SCR Power Controllers

SCR19-H and SCR39-H

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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

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Descrição

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)

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

Note: To Order Phase-Firing Models, see Part Number Builder section below.