Tweco 300 ACDC Arcmaster - Manual (Page 25)

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3.09 Duty Cycle
The duty cycle of a welding power source is the percentage of a ten (10) minute period that it can be
operated at a given output without causing overheating and damage to the unit. If the welding amperes
decrease, the duty cycle increases. If the welding amperes are increased beyond the rated output, the
duty cycle will decrease.
WARNING
Exceeding the duty cycle ratings will cause the thermal overload protection circuit to become
energized and shut down the output until the unit has cooled to normal operating temperature.
CAUTION
Continually exceeding the duty cycle ratings can cause damage to the welding power source
and will void the manufactures warranty.
NOTE
Due to variations that can occur in manufactured products, claimed performance, voltages,
ratings, all capacities, measurements, dimensions and weights quoted are approximate only.
Achievable capacities and ratings in use and operation will depend upon correct installation,
use, applications, maintenance and service.