Home / Products tagged “fail-safe relays” fail-safe relays Sort by popularity Sort by latest Sort by price: low to high Sort by price: high to low Sort by Name: Alphabetical Model 801-W2C | Vacuum Gauge with 2 relays for process control The Digivac Model 801-W2C vacuum gauge combines fail-safe relays and rugged electronics for system integration and process control. Upgrade for Varian 801 pointer meter $641.84 Add to cart