High voltage relay
R20 Series
The R20 Series are vacuum-sealed ceramic high voltage relays designed for 28 kV system voltage applications requiring reliable no-load switching performance. Rated for continuous currents up to 110 A and peak operating voltages up to 28 kVDC or 60 Hz, the R20 Series provides stable electrical performance across DC and high frequency environments. Featuring a Form X (SPST-NO) contact arrangement, molybdenum/copper contacts, and M6 screw high voltage terminals, these relays are well suited for RF systems, test equipment, industrial high voltage platforms, and specialized power control applications where compact size, high voltage capability, and long mechanical life are required.
Key specifications
R20 Series at a glance
- Voltage
- 28 kV
- Current
- 110 A
- Contact form
- SPST-NO
- Dielectric
- Vacuum
| Voltage rating | 28 kV |
|---|---|
| Current rating (continuous, DC or 60 Hz) | 110 A |
| Contact arrangement | SPST-NO |
| Contact form | X = Normally Open |
| Operation | Carry Only |
| Coil voltage | 12 or 26.5 VDC |
| Construction | Bottle, square |
| Dielectric | Vacuum |
| Contact material | Molybdenum/Copper |
| HV termination | Screw |
| Coil termination | Turret Terminals |
| Mounting | Through Panel |
Datasheet
Full ratings, dimensions and drawings are in the R20 Series datasheet (PDF).
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Datasheet specifications
R20 Series performance
| Contact Arrangement | Form X, SPST – NO |
|---|---|
| Max Operating Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 28 kV dc or 60 Hz; 22 kV 2.5 MHz; 12 kV 16 MHz; 10 kV 32 MHz |
| Test Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 30 kV dc or 60 Hz |
| Continuous Current Carry, Max | 110 A dc or 60 Hz; 60 A 2.5 MHz; 40 A 13.56 MHz; 30 A 32 MHz |
| Load Switching (Make and Break) | (Consult Factory) |
| Coil Hi-Pot (V RMS, 60 Hz) | 500 V |
| Capacitance (Open Contacts) | 2.5 pF |
| Capacitance (Contacts to Ground) | 2.5 pF |
| Contact Resistance (Max) | 0.005 Ω @ 1 A, 28 VDC |
| Operate Time (Max, incl bounce) | 18 ms |
| Release Time (Max) | 10 ms |
| Shock, Operating, 1/2 Sine, 11 ms (Peak) | 30 G |
| Vibration, Operating, Sine (55-500 Hz Peak) | 10 G |
| Operating Temperature | -55°C to 125°C |
| Mechanical life | 2,000,000 cycles |
| Weight | 345 g |
| Coil (25 °C) | 12 VDC | 26.5 VDC |
|---|---|---|
| Nominal Voltage | 12 VDC | 26.5 VDC |
| Pick-up Voltage, Max | 8 VDC | 16 VDC |
| Drop-out Voltage | 0.5-5 VDC | 1.0-10 VDC |
| Coil Resistance (±10%) | 24 Ω | 120 Ω |
From the R20 datasheet. The datasheet notes on coil temperature effects apply. Download the datasheet.
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Applications
Where the R20 Series is used
ESD Protection and Controlled Discharge
Switching for ESD protection systems requiring controlled discharge paths.
High Power Test Systems and Load Banks
Switching and protection for load banks, dynos, and high-power test setups.
High Voltage Test Equipment
HV switching for test stands, labs, hipot systems, and simulation equipment.
Lightning and Surge Simulation
Switching for lightning strike and surge simulation and transient testing equipment.
Medical Devices and Therapy Systems
High voltage switching for medical diagnostic, therapy, and specialty equipment.
Scientific and Analytical Instrumentation
HV switching for scientific instruments, measurement systems, and laboratory setups.
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Questions about the R20 Series?
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