High voltage relay
R8 Series
R8 series high voltage relays are a variant of the R2 series, featuring molybdenum/tungsten contacts for enhanced make and break load switching and offering the same 15 kV voltage rating. While the R8 series offers improved performance in switching, it has a higher contact resistance compared to the R2, resulting in a reduced 30 amp continuous current carry rating. Single Pole Double Throw (SPDT) configuration provides design flexibility by incorporating both Normally Open (NO) and Normally Closed (NC) contact sets within a single relay. Continuity transfers between the contact sets when the coil is powered on or off.
Key specifications
R8 Series at a glance
- Voltage
- 15 kV
- Current
- 30 A
- Contact form
- SPDT
- Dielectric
- Vacuum
| Voltage rating | 15 kV |
|---|---|
| Current rating (continuous, DC or 60 Hz) | 30 A |
| Contact arrangement | SPDT |
| Contact form | C = Single Pole Double Throw |
| Operation | Make/Break Load Switching - Limited |
| Coil voltage | 12 or 26.5 VDC |
| Construction | Bottle |
| Dielectric | Vacuum |
| Contact material | Molybdenum/Tungsten |
| HV termination | Solder Pot or Screw |
| Coil termination | Turret Terminals |
| Mounting | Through Panel or Flange |
Datasheet
Full ratings, dimensions and drawings are in the R8 Series datasheet (PDF).
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Datasheet specifications
R8 Series performance
| Contact Arrangement | Form C, SPDT (Single Pole Double Throw) |
|---|---|
| Max Operating Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 15 kV dc or 60 Hz; 12 kV at 2.5 MHz; 9 kV at 16 MHz; 7 kV at 32 MHz |
| Test Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 17 kV dc or 60 Hz |
| Continuous Current DC or 60 Hz | 30 A |
| Continuous Current 2.5 MHz | 18 A |
| Continuous Current 16 MHz | 10 A |
| Continuous Current 32 MHz | 6 A |
| Capacitance – Across Open Contacts | 0.5 pF |
| Capacitance – Contacts to Ground | 1.0 pF |
| Load Switching (Make and Break) | Limited - (Consult Factory) |
| Coil Hi-Pot (V RMS, 60 Hz) | 500 V |
| Contact Resistance (Max) | 0.025 Ω @ 1 A |
| Operate Time (Max, incl bounce) | 15 ms |
| Release Time (Max) | 9 ms |
| Shock - Operating, 1/2 Sine, 11 ms | 50 G |
| Vibration (55-500 Hz Peak) | 10 G |
| Operating Temperature | -55°C to 125°C |
| Mechanical life | 1,000,000 cycles |
| 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%) | 60 Ω | 270 Ω |
From the R8 datasheet. The datasheet notes on coil temperature effects apply. Download the datasheet.
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Applications
Where the R8 Series is used
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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