Thermal Magnetic Best used for traditional applications where temperatures do not fluctuate far from the reference ambient temperatures for circuit breakers, 25°C to 40°C (77°F to 104°F).The face of each breaker is marked with a 'T' indicating Thermal. Hydraulic Magnetic Best for harsh environments where temperature extremes are common. Precision trip technology helps ensure breakers operate as intended from -40°C to 85°C (-40°F to 185°F) without re-rating. Smart Features Hydraulic Magnetic technology and remote monitoring capabilities using the My Leviton app*. The face of each breaker is marked with the connectivity symbol indicating Smart functionality. EL E C TR I C AL I NDU S T RY CANADA VOLUME 1, ISSUE 5 6https://www.leviton.com/en/products/residential/load-centers/circuit-breakers/branch#t=Products&sort=%40partnumber%20ascending&layout=card&f:@tsa_smart_enabled=[Yes]