High voltage relay
R81C Series
R81C series high voltage relays are designed to meet demanding load requirements. Available in a variety of compact form factors, this relay utilizes a high dielectric encapsulant to provide superior external isolation. The RF-rated design ensures exceptional performance in applications requiring precise switching and reliable isolation up to 7 kV. Equipped with tungsten contacts, the R81C delivers enhanced make and break load switching capabilities and can continuously carry 5 or 10 amps, depending on the termination type. Common applications include antenna tuning units (ATUs) and high voltage test equipment. The 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
R81C Series at a glance
- Voltage
- 7 kV
- Current
- 5 A or 10 A
- Contact form
- SPDT
- Dielectric
- Vacuum
| Voltage rating | 7 kV |
|---|---|
| Current rating (continuous, DC or 60 Hz) | 5 A or 10 A |
| Contact arrangement | SPDT |
| Contact form | C = Single Pole Double Throw |
| Operation | Make/Break Load Switching |
| Coil voltage | 12 or 26.5 VDC |
| Construction | Stacked ceramic |
| Dielectric | Vacuum |
| Contact material | Molybdenum/Tungsten |
| HV termination | PCB Pins (5 A max) or Flying Leads (10 A max) |
| Coil termination | PCB Pins |
| Mounting | PCB Mount |
Datasheet
Full ratings, dimensions and drawings are in the R81C Series datasheet (PDF).
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Datasheet specifications
R81C Series performance
| Contact Arrangement | Form C, SPDT |
|---|---|
| Max Operating Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 7 kV dc or 60 Hz |
| Test Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 8 kV dc or 60 Hz |
| Continuous Current, Max | 5 A 5X .025 [0.64 mm] PCB Mount Version Only; 10 A Flying Lead Version Only |
| Contact Resistance (Max) | 0.050 Ω @ 1 A |
| Operate Time (Max, incl bounce) | 10 ms |
| Release Time (Max) | 10 ms |
| Shock - Functional, 1/2 Sine, 11 ms | 30 G |
| Vibration, Operating, Sine (50-2,000 Hz) Peak | 10 G |
| Operating Temperature | -50°C to 85°C |
| Ingress Protection | Hermetic, exceeds IP67 and IP6K9 |
| Mechanical life | 2,000,000 cycles |
| Weight | 70 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 | 1-10 VDC |
| Coil Resistance | 70 Ω | 290 Ω |
From the R81C datasheet. The datasheet notes on coil temperature effects apply. Download the datasheet.
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Applications
Where the R81C Series is used
High Power Test Systems and Load Banks
Switching and protection for load banks, dynos, and high-power test setups.
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 R81C Series?
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