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SCR Power Controllers or Electrical Resistance Heaters 250A Max

SCR Power Controllers


Item# SCR39Z-H-48-250

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-9 $2,769.69
10-24 $2,631.21
25-49 $2,575.81
50-99 $2,465.02
100-199 $2,409.63
200+ $2,354.24

In stock

Lead Time (If not in stock): 9 weeks
SCR Power Controllers SCR39Z-H-48-250 SCR39Z-H-48-250
  • Zero Crossing or Phase-Angle Fired
  • Diagnostic LED Indicators
  • Single- or 3-Phase Load Switching
  • Extends Heater Life -- Reduces Thermal Shock

SCR39Z-H-48-250 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

AC Line Voltage
Nominal Load Current
Control Signal Type

The SCR19-H and SCR39-H Series power controllers are designed to proportion electric power to resistive loads only, such as ovens, furnaces, heat sealers, etc. The controllers consist of power semi-conductors (SCRs), properly sized heat sinks, trigger circuitry, and fuses supplied on panels for surface mounting. (Note: They are not designed to drive transformers or any inductive load.) The power controller accepts a 4 to 20 mAdc output from a temperature controller.

Zero Voltage Switched Models
The SCR19Z-H and SCR39Z-H SCR power controllers are zero crossover fired, high-power solid state switched devices. Zero crossover firing eliminates the RFI generation associated with mechanical relays. With zero crossover firing, the output appears as bursts of full sine waves of line voltage which provides excellent regulation to the load.

Phase Angle Fired Models
The SCR19P-H and SCR39P-H SCR phase-angle fired power controllers turn on each SCR for a controlled portion of a half-cycle of the line voltage. The effective line voltage is determined by the portion of the line voltage delivered, which is proportional to the input control signal. Additionally, the voltage is regulated as the line voltage changes.

Dimensions mm (inches): Note: When fuses are added to unit, add 83 mm (3.3") to height.
Model No. Height Width Depth
SCR19Z-H 222.25 (8.750) 135.12 (5.320) 370.84 (14.6)
SCR19P-H 222.25 (8.750) 135.12 (5.320) 370.84 (14.60)
SCR39Z-H 222.25 (8.750) 287.02 (11.30) 370.84 (14.60)
SCR39P-H 222.25 (8.750) 394.46 (15.530) 370.84 (14.6)

Supply Voltage: 120 to 600 Vac
Frequency: 50 to 60 Hz
Current Rating: 125 to 250 A Input Control Signal Isolation: 2500 Vac
Transient Voltage Protection: Inherent built-in immunity
Ambient Temperature: 0 to 50°C (32 to 122°F)
Load: Resistive
SCR39Z-H: 1-phase, 2-leg control for 3-wire delta, 3-phase ungrounded wye
SCR19Z-H: 1-phase, 1-leg control
SCR39P-H: 3-phase, 3-leg half control for 3-wire delta or 3-phase ungrounded wye
SCR19P-H: 1-phase, 1-leg control
Diagnostic Indicators: Shorted or open SCR
Cooling: Fan cooled, requires 120 Vac control voltage

Note: To Order Phase-Firing Models, see Part Number Builder section below.
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Are these SCR controllers UL508A recognized or listed?

Asked by: Steven D
Thank you for your request. This product are not CSA, UL and/or cUL listed/rated.
Answered by: Application Engineer CB
Date published: 2024-06-07

Can multiple electric heaters be powered through a single SCR Controller. I have an application where ideally 3 to 6 heaters would be controlled by a single SCR controller. Each heater is 750 watts and voltage is 208/1/60V ?

Asked by: Maxwell
Hi Maxwell, You can connect multiple heaters to a single SCR controller. The heaters are wired in parallel then wired in a series circuit with the SCR and your power source. The maximum number of heaters would depend on the maximum current rating of the SCR. In your example (6) heaters x 750 watts each = 4500 total watts Current = 4500 / 208 = 21.63 amps The SCR needed would have a max current rating of 22 amps or greater for this application Best regards, Omega
Answered by: RD Engineer
Date published: 2021-08-30

Looking for a power source to connect to the coils of a 3-phase motor. I do not want to run the motor, rather, to run current through the windings and heat them up, drying out wet windings. Coils are inductive loads; will it work to heat them up?

Asked by: JDT1977
Hi JDT1977 Please forward this question to TEMP@OMEGA.COM. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2022-08-12
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