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SCR Power Controllers

SCR19-H and SCR39-H

SCR Power Controllers | SCR19-H and SCR39-H

SCR Power Controllers

See All Models Below

2 year warranty OmegaCare
  • Zero Crossing or Phase-Angle Fired
  • Diagnostic LED Indicators
  • Single- or 3-Phase Load Switching
  • Extends Heater Life -- Reduces Thermal Shock
  • No Maintenance -- All Solid State Components
  • Close Control of Low Mass Heaters
  • Phase Angle with Soft Start for High Inrush Heaters
  • No Relay Noise--Contact Arc Noise Eliminated
  • Semiconductor I²T Fusing
  • Optically Isolated 4 to 20 mA Control Signal Input
  • Fan Cooled
Controllers, Meters and Switching Devices - View related products


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.
Place Order(Specify Model Number)
Part Number/Desc.
Single-Phase Models
Availability: 5 weeks  
120 to 480V, Single-Phase, Zero Voltage Switching, 125A Model
Availability: 5 weeks  
120 to 480V, Single-Phase, Zero Voltage Switching, 200A Model
Availability: 5 weeks  
120 to 480V, Single-Phase, Zero Voltage Switching, 250A Model
3-Phase Models
Availability: 5 weeks  
120 to 480V, 3-Phase, Zero Voltage Switching, 125A Model
Availability: 5 weeks  
120 to 480V, 3-Phase, Zero Voltage Switching, 200A Model
Availability: 5 weeks  
120 to 480V, 3-Phase, Zero Voltage Switching, 250A Model
All dollar amounts on this site are shown in Canadian currency. Note: All phase-angle models come complete with 1 fuse per SCR line controlled, and operator’s manual. All zero-voltage models come complete with 1 fuse per SCR line controlled, and operator’s manual.

Part Number Builder

Build Your Part Number Below
Option Descriptions:

(1) Phase select from:
1 for Single Phase
3 for 3 Phase

(2) Method select from:
P for Phase-Angle Firing Models
Z for Zero-Voltage Switching Models

(3) Line Voltage select from:
12 for 120 Vac (Single Phase Only)
20 for 208 Vac (Single Phase Only)
24 for 240 Vac (Single Phase Only)
48 for 480 Vac

(4) Amp Ratings select from:
125 for 125 Amps
200 for 200 Amps
250 for 250 Amps

(5) Soft Start or Voltage Limit select from:
Nothing(leave field blank) for Zero-Voltage Switching Models
-S9 for Soft start 9 seconds
-S15 for Soft start 15 seconds
-S30 for Soft start 30 seconds
-S60 for Soft start 60 seconds
-S120 for Soft start 120 seconds
-V for Voltage limit
-X for No soft start or voltage limit
Note: All combinations may not be valid, check spec sheet for valid part numbers.