High voltage relay
R41A Series
R41A series high voltage relays are designed to meet demanding load requirements while maintaining a compact form factor. The RF-rated design ensures exceptional performance in applications requiring precise switching and reliable isolation up to 5 kV. Equipped with tungsten contacts, the R41A delivers enhanced make and break load switching capabilities and can continuously carry up to 30 amps. Common applications include antenna tuning units (ATUs) and high voltage test equipment. Featuring a Single Pole Single Throw, Normally Open (SPST-NO) configuration, this relay offers a simple yet effective solution for isolation, utilizing a single stationary contact to maintain isolation until coil power is applied.
Key specifications
R41A Series at a glance
- Voltage
- 5 kV
- Current
- 30 A
- Contact form
- SPST-NO
- Dielectric
- Vacuum
| Voltage rating | 5 kV |
|---|---|
| Current rating (continuous, DC or 60 Hz) | 30 A |
| Contact arrangement | SPST-NO |
| Contact form | A = Normally Open |
| Operation | Make/Break Load Switching |
| Coil voltage | 12 or 26.5 VDC |
| Construction | Stacked ceramic |
| Dielectric | Vacuum |
| Contact material | Molybdenum/Tungsten |
| HV termination | Solder Tab |
| Coil termination | Bus Wire |
| Mounting | Standard or 3-hole Flange |
Datasheet
Full ratings, dimensions and drawings are in the R41A Series datasheet (PDF).
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Datasheet specifications
R41A Series performance
| Contact Arrangement | Form A, SPST-NO or Form B, SPST-NC |
|---|---|
| Max Operating Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 5.0 kV dc or 60 Hz; 4.5 kV dc at 2.5 MHz; 3.5 kV dc at 16 MHz; 2.8 kV dc at 32 MHz |
| Test Voltage (Peak, between Contacts and Contacts to Base) (Max Leakage Current: 15µA) | 6 kV dc or 60 Hz |
| Continuous Current, Max DC or 60 Hz | 30 A |
| Continuous Current, Max 2.5 MHz | 24 A |
| Continuous Current, Max 16 MHz | 16 A |
| Continuous Current, Max 32 MHz | 12 A |
| Capacitance – Across Open Contacts | 1.2 pF |
| Capacitance – Contacts to Ground | 1.2 pF |
| Coil Hi-Pot (V RMS, 60 Hz) | 500 V |
| Contact Resistance (Max) | 0.02 ohm @ 1 A |
| Operate Time (Max, incl bounce) | 10 ms |
| Release Time (Max) | 10 ms |
| Shock - Operating, 1/2 Sine, 11 ms | 50 G |
| Vibration, Operating, Sine (55-2,000 Hz) | 10 G |
| Operating Temperature | -55°C to 125°C |
| Ingress Protection | Hermetic, exceeds IP67 and IP6K9 |
| Mechanical life | 2,000,000 cycles |
| Weight | 28 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 | 70 Ω | 290 Ω |
From the R41A datasheet. The datasheet notes on coil temperature effects apply. Download the datasheet.
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Applications
Where the R41A 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 R41A Series?
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