Dictionary of Abbreviations
AC Alternating Current
ACR Auxiliary Control Relay
AHF Adjustable Holding Force
ALT ACT Alternate Action
ATB Armature Thru Bolt
ATD Adjustable Time Delay
ATMS Armature Template Machine Screw
AWG American Wire Gauge
BG Break Glass
BP Bolt Position Pin
BES Bolt Extended Switch
BPS Bolt Position Switch
BRS Bolt Retracted Switch
CT Center Tap
DA Delayed Action
DC Direct Current
DT Double Throw
DPS Door Position Switch
ER Emergency Release
HM Hollow Metal Door
LC Line Cord
LF Extra Long Housing – Horizontal Mount
LW Left Hand
LV Extra Long Housing – Vertical Mount
LHR Left Hand Reverse
M Magnet
MR Manual Release
MBS Magnetic Bond Sensor
MSC Manual Station Control
NC Normally Closed
NO Normally Open
PB Push Button
PS Power Sensor
PCU Power Control Unit
RB Rectifier Block
RH Right Hand
RR Residual Release Module
RHR Right Hand Reverse
SP Switch Plate
ST Single Throw
SCR Separate Control Relay
SPDT Single Pole Double Throw
SPNC Single Pole (Single Throw) Normally Closed
SPNO Single Pole (Single Throw) Normally Open
SPST Single Pole Single Throw, Maintained
TJ Top Jamb
UPS Uninterruptible Power System
VT Voltage Trimmer
WD Wood Door