Abbreviations of Control Components

http://www2.sea.siemens.com | Abbreviations of Control Components | 2007-12-21

AC	Alternating Current	MTR	Motor
ALM	Alarm	MN	Manual
AM	Ammeter	NEG	Negative
ARM	Armature	NEUT	Neutral
AU	Automatic	NC	Normally Closed
BAT	Battery	NO	Normally Open
BR	Brake Relay	OHM	Ohmmeter
CAP	Capacitor	OL	Overload
CB	Circuit Breaker	PB	Pushbutton
CKT	Circuit	PH	Phase
CONT	Control	POS	Positive
CR	Control Relay	PRI	Primary
CT	Current Transformer	PS	Pressure Switch
D	Down	R	Reverse
DC	Direct Current	REC	Rectifier
DISC	Disconnect Switch	RES	Resistor
DP	Double-Pole	RH	Rheostat
DPDT	Double-Pole, Double-Throw	S	Switch
DPST	Double-Pole, Single-Throw	SEC	Secondary
DT	Double Throw	SOL	Solenoid
F	Forward	SP	Single-Pole
FREQ	Frequency	SPDT	Single-Pole, Double Throw
FTS	Foot Switch	SPST	Single-Pole, Single Throw
FU	Fuse	SS	Selector Switch
GEN	Generator	SSW	Safety Switch
GRD	Ground	T	Transformer
HOA	Hand/Off/Auto Selector Switch	TB	Terminal Board
IC	Integrated Circuit	TD	Time Delay
INTLK	Interlock	THS	Thermostat Switch
IOL	Instantaneous Overload	TR	Time Delay Relay
JB	Junction Box	U	Up
LS	Limit Switch	UV	Under Voltage
LT	Lamp	VFD	Variable Frequency Drive
M	Motor Starter	XFR	Transformer
MSP	Motor Starter Protector