term1 Definition1term2 Definition2term3 Definition3
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1
Master Elements
is the initiating device, such as a control switch, voltage relay, float switch, etc., which serves either directly or through such permissive devices as protective and time-delay relays to place an equipment in or out of operation.
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Reserved for Future application
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Over-speed Device
is usually a direct-connected speed switch which functions on machine over-speed.
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is a relay that functions when the circuit admittance, impedance, or reactance increases or decreases beyond predetermined limits.
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Reserved for future Application
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Undervolatge Relay
is a relay that functions on a given value of under-voltage.
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Annunciator Relay
is a non-automatically reset device that gives a number of separate visual indications of the functions of protective devices, and which may also be arranged to perform a lockout function.
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Directional Power Relay
is a device that functions on a desired value of power flow in a given direction or upon reverse power resulting from arcback in the anode or cathode circuits of a power rectifier.
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Undercurrent or Underpower Relay
is a relay that function when the current or power flow decreases below a predetermined value.
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Field Relay
is a relay that functions on a given or abnormally low value or failure of a machine field current, or on excessive value of the reactive component of armature current in an a-c machine indicating abnormally low field excitation.
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