Square D A3.95 Thermal Unit, Class 20, Standard Trip

Thermal units are intended to protect motors, controllers and branch circuit conductors against excessive heating due to prolonged motor over currents up to and including locked rotor currents. Protection of the motor and the other branch circuit components from higher currents, due to short circuit or grounds, is a function of the branch circuit fuses or circuit breakers. Class 20 thermal units respond to overload current conditions according to trip curves. These thermal units will trip in 20 s or less on overload conditions. These thermal units have a one-piece construction. The motor current passes through a small heater winding within these thermal units. Under overload conditions, the heat causes a special solder to melt allowing a ratchet wheel to spin-free thus opening the control circuit contacts and opening the motor contacts.
Square D Thermal Unit, Series: A Series, Class 20, Standard Trip

• Catalog https://assets.unilogcorp.com/267/ITEM/DOC/Square_D_A3_95_Catalog.pdf
• RoHS https://assets.unilogcorp.com/267/ITEM/DOC/Square_D_A3_95_RoHS.pdf
• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/Square_D_A3_95_Specification_Sheet.pdf