I have made a rough calculation based on a TI's description. According to TI, however, this only works if the curve is the same as in the data sheet. I have assumed a maximum current of 1.5A. Is the value for C_CLAMP correct or am I doing something wrong here?
According to this, P6KE47CA would fit better as V_RWM is too close to the operating voltage V_Max.
https://www.ti.com/lit/an/slvae37/slvae37.pdfV_Max = 24VAC * sqrt(2) * 110% = 37,37 V
P6KE43CAV_RWM = 36,8V
V_R = 40,9 V_min / 45,2 V_max
Ipp = 10,3A -> 10,3 * 80% @ 85 °C = 8,24A
V_CLAMP = 59,3 V
R_DYN = (V_CLAMP - V_BR) / I_Surge = (59,3V - 45,2V)/10,3A = 1,37 Ohm
V_CLAMP = V_BR + I_Surge * R_DYN = 45,2V + 1,5 A * 1,37 Ohm = 47,26 V
P6KE47CAV_RWM = 40,2V
V_R = 44,7 V_min / 49,40 V_max
Ipp = 9,4A -> 9,4 * 80% @ 85 °C = 7,52A
V_CLAMP = 64,8 V
R_DYN = (V_CLAMP - V_BR) / I_Surge = (64,8V - 49,4V)/9,4A = 1,64 Ohm
V_CLAMP = V_BR + I_Surge * R_DYN = 49,4V + 1,5 A * 1,64 Ohm = 51,86 V