Power Control Application Guide

……………………………………………………………………..

Load Type  

Load
Characteristics

Line Power Configuration

Load
Configuration

Phase- Angle Control

Zero- Fire Control

On/Off
Control

Constant Resistance Elements:

-NICHROME
-KANTHAL
-CALROD

Resistance Nominally
Constant

<50% change versus temperature.

Single-Phase

Line-to-line or Line-to-neutral

18D 18TB 18TBP

18DZ  

11D

Three-Phase

Balanced or Delta Connected 
loads, isolated from ground 

18E

 

18EZ

11E

Grounded and/or Unbalanced loads

18E-SW

NA

NA

Variable Resistance Elements:

Quartz tubes,
T-3 Lamps,
some infrared 

  
  
panels

High hot:cold resistance ratio

causes high inrush currents when elements are cold.

Single-Phase

Line-to-line or Line-to-neutral

18D-H

NA

NA

Three-Phase

Balanced or Delta Connected 
loads, isolated from ground

18E-H

NA

NA

Balanced or Delta Connected 
loads, isolated from ground
 

18E-SW

NA

NA

Silicon-Carbide Elements:
"GLO-BAR"
(direct coupled)

Resistance
increases as
elements age.

Single-Phase

Line-to-line or Line-to-neutral

18D-H

NA

NA

Three-Phase

Balanced or Delta Connected 
loads, isolated from ground

18E-H

NA

NA

Balanced or Delta Connected
 loads, isolated from ground

18E-SW

NA

NA

Transformer-Coupled Loads:

(heating elements driven from the secondary winding of a transformer)

Inductive Load
with initial current inrush.

Single-Phase

Line-to-line or Line-to-neutral

18D-SW

NA

NA

Three-Phase

Balanced
three-phase transformers

18E-SW

NA

NA

Scott-T connected/
unbalanced transformers

18E-SW

NA

NA

Inductive or Resistive DC Loads:
magnets, fields, electrolytic cells

Resistive:
load resistance nominally constant. Inductive and
DC fields

Single-Phase

DC Power required

36D

NA

36D

Three-Phase

DC Power required

36E

NA

36E

 

Application

Type of control

Load Configuration

Product

Replace Mercury relays
Replace SSRs
Extruders
Molding machines

On/Off Control of
Constant resistance
Electric Heating Elements

Single-Phase
Constant Resistance Load

Model 11DZ

Three-Phase
Constant Resistance Load

Model 11EZ

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