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SCR Power Controllers
For Electrical Resistance Heaters
125, 200, 250 Amp
SCR19-H and
SCR39-H Series
U Zero Crossing or
Phase-Angle Fired
U Diagnostic LED
Indicators
U Single- or 3-Phase
Load Switching
U Extends Heater Life—
Reduces Thermal Shock
U No Maintenance—All
Solid State Components
U Close Control of Low
Mass Heaters
U Phase Angle with
Soft Start for High
Inrush Heaters
U No Relay Noise—Contact
Arc Noise Eliminated
U Semiconductor
I2T Fusing
U Optically Isolated
4 to 20 mA Control
Signal Input
U Fan Cooled
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 (radio frequency interference)
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.
Dimensions: mm (inch)
Model No. Height Width Depth
SCR19-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 (14.6)
SCR39Z-H 222.25 (8.750) 287.02 (11.3) 370.84 (14.6)
SCR39P-H 222.25 (8.750) 394.46 (15.530) 370.84 (14.6)
Note: When fuses are added to unit, add 83 mm (3.3") to height.
SCR39Z-H-48-250 shown smaller than actual size.
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.
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Specifications
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
Single-Phase Load
Current (Amps) Equation
Total Amps = Total Watts (Load)
(**) Soft Start or Voltage Limit
Code Description
(*) Specify Line Voltage
Code Description
12 120 Vac
20 208 Vac
24 240 Vac
48 480 Vac
S9 Soft start 9 seconds
S15 Soft start 15 seconds
S30 Soft start 30 seconds
S60 Soft start 60 seconds
S120 Soft start 120 seconds
V Voltage limit
Phase-Angle Firing Models
To Order
Model No. Current Load (A) Weight kg (lb)
Single-Phase Models
SCR19P-H-(*)-125-(**) 125 6.1 (13.5)
SCR19P-H-(*)-200-(**) 200 6.4 (14.0)
SCR19P-H-(*)-250-(**) 250 6.4 (14.0)
3-Phase Models
SCR39P-H-(*)-125-(**) 125 16.1 (35.5)
SCR39P-H-(*)-200-(**) 200 16.8 (37.0)
SCR39P-H-(*)-250-(**) 250 16.8 (37.0)
All phase-angle models come complete with 1 fuse per SCR line controlled, and operator’s
manual.
Ordering Examples: SCR19P-H-24-125-S30, 125 A, 240V single-phase-angle model with a
30 second soft start option. OCW-3, OMEGACARESM extends standard 2-year warranty to a
total of 5 years.
SCR39P-H-48-200-S9, 200 A, 480V three-phase-angle model with a 9 second soft start option.
Volts (Line Voltage)
Three-Phase Load
Current (Amps) Equation
Total Amps = Total Watts (Load)
1.73 x Volts (Line Voltage)
SM
Extended Warranty
Program
OMEGACARESM extended warranty program
is available for models shown on this page.
Ask your sales representative for full details
when placing an order. OMEGACARE
covers parts, labor and equivalent loaners.
SM
Zero-Voltage Switching Models
Model No. Current Load (A) Weight kg (lb)
120 to 480V, Single-Phase Models
SCR19Z-H-48-125 125 6.1 (13.5)
SCR19Z-H-48-200 200 6.4 (14.0)
SCR19Z-H-48-250 250 6.4 (14.0)
120 to 480V, 3-Phase Models
SCR39Z-H-48-125 125 12.5 (27.0)
SCR39Z-H-48-200 200 12.5 (27.5)
SCR39Z-H-48-250 250 12.5 (27.5)
All zero-voltage models come complete with 1 fuse per SCR line controlled, and operator’s
manual.
Ordering Examples: SCR19Z-H-48-250, 250 A, 120-480V, single-phase zero-voltage
model.
SCR39Z-48-125, 125 A , 120-480V, three- phase, zero-voltage model.
OCW-1, OMEGACARE
SM
extends standard 2-year warranty to a total of 3 years.
Replacement Fuses for SCR19-H, SCR39-H Series (120 to 480 Vac)
Model No. Current (A)
SCR-210A044U01 125
SCR-210A046U01 200
SCR-210A045U01 250
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