Specifications

99
Random Access Memory Usually refers to a type of semiconductor memory often used
(RAM) for temporary storage. RAM requires the continual application of
power to retain information. For some systems, battery backup
is used to prevent data or program loss in the event of a power
outage.
Reactance
The opposition to alternating current resulting from circuit
inductance and capacitance. The symbol for reactance is “X.”
The unit for reactance is the ohm.
Reactive Power Power associated with inductance or capacitance. The unit for
reactive power is the var.
Read Only Memory (ROM) Usually refers to a type of semiconductor memory often used for
permanent storage of data or programs that do not change.
Rectifier
A device or circuit that converts alternating current to direct
current.
Input
Full-wave
Rectifier
Output
Input
Half-wave
Rectifier
Output
Reduced-Voltage Starter A type of motor starter that applies less than the full-line
voltage to a three-phase induction motor while it is starting.
There are a variety of reduced-voltage starters. Some types
use electromechanical components and others use electronic
components. Electronic reduced voltage starters are often
referred to as solid-state reduced voltage starters or soft
starters.
3RW30 3RW40 3RW44
SIRIUS
FAI
LURE
DEVICE
STA
TE/BYP
ASSED
Resistance A property of a material or circuit that opposes current flow.
Resistance is symbolized by “R” and is measured in ohms.