• Manual Reset
  • Burner Circuit Test Button
  • LED Indicating Lights
  • Meets ASME CSD-1 Requirements for
  • Commercial Water Boilers
  • Can be used as a secondary low water cut-off for steam boilers
Specifications Model 500 Model 550
Power Consumption 2 VA 4 VA
Switching Capacity 50 VA 5.8 FLA, 34.8 LRA
Switch Contacts SPDT SPDT
Max. Pressure 160 PSI 160 PSI
500 24 VAC Interrupts power immediately in a low water condition. Burner circuit locks-out if water remains below probe for 30 seconds. Manual reset will not trip due to power failures. Test button checks burner circuit to ensure proper control operation and lock-out function without lowering the water level. Note: Can also be used as a secondary cut-off on steam boilers.
 550  120 VAC