SpellmanHV ST 12kW High Voltage Power Supplies (Featured Image)

ST Series

  • Single 6U (10.5”) Chassis
  • Models from 1kV to 225kV
  • Remote Analog and Remote Ethernet Interface
  • Parallel Units for >100kW’s
  • 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

12kW High Voltage Power Supplies

Spellman’s ST Series of 12kW high voltage power supplies are available in positive or negative polarities in 20 different models with outputs ranging from 1kV to 225kV. 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 ST into your system design. 

The ST’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. Power >100kW’s can be provided by con­figuring additional chassis in parallel. 

Typical applications:

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



(Ref. 128077-001 REV. V)


Input Voltage:

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

Optional:  360-528Vac 50/60Hz, three phase (400Vac)

Input Current:

Standard:  180-264Vac, three phase; 50 amps, maximum

Optional:  360-528Vac, three phase; 25 amps, maximum

Output Voltage:

20 models from 1kV to 225kV. Each model is available with positive or negative outputs. 1kV to 10kV units are internally reversible.

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.


0.3% p-p +1Vrms. Lower ripple available via special order


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

Humidity: 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.

Digital Interface:

Ethernet and RS-232 digital interface implemented with 12 bits of resolution. A VB GUI is provided.

Input Line Connector:

A 6 foot (1.8 meter) long captive line cord is provided.

Analog Interface Connector:

50 pin female D connector

High Voltage Output Cable:

1-150kV: A detachable 10’ (3.05m) long shielded HV cable is provided

225kV: R-28 type X-Ray connector. No output cable is provided


10.5˝ (6U)H X 19˝ W X 21˝ D (266mm x 482mm x 533mm)

150kV: 10.5˝ (6U)H X 19˝ W X 23˝ D (266mm x 482mm x 584mm)

225kV: 20.55˝ H X 17.01˝ W X 29.7˝ D (521mm x 432mm x 754mm)


1kV to 50kV: <100 pounds (45.36kg)

60kV to 120kV: <140 pounds (63.50kg)

150kV: <150 pounds (68.03kg)

225kV: <260 pounds (117.9kg)

Individual kV models may vary 

Regulatory Approvals:

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

Digital Interface 

The ST 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 ST that allows the customer to both customize operational features of the ST while also pro­viding basic power supply operational features. Details of the ST’s digital interface capability are described in detail in the ST manual, downloadable via the link on the first page of this data sheet.

Main control screen

ST High Voltage Power Supply (Image 3)

Status screen

ST High Voltage Power Supply (Image 4)

User configuration screen

ST High Voltage Power Supply (Image 5)

Parallel Capability

The ST series is designed to offer additional power capability by adding a chassis in parallel to create a main/secondary configuration providing up to and beyond 100kW’s. The main chassis is the point of connection for customer interfacing; this multichassis system effectively functions as a single power supply. The main unit retains the full featured front panel, while secondary units have a Blank Front Panel. To configure an orderable model number, simply use Spellman’s applicable base ST model number and increment the power denominator in 12kW steps as required:


This would be an ST with a 60kV, positive polarity, providing 24kW’s of power (2 chassis)     

Rear panel showing connections for parallel operation:

ST High Voltage Power Supply (Image 2)

Rear panel showing connections for parallel operation

ST High Voltage Power Supply (Image 6)

Main/secondary 24kW ST

Arc Intervention

Spellman’s ST 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.


BFP - Blank Front Panel  
HS - High Stability  
LL(X) - High Voltage Cable Length  
400VAC - 360-528Vac Input  


Adjustable Overload Trip

Arc Trip Count

Arc Quench Time

Arc Re-Ramp Time

Constant Power Control

Adjustable Power Trip

Slow Start Ramp Times

Electronic Component (Power Source)

ST 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 ST series is not intended to be operated by end users as a stand-alone device. The ST 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 12,000 ST1*12
2 6,000 ST2*12
3 4,000 ST3*12
4 3,000 ST4*12
6 2,000 ST6*12
8 1,500 ST8*12
10 1,200 ST10*12
12 1,000 ST12*12
15 800 ST15*12
20 600 ST20*12
30 400 ST30*12
40 300 ST40*12
50 240 ST50*12
60 200 ST60*12
70 171 ST70*12
80 150 ST80*12
100 120 ST100*12
120 100 ST120*12
150 67 ST150*10
225  40  ST225*10

*Substitute “P” for positive polarity and “N” for negative polarity. Polarity must be specified at time of order. 1-10kV units are inherently reversible by design requir­ing an internal wiring change to swap polarities. Intermediate voltage units are available by special order. 150kV units are limited to a maximum output of 10kW’s 

NOTE: ST225 units cannot be paralled!

Parallel operation: Additional power can be provided in increments of 12kW’s by connecting chassis in parallel via the use of the ST’s main/secondary configuration.

Use the applicable base ST model number and increment the power denominated in 12kW steps as required.

ST10P24 10kV @ 24kW’s
ST10P36 10kV @ 36kW’s
ST10P48 10kV @ 48kW’s

ST 1-150kV rear panel view

ST 1-150kV rear panel view

ST 225V rear panel view


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
010Vdc = 0100% 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 010Vdc = 0100% rated output, Zout= 5KΩ, 1%
26 Spare  
27 Spare  
28 Remote Overvoltage Adjust
010Vdc = 0100% 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 010Vdc = 0100% rated output, Zin>10MΩ
43 Local Power Program Output
010Vdc = 0100% 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