Electromagnetically-operated devices
Mechanical testing
Electrical resistance
Electronic equipment and components
Relays
Operating time
Contactors
Defects
Contactor relays
Mercury switches
Thermal properties of materials
Magnetomechanical effects
Time
Circuit properties
Electrical testing
Electrical components
Contact resistance
Electric coils
Resistance measurement
Switches
Switchgear
Testing conditions
Time measurement
Electric load cycling tests
Environmental testing
Test equipment