Moeller - Marking of electrical equipment for North America - Device or Function Code Letters to NEMA ICS 19-2002

Device or Function Code Letters to NEMA ICS 19-2002 [t-head1-pg]


Code letter		Device or Function
A		Accelerating
AM		Ammeter
B		Braking
C or CAP		Capacitor, capacitance
CB		Circuit-breaker
CR		Control relay
CT		Current transformer
DM		Demand meter
D		Diode
DS or DISC		Disconnect switch
DB		Dynamic braking
FA		Field accelerating
FC		Field contactor
FD		Field decelerating
FL		Field-loss
F or FWD		Forward
FM		Frequency meter
FU		Fuse
GP		Ground protective
H		Hoist
J		Jog
LS		Limit switch
L		Lower
M		Main contactor
MCR		Master control relay
MS		Master switch
OC		Overcurrent
OL		Overload
P		Plugging, potentiometer
PFM		Power factor meter
PB		Pushbutton
PS		Pressure switch
REC		Rectifier
R or RES		Resistor, resistance
REV		Reverse
RH		Rheostat
SS		Selector switch
SCR		Silicon controlled rectifier
SV		Solenoid valve
SC		Squirrel cage
S		Starting contactor
SU		Suppressor
TACH		Tachometer generator
TB		Terminal block, board
TR		Time-delay relay
Q		Transistor
UV		Undervoltage
VM		Voltmeter
WHM		Watthour meter
WM		Wattmeter
X		Reactor, reactance

As an alternative to device designation with code letter to NEMA ICS 19-2002 the designation to class designation is permissible. Class designation marking should simplify harmonization with international standards. The code letters used here are, in part, similar to those of IEC 61346-1 (1996-03).