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 18D-N 18TB 18TBP	18DZ 11DZ-P	11D
		Three-Phase	Balanced or Delta Connected  loads, isolated from ground	18E	18EZ 11EZ-P	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 Moulding 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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