spnoSPNO SIL (5 x 19 x 8) APPROVALS : VDE, UL. Fully sealed construction Electrical Life: 5 x 10 6 operations Contact Material Rh Switching voltage 200Vac Vibration resistance 10 - 2000Hz,Hartland Controls Littelfuse HCR-5 SPNO and SPDT General Purpose Switching Relays are used in applications such as HVAC systems, standby power supplies, and telephone