Time delay device

A hydraulic time delay device for coupling to a fault-sensing element in a circuit recloser, the time delay device comprising:

• a piston having an external connection and operable to move through a housing in the device to cause hydraulic fluid in the housing to flow out of the housing and into a passageway, wherein a time delay of the time delay device corresponds to a time required to move the piston;
• and
• three adjustment mechanisms that affect the time required to move the piston,
• wherein adjustment of each adjustment mechanism is independent of adjustment of the other adjustment mechanisms.

A retrofit module for use in a hydraulic time delay device operable on a circuit recloser, the retrofit module comprising:

• a valve;
• an adjustable screw that applies a force to the valve through a valve spring which couples the valve to the adjustable screw, the adjustable screw comprising:
• a cavity formed through an inner section of the adjustable screw;
• a first orifice formed at a section of the cavity and configured to couple the cavity to an exterior of the module;
• and
• a second orifice formed at another section of the cavity and configured to couple the cavity to an exterior of the module;
• and
• another adjustable screw positioned inside the cavity and operable to adjust a size of the second orifice.