STA 4kW High Voltage Power Supplies (Featured Image)

STA Series

  • Single 3U (5.25”) Chassis
  • Models from 1kV to 70kV
  • Remote Analog and Remote Ethernet Interface
  • User Configurable Settings Via Ethernet Interface

*Note: All specifications are subject to change without notice. Please consult the English PDF version of this datasheet for the most up-to-date revision.

Two Year Extended Warranty & RoHS Compliant Logos CE Marking

4kW High Voltage Power Supplies

Spellman’s STA Series of 4kW high voltage power supplies are available in positive or negative polarities in 15 different models with outputs ranging from 1kV to 70kV. A full featured front panel allows easy local control, while an extensive analog interface provides comprehen­sive remote capability. The standard Ethernet and RS-232 digital interfaces simplify integrating the STA into your system design.

The STA’s robust IGBT inverter is inherently fault tolerant and is ideal for demanding applications like semiconductor processing and vacuum deposition. Many operational fea­tures can be configured by the user to suit their particular requirements.

Typical applications:

  • Ion Beam Implantation
  • Semiconductor Processing
  • Electron Beam Welding
  • Capacitor Charging
  • High Power RF Transmitters
  • Electrostatic Precipitators
  • X-Ray Systems


(Rev. 128104-001 REV. J)


BFP - Blank Front Panel  
HS - High Stability  
LL(X) - High Voltage Cable Length  
1PH - 180-264Vac, Single Phase Input


Adjustable Overload Trip

Arc Trip Count

Arc Quench Time

Arc Re-Ramp Time

Constant Power Control

Adjustable Power Trip

Slow Start Ramp Times


Input Voltage:

Standard: 180-264Vac, 50/60Hz, three phase, 90% efficiency, 0.85 power factor 

Optional: 180-264Vac 50/60Hz, single phase (1PH)

Input Current:

Standard: 180-264Vac, three phase 17 amps, maximum

Optional: 180-264Vac, single phase 38 amps, maximum

Output Voltage:

15 models from 1kV to 70kV. Each model is available 
with positive or negative outputs.

Local Output Controls:

Voltage and current are continuously adjustable over entire range via ten-turn potentiometers with lockable counting dials.

Voltage Regulation:

Load: 0.05% of full voltage +500mV for full load change.

Line: 0.05%of full voltage +500mV over specified input range.

Current Regulation:

Load: 0.05% of full current ±100µA for any voltage change.

Line: 0.05% of full current over specified input range.


0.1% p-p +1Vrms


0.02%hr. after 1 hour warm-up.

Temperature Coefficient:

100ppm/°C. Higher stability (50ppm/°C) available on special order via the HS option


Temperature Range:

Operating: 0°C to 40°C 
Storage: -40°C to 85°C


10% to 90% RH, non-condensing.


Forced air; inlet through side panels, outlet at rear panel


Digital voltage and current meters, accurate to within 1%

System Status Display: 

“Dead Front” type indicators provide status of up to 12 system operations including voltage and current regulation, fault conditions and circuit control.

Analog Interface Connector:

50 pin female D connector

High Voltage Output Cable: 

A detachable 10’ (3.05m) long shielded HV cable is provided


1kV to 70kV: 5.25. (3U)H X 19. W X 21. D (133mm x 482mm x 533mm)


1kV to 8kV: 46 lbs. (20.87kg)

10kV to 70kV: 58 lbs. (26.31kg)

Individual kV models may vary

Regulatory Approvals:

Compliant to EEC EMC Directive. Compliant to EEC Low Voltage Directive. RoHS Compliant.

Digital Interface

The STA features a standard RS-232 and Ethernet digital interface. Utilizing these standard digital interfaces can dramatically simplify power supply interfacing require­ments saving the user both time and money, while enhan­cing functionality and overall capability. Spellman provides a GUI with the STA that allows the customer to both cus­tomize operational features of the STA while also providing basic power supply operational features. Details of the STA’s digital interface capability are described in the STA manual, downloadable via the link on the first page of this data sheet.

Arc Intervention

Spellman’s STA power supplies have an arc intervention feature that senses arc currents via a fast acting current sense transformer. The purpose of the arc intervention circuitry is to prevent power supply damage from contin­uous, long term arcing. The factory default configuration will trip off the unit with an Arc Fault if 4 arcs occur in a 10 second time period. Customers can change basic arc intervention parameters (Arc Count, Arc Quench, Reramp Time, and Window Time) within preset limits via the digital interface; customized units can be provided for unique arc prone environments, contact Spellman for details.

STA High Voltage Power Supply (Image 1)

STA rear panel shown with local operation plug installed in 50 pin D connector

Electronic Component (Power Source)

STA series is intended for installation as a component of a system. It is designed to meet CE standards, with conditions of acceptance often being: customer provided enclosure mounting, EMC filtering, and appropriate protection, and isolation devices. The STA series is not intended to be operated by end users as a stand-alone device. The STA series power supply can only be fully assessed when installed within a system, and as a component part within that system.


Maximum Rating Model Number
kV mA
1 4,000 STA1*4
2 2,000 STA2*4
1,333 STA3*4
4 1,000 STA4*4
667 STA6*4
8 500 STA8*4
10 400 STA10*4
12 333 STA12*4
15 267 STA15*4
200 STA20*4
133 STA30*4
40 100 STA40*4
80 STA50*4
67 STA60*4
70 57 STA70*4

*Substitute “P” for positive polarity and “N” for negative polarity. Polarity must be specified at time of order.


Pin Signal Parameters
1 Power Supply Common Power Supply Ground
2 Reset/HV Inhibit Normally open, Low = Reset/Inhibit
3 External Interlock
+24Vdc @ open, <25mA @ closed
4 External Interlock Return
Return for External Interlock
5 mA Test Point
0-10Vdc = 0-100% rated output, Zout= 1KΩ, 1%
6 kV Test Point
0-10Vdc = 0-100% rated output, Zout= 1KΩ, 1%
7 +10Vdc Reference Output
+10Vdc @ 1mA
8 mA Program Input
0-10Vdc = 0-100% rated output, Zin>10MΩ
9 Local mA Program Output
0-10Vdc = 0-100% rated output, front panel pot
10 kV Program Input
0-10Vdc = 0-100% rated output, Zin>10MΩ
11 Local kV Program Output
0-10Vdc = 0-100% rated output, front panel pot
12 Remote Power On Output
+24Vdc @ open, 2A peak, 1Adc @ closed
13 Remote Power On Return
Return for Remote Power On
14 Remote HV Off +24Vdc @ open, 2A peak, 1Adc @ closed, connect to
pin15 for front panel operation
15 Remote HV Off/On Common
HV On/Off Common
16 Remote HV On +24Vdc @ open, 2A peak, 1Adc @ closed, momentarily
connect to pin 15 enable high voltage
17 HV Off Indicator +24Vdc @ 25mA = HV Off
18 HV On Indicator
+24Vdc @ 25mA = HV On
19 Power Supply Common
Supply Ground
20 +24Vdc Output
+24Vdc @ 100mA, maximum
21 Voltage Mode Status Open Collector, Low = Active
22 Current Mode Status
Open Collector, Low = Active
23 Power Mode Status
Open Collector, Low = Active
24 Interlock Closed Status
Open Collector, Low = Active
25 Power Test Point
0-10Vdc = 0-100% rated output, Zout= 5KΩ, 1%
26 Spare  
27 Spare  
28 Remote Overvoltage Adjust
0-10Vdc = 0-100% rated output
29 Over Power Fault
Open Collector, Low = Active
30 Over Voltage Fault
Open Collector, Low = Active
31 Over Current Fault
Open Collector, Low = Active
32 System Fault
Open Collector, Low = Active
33 RGLT Error Fault
Open Collector, Low = Active
34 Arc
Open Collector, Low = Active
35 Over Temp Fault
Open Collector, Low = Active
36 AC Fault
Open Collector, Low = Active
37 Spare  
38 Spare  
39 Spare  
40 Spare  
41 Spare  
42 Remote Power Program Input
0-10Vdc = 0-100% rated output, Zin>10MΩ
43 Local Power Program Output
0-10Vdc = 0-100% rated output, internal pot
44 +5Vdc Output
+5Vdc @ 100mA, maximum
45 +15Vdc Output
+15Vdc @ 100mA, maximum
46 -15Vdc Output
-15Vdc @ 10mA, maximum
47 RS232 Tx  
48 RS232 Rx  
49 RS232 GND  
50 Power Supply Common
Power Supply Ground

Tables & Diagrams