When the output is turned off, the internal relay in PBZ series is also turned off. However, the detection circuits are still connected, so the circuit is not completely open.
The impedance values for each model are approximately:
PBZ20-20: 120 kΩ
PBZ40-10: 220 kΩ
PBZ60-6.7: 320 kΩ
PBZ80-5: 420 kΩ