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Overload Or Thermal Protection Ansi 49  Class 5, 10, & 30 overload relays will trip within 5, 10, & 30 seconds respectively at 600% of motor full load amps Class 5 is usually used for motors requiring extremely fast tripping Class 10 is commonly used to protect artificially cooled motors such as submersible pump motors of low thermal capacityFigure 5 (below) shows a B Trip Curve overlaid onto the chart The three major components of the Trip Curve are 1 Thermal Trip Curve This is the trip curve for the bimetallic strip, which is designed for slower overcurrents to allow for in rush/startup, as described above 2 Magnetic Trip Curve This is the trip curve for the coil or solenoid Class 10 overload curve siemens