thermal fuse. The cycling thermostat's failure to cycle off the heating element results in overheating of the dryer which consequently blows the thermal fuse open.
Replacing only the thermal fuse should the dryer stops running and
fails to start will result in its premature blowing or even the thermal
cut-out (cut-off) located on the heater duct. Like the cycling thermostat, the high-limit thermostat must also be replaced once the thermal cut-out blows open. Refer to the parts diagram in the link below and look for item numbers 31(thermal cut-off), 34(hi-limit thermostat), 39(thermal fuse), and 41(cycling thermostat.
Kenmore Series 70 Electric Dryer (110.74722400) Bulkhead Parts
Thermal fuse 3399849 trips if the exhaust air leaving the dryer becomes too hot. 
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