Versions: ST3P- 1) A: standard type (on-delay, multi range) 2) C: with inst. contacts (on-delay, multi range) 3) F: off-delay 4) K: contact signal off-delay 5) Y: timing for stat-delta motor starters (on delay) 6) R: on-off repetitive type (on-delay) 7) P: plug-in type