Glassman High Voltage is a leading designer and manufacturer of High Voltage power supplies/DC power supplies for the High Voltage and Vacuum Process equipment market segments. A Glassman DC power supply can range in output from 15W-50kW with output voltages operating down to 50V thru 400kV.  A High Voltage power supply of this type can be offered in modular or Rack-mount configuration as well as special packaging to meet customer-specific mechanical requirements. Most Glassman DC power supplies are offered utilizing proprietary Air Insulation dielectric technology. Air poses numerous reliability and serviceability benefits in comparison to competing solid and liquid dielectric technologies.
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LH Series
5 kW Regulated
High Voltage DC
Power Supplies

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LH Series HV Power Supply
Models from 0 to 1 kV through 0 to 150 kV, 10.50 H x 19 W x 24.0 D, 60 lbs.
The The LH family of power supplies are sophisticated, 5 kW, high voltage power supplies with low ripple and noise. They are air insulated, fast response units, with tight regulation.

Please refer to Technology > Applications page on our web site for typical applications

The LH Series, when configured with the 400 VAC Input Option, is fully compliant with the following European Harmonized EMI Directives:
EN61010/ IEC61010, Safety
EN61000-6-4, Conducted and Radiated Emissions
EN61000-6-2:2005, Conducted and Radiated Immunity.
2011/65/EU, Restriction of the use of hazardous substances (RoHS).

  • 1 kV to 150kV
  • Rack Mount
  • CE Compliant
  • Semi S2-93 Compliant
  • RoHS Compliant


Features Specifications Options Models Outline


Arc Quench. The HV output is inhibited for a short period after each load arc to help extinguish the arc.

Arc Count. Internal circuitry constantly senses and integrates arcs that occur over a given time. In the event a system or load arcing problem develops and exceeds factory- set parameters, the power supply will cycle off in an attempt to clear the fault and then automatically restart after a preset off dwell time.

Pulse-Width Modulation. Off-the-line pulse-width modulation provides high efficiency and a reduced parts count for improved reliability.

Low Ripple. Ripple is less than 0.05% RMS of rated voltage at full load.

Air Insulated. The LH Series features air as the primary dielectric medium. No oil or encapsulation is used to impede serviceability or increase weight.

Constant Voltage/Constant Current Operation. Automatic crossover from constant-voltage to constant-current regulation provides protection against overloads, arcs, and short circuits.

Constant Current/Current Trip. A rear panel switch allows selection of either current mode.

Redundant Thermal Overload Protection. Thermostats and fan RPM sensing shut down the power supply due to over temperature or reduced fan speeds.

Tight Regulation. Voltage regulation is better than 0.005% for allowable line variations and 0.01% for allowable load variations. Current regulation is typically better than 0.2% from short circuit to rated voltage.

Differentially Coupled Analog Control Signals. All voltage and current programming and monitoring signals are coupled to the user interface by true differential amplifiers. This provides for the ability to return the program and monitor commons to ground or system common at the source. This arrangement isolates the return wires and eliminates errors due to unwanted return currents flowing in these connections.

Warranty. Standard power supplies are warranted for three years; OEM and modified power supplies are warranted for one year. A formal warranty statement is available.


(Specifications apply from 5% to 100% rated voltage. Operation is guaranteed down to zero voltage with a slight degradation of performance.)

Input: 187 - 264 V RMS, Three-Phase, 48-63 Hz, 6500 VA maximum at full load. Less than 20 A per phase at 208 VAC. A five position rear terminal block with protective cover is provided.  Mains service must be protected with fuses or circuit breakers with a maximum rating of 100 A for 200/208 VAC models & 60 A for 400 VAC models.

Efficiency: Typically greater than 85% at full load.

Output: Continuous, stable, adjustment from 0 to rated voltage or current by panel mounted 10-turn potentiometers with 0.05% resolution, or by external 0 to 10 V signals is provided. Voltage accuracy is 0.5% of setting + 0.2% of rated.

Static Voltage Regulation: Better than 0.005% for specified line variations and 0.01% for no load to full load variations.

Dynamic Voltage Regulation: For load transients from 10% to 99% and 99% to 10%, typical deviation is less than 2% of rated output voltage with recovery to within 1% in 500 s and recovery to within 0.1% in 1 ms.  For 80-100KV models, V-Load regulation is 0.025%.

Ripple: Better than 0.05% RMS of rated voltage at full load.

Current Regulation: When in current regulation mode, 8-150 kV, better than 0.2%, 1-6 kV, better than 0.5% from short circuit to rated voltage at any load condition.

When in current trip mode the HV output will disable and latch off when the load current reaches the programmed current level. Reset is accomplished by either cycling the AC power or HV ON/OFF buttons, or by toggling the HV enable signal. A switch located on the rear panel allows the selection of current limit modes: constant current, or current trip.

Voltage Monitor: 0 to +10 V equivalent to 0 to rated voltage. Accuracy, 0.5% of reading + 0.2% of rated. Impedance is 10 KΩ

Current Monitor: 0 to +10 V equivalent to 0 to rated current. Accuracy: 1 kV to 6 kV: 1.5% of reading plus 0.5% of rated output. 8 kV to 150 kV: 1% of reading plus 0.2% of rated output. Impedance is 10 KΩ

Stability: 0.01% per hour after 1/2 hour warm-up, 0.05% per 8 hours.

Voltage Rise/Decay Time Constant: (Typical using either HV enable or remote programming control and a resistive load.)
1-6 kV: t = 50 ms with 4% min. load.
8-20 kV: t = 50 ms with 9% min. load.
25-100 kV: t = 200 ms with 7% min load.
125-150 kV: t = 400 ms with 8% min load.

Temperature Coefficient: 0.01%/C.

Ambient Temperature: -20 to +40C, operating; -40 to +85C, storage.

Protection: Automatic current regulation protects against all overloads, including arcs and short circuits. Thermal switches and RPM sensing fans protect against thermal overload. Fuses, surge-limiting resistors, and low energy components provide ultimate protection.

Arc Quench: Optional on models 1 kV through 6 kV; standard on models 8 kV through 150 kV. An arc quench feature provides sensing of each load arc and quickly inhibits the HV output for approximately 20 ms after each arc.

Arc Count: Optional on models 1 kV through 6 kV; standard on models 8 kV through 150 kV. Internal circuitry senses the number of arcs caused by external load discharges. If the rate of consecutive arcs exceeds approximately one arc per second for five arcs, the supply will turn off for approximately five seconds to allow clearance of the fault. After this period, the supply will return automatically to the programmed output voltage value with the voltage rise time constant indicated. If the load fault still exists, the above cycle will be repeated

External Interlock: Open = off, closed = on. Normally latching except for blank front panel version where it is non-latching.

Front Panel Elements: The front panel contains all local control functions. These control functions are: AC power on/off circuit breaker and indicator light, separate 10-turn controls with locking vernier dials used to set voltage and current levels, HIGH VOLTAGE ON switch, and HIGH VOLTAGE OFF/RESET switch. LED's indicate: when high voltage is on, output polarity, interlock, fault status, and whether the supply is operating in a voltage or current regulating mode. Output levels are indicated by voltage and current digital meters.

Rear Panel Elements: AC power entry terminal strip, power on indicator, ground stud, HV output connector, current limit/current trip switch, remote interface terminal strip and connector.

The remote interface terminal strip provides connections for the interlock circuit. In addition, jumpers on the terminal strip select local or remote operation of current program, voltage program and HV enable. Signal common and ground reference terminals are also provided.

The remote interface connector provides differential voltage and current program signals, high voltage enable, differential output voltage and current monitor signals, HV enable status, I/V regulation mode status, fault status, and a +10 V reference source. Signal common and ground reference terminals are also provided.

Remote HV Enable/Disable:
0 - 1.5 V = OFF,
2.5 - 15 V = ON.

Accessories: Remote interface mating connector and detachable, 8 foot, shielded high voltage coaxial cable provided. See Model Chart for cable type.

Weight: 60 pounds.


Symbol Description
200 180 to 220 VRMS, three phase input, 48-63 Hz, derate output current by 10%.
400 340 to 460 VRMS, three phase input, 48-63 Hz.  (Required for CE compliance.)
NC Blank front panel, power switch only.
ZR Zero start interlock. Voltage control, local or remote, must be at zero before HV will enable.
SS Slow start ramp. Specify standard times of 5, 10, 15, 20, or 30 seconds 20% .
5VC 0-5 V voltage and current program/monitor.
ARC For 1 to 6 kV models. Arc quench and arc count are provided as described in specifications for 8 to 150 kV models.
GE9 RS-232 control and monitor.
FG Common to ground isolation for 1 to 6 kV models. (Standard on 8 to 150 kV models.)


Click on the model number below to request a quote and for complete ordering part number.

Energy (J)
LH1R5.0 0-1kV 0-5.0A 3.5 RG-8U
LH1.5R3.3 0-1.5kV 0-3.3A 5.5 RG-8U
LH2R2.5 0-2kV 0-2.5A 3.8 RG-8U
LH3R1.7 0-3kV 0-1.7A 5.5 RG-8U
LH5R1.0 0-5kV 0-1.0A 3.5 RG-8U
LH6R850 0-6kV 0-850mA 5 RG-8U
LH8P630 LH8N630 LH8R630 0-8kV 0-630mA 6 RG-8U
LH10P500 LH10N500 LH10R500 0-10kV 0-500mA 7.5 RG-8U
LH12P420 LH12N420 LH12R420 0-12kV 0-420mA 11 RG-8U
LH15P330 LH15N330 LH15R330 0-15kV 0-330mA 7 RG-8U
LH20P250 LH20N250 LH20R250 0-20kV 0-250mA 10 RG-8U
LH25P200 LH25N200 LH25R200 0-25kV 0-200mA 7 DS2124
LH30P170 LH30N170 LH30R170 0-30kV 0-170mA 11 DS2124
LH40P125 LH40N125 LH40R125 0-40kV 0-125mA 14 DS2124
LH50P100 LH50N100 LH50R100 0-50kV 0-100mA 18 DS2124
LH60P85 LH60N85 LH60R85 0-60kV 0-85mA 21  DS2124
LH70P72 LH70N72 LH70R72 0-70kV 0-72mA 25 DS2124
LH80P63 LH80N63 LH80R63 0-80kV 0-63mA 28 DS2124
LH100P50 LH100N50 LH100R50 0-100kV 0-50mA 35 DS2124
LH125P32 LH125N32 LH125R32 0-125kV 0-32mA 40 DS2121
LH150P25 LH150N25 LH150R25 0-150kV 0-25mA 58 DS2121

Outline Drawing