1. Test button: Adjustable power connection, automatic and manual reset, optional with test and stop buttons. This means the button for testing whether the thermal overload relay can function. Pressing this button simulates the normal operation of the thermal overload relay in case of overload or overcurrent. 2. Phase failure protection: Thermal overload relays feature differential phase failure protection and flexible detection mechanisms. The rated insulation voltage is 690V, with temperature compensation for performance. 3. Flameretardant material: The plastic housing of the thermal overload relay is made of quality flameretardant material, resistant to temperatures and deformation. Even when exposed to an open flame, it only chars gradually. 4. Good electrical conductivity: The thermal overload relay uses silver alloy contacts, largearea terminals, and independent terminals, enhancing conductivity and sensitivity. Screwtype connections ensure easy, quick installation and greater stability.