Abbreviations of Control Components

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



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