No. SS2-APN100-0100 - 5 - * Power down monitor contact display (Model No.) Normally closed (H) . Contact closed during power supply (Open during power failure) Normally open (K) . Contact open during power supply (Closed during power failure) * Limit switch, pneumatic pressure down monitor, M1, M2 contact display (Normally closed contacts are shown.) Figure 2. Contact Open and Closed 9 7