Overload Heaters for Overload Relays

OVERLOAD HEATERS FOR OVERLOAD RELAYS

Properly sized overload heaters provide motor protection for the dryer. Improper heater size may allow the motor to be damaged, or could cause nuisance tripping.

Heater sizes are listed on the overload heater table on page 27. To use the table, refer to the motor rating plate and locate the full load amps (FLA),theservicefactor(SF),andtheambienttemperature(Amb.).

Example

MotorRatingPlateshowFLA=3.8,SF=1.15,and60Deg.CAmb.

From the table, heater size is H-25. Order TU267900—H25.

CAUTION

Overloadrelaysdonotprovideprotectionfromshortcircuits. Short circuit protection is provided by a device such as a breaker or wall disconnect.

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