Starter Acc - Heater Element; Thermal Overload|Heater Element; 0.78 A; Size 1; NEMA 1

OVERVIEW

United States Industry Standards (NEMA Part ICS 2-222) designate an overload relay by a class number indicating the maximum time in seconds at which it will trip when carrying a current equal to 600 percent of its current rating. A Class 10 overload relay will trip in 10 seconds or less at a current equal to 600 percent of its rating.A Class 20 overload relay will trip in 20 seconds or less at a current equal to 600 percent of its rating. A Class 30 overload relay will trip in 30 seconds or less at a current equal to 600 percent of its rating. Allen-Bradley standard overload relay protection is provided using Type W heater elements for the 500 Line. This provides Class 20 operation and is recommended for General Applications. Specific Applications may require Class 10 or Class 30 overload relays. Class 10 overload relays are often used with hermetic motors, submersible pumps, or motors with short locked rotor time capability. Class 30 overload relays should be used with motors driving high inertia loads, where additional accelerating time is needed and the safe permissible locked rotor time of the motor is within Class 30 performance requirements