Solid-State Switching Devices for Resistive Loads Solid-State Relays 3RF22 solid-state relays, three-phase, 45 mm ■ Characteristic curves Dependence of the device current I e on the ambient temperature T a and the heat sink resistance R thha (two-phase controlled) 100 Module power loss in W NSB0_01671 e in A M 80 Rthha 60 0,35 K/W 0,45 K/W 0,56 K/W 40 0,75 K/W 1 K/W 1,7 K/W 1,3 K/W 20 2,2 K/W 3 K/W 4 K/W 5 K/W 10 K/W 7 K/W 4 12 20 30 36 60 Ambient temperature in °C Device current in A a e 28 0 10 20 30 40 50 Type current 30 A (3RF22 30-.AB..) Module power loss in W 160 e in A M 140 120 Rthha 100 0,13 K/W 0,18 K/W 0,25 K/W 80 0,37 K/W 0,55 K/W 60 1,2 K/W 0,8 K/W 40 2 K/W 3 K/W 20 NSB0_01672 4 K/W 5 K/W 10 K/W 0 7 K/W 5 15 25 35 45 55 Ambient temperature in °C Device current in A 60 0 10 20 30 40 50 Type current 55 A (3RF22 55-.AB..) a e 22 Siemens · 2009