Sensata Gigavac G41B834

Sensata Gigavac G41B834 is a 5kV SPST-NC High Voltage Relay from the G41B series, designed for normally closed high-voltage switching in test equipment, discharge circuits, safety interlock paths, source isolation systems, and specialized control panels. This High Voltage Relay provides a 1 Form B contact arrangement, 30A contact rating, 26.5VDC coil, tungsten contact material, solder cup or solder turret termination, and chassis mounting. Unlike a normally open relay that closes only after coil power is applied, G41B834 keeps the contact path closed in the de-energized state and opens the circuit when the coil is energized.

The G41B834 configuration is useful when the default electrical state must remain closed for safety, discharge, grounding, or continuity purposes. In high-voltage systems, the default state of a relay can be just as important as its voltage and current rating. A normally closed High Voltage Relay such as G41B834 can support circuit behavior where a path should remain available until the controller intentionally opens it.

Product Positioning

G41B834 should be positioned as a 5kV normally closed High Voltage Relay for high-voltage control and protection circuits. It is not a high-current DC battery contactor and should not be marketed as a main traction or ESS output contactor. Its strength is in compact 5kV relay switching where SPST-NC behavior, 30A current capability, and reliable tungsten contacts are required.

Compared with G81AB57, which is a normally open 10kV relay, G41B834 is a normally closed 5kV relay with a higher 30A contact rating. Compared with G43C332, which uses SPDT transfer contacts, G41B834 provides a simpler normally closed on/off function. This makes the High Voltage Relay suitable for default-closed paths rather than source transfer switching.

Key Specifications

• Manufacturer series: Sensata Gigavac G41B
• Part number: G41B834
• Product type: High Voltage Relay
• Contact form: SPST-NC, 1 Form B
• Contact rating: 30A
• Maximum switching voltage: 5000VAC / 5000VDC
• Coil voltage: 26.5VDC
• Coil current: approximately 91.4mA according to DigiKey data
• Coil power: approximately 2.4W according to DigiKey data
• Coil resistance: approximately 290 ohms according to DigiKey data
• Contact material: tungsten
• Termination style: solder cup / solder turret
• Mounting type: chassis mount
• Must operate voltage: approximately 16VDC
• Must release voltage: approximately 1VDC
• Typical operate time: approximately 10ms
• Typical release time: approximately 10ms
• Operating temperature range: -55°C to +125°C

Features and Benefits

The main feature of G41B834 is its normally closed SPST contact arrangement. A normally closed High Voltage Relay keeps the contact path connected when the coil is not powered. This behavior is useful in systems where a discharge path, safety path, or default continuity path must be present unless the controller actively opens the relay.

The 5kV AC/DC switching capability makes G41B834 suitable for elevated-voltage circuits that exceed the limits of ordinary electromechanical relays. Its 30A contact rating also gives it more current capability than many compact signal-level high-voltage relays. This combination is useful for high-voltage test systems, capacitor networks, discharge switching, and industrial power control equipment.

Tungsten contacts support robust switching in demanding high-voltage applications. Tungsten is often selected where arc resistance and contact durability are important. For circuits that may switch stored energy or hot loads, the contact material should still be evaluated together with the complete load profile, switching frequency, and protection design.

The 26.5VDC coil is common in specialized industrial, aerospace-style, and high-reliability control systems. Designers should confirm that the coil driver can provide the required operate voltage and current, and that the circuit allows proper release when the relay is de-energized. Coil suppression, driver protection, and release timing should be reviewed at the system level.

Applications

G41B834 is especially suitable for normally closed high-voltage control circuits. In a test fixture, this High Voltage Relay can maintain a default discharge or grounding path until the controller energizes the coil to open it. In capacitor or pulse systems, it may be used as part of an energy management path when the voltage, current, and timing requirements match the relay rating.

The relay can also be used in hipot testers, insulation test equipment, high-voltage power supplies, source isolation panels, laboratory switching systems, and industrial safety circuits. Because it is SPST-NC, G41B834 is best for one controlled normally closed path. If the design needs a normally open enable path, an SPST-NO relay may be better. If the design needs transfer switching between two paths, an SPDT relay should be reviewed.

Selection Guide

Before selecting G41B834, confirm that the circuit needs a normally closed High Voltage Relay. This is the most important selection point. If the contact path should remain open when control power is removed, this model is not the correct contact form. If the path should remain closed by default and open only under command, G41B834 may be appropriate.

Engineers should verify maximum voltage, load current, hot switching current, load type, switching frequency, insulation spacing, and environmental conditions. Although distributor data lists 5000VAC and 5000VDC maximum switching with a 30A contact rating, the final circuit must account for stored energy, waveform, enclosure layout, altitude, contamination level, and safety margin.

The 26.5VDC coil should be matched to the available control supply. Mechanical design should also review solder termination access, chassis mounting, creepage and clearance, serviceability, and wiring strain relief.

FAQ

What is G41B834 used for?

G41B834 is used for normally closed high-voltage switching, discharge paths, grounding circuits, test equipment, source isolation, and specialized HV control systems.

Is G41B834 a High Voltage Relay?

Yes. G41B834 is a Sensata Gigavac G41B series High Voltage Relay with 5kV AC/DC switching capability and SPST-NC contact form.

What coil voltage does G41B834 use?

G41B834 uses a 26.5VDC coil. DigiKey lists approximately 91.4mA coil current, 2.4W coil power, and 290 ohms coil resistance.

Is G41B834 normally open or normally closed?

G41B834 is normally closed. It uses an SPST-NC, 1 Form B contact arrangement, so the contact path is closed when the coil is not energized.

How is G41B834 different from G81AB57?

G41B834 is a 5kV SPST-NC High Voltage Relay with 30A contact rating, while G81AB57 is a 10kV SPST-NO relay with a lower 5A contact rating.

Conclusion

G41B834 is a 5kV SPST-NC High Voltage Relay for normally closed high-voltage control, discharge, grounding, test, and isolation circuits. With its Sensata Gigavac G41B design, 30A contact rating, 26.5VDC coil, tungsten contacts, solder cup or solder turret termination, chassis mounting, and fast 10ms switching behavior, it is a practical option for systems that need a default-closed high-voltage relay rather than a normally open contactor.