Sensata Gigavac G81AB57 High Voltage Relay Overview

The Sensata Gigavac G81AB57 is a G81A Series high voltage relay designed for SPST-NO switching in compact high-voltage circuits. It provides a 10kV maximum switching voltage, 5A contact current rating, 26.5VDC coil operation, stud termination, and chassis or panel mounting. This model is suitable for high voltage test equipment, RF systems, capacitor charge and discharge circuits, medical equipment, power supplies, instrumentation, and industrial high voltage control applications. In this model, 10kV refers to the high voltage contact switching capability, while 26.5VDC refers to the coil voltage used to operate the relay.

Product Description

The Sensata Gigavac G81AB57 high voltage relay is built for applications that require reliable normally open switching of high-voltage circuits. As part of the G81A high voltage relay family, it uses an SPST-NO contact arrangement, also described as 1 Form A. The contact remains open when the coil is not energized and closes when the 26.5VDC coil receives the proper control voltage.

The G81AB57 is rated for up to 10kV maximum switching voltage and 5A contact current. The 10kV value belongs to the high voltage contact circuit, while the 26.5VDC value belongs only to the relay coil. These are separate electrical paths. A low-voltage control circuit energizes the coil, and the relay then closes the high-voltage contact path for switching, routing, isolation, or test control.

A key advantage of the Sensata Gigavac G81AB57 is its compact high-voltage relay construction. The G81A platform is designed for applications where space is limited but reliable 10kV switching is required. It uses tungsten contact material, which is commonly selected for demanding high-voltage switching because it offers strong resistance to arcing and supports stable contact performance under difficult electrical conditions.

The G81AB57 uses stud termination and panel or chassis mounting, giving engineers a secure installation method inside high-voltage assemblies. The 10 ms operate time and 10 ms release time support responsive control in test systems, power supplies, RF equipment, and safety switching circuits. Its -55°C to 85°C operating temperature range also makes it suitable for industrial environments where temperature conditions may vary.

Key Features

• Genuine Sensata Gigavac G81A Series high voltage relay
• 10kV maximum switching voltage for high-voltage circuits
• 5A contact current rating
• SPST-NO contact form, also described as 1 Form A
• 26.5VDC coil voltage for control circuit operation
• Tungsten contact material for high-voltage switching
• Stud termination for secure electrical connection
• Panel or chassis mounting for high-voltage assemblies
• 10 ms operate time and 10 ms release time
• Wide operating temperature range from -55°C to 85°C

Applications

The Sensata Gigavac G81AB57 relay is commonly used in equipment that needs controlled connection or disconnection of a high-voltage circuit. Typical applications include high voltage test systems, RF and radar equipment, capacitor charge and discharge circuits, medical devices, power supplies, industrial instrumentation, laboratory equipment, and high-voltage control panels.

Because the G81AB57 is an SPST-NO relay, it is especially useful where the circuit should remain open until the control system intentionally energizes the coil. It can be used for high-voltage enable circuits, source connection, capacitor switching, test fixture control, power supply output switching, or safety interlock designs depending on the system architecture.

Why Choose Sensata Gigavac G81AB57

The Sensata Gigavac G81AB57 is a strong choice when the design requires a compact 10kV normally open high voltage relay with 26.5VDC coil operation and stud terminals. Compared with lower-voltage relays, this model is built for high-voltage insulation and switching requirements. Compared with SPDT relays, the SPST-NO contact form provides a simpler normally open switching path for designs that do not need transfer switching.

For replacement and maintenance projects, G81AB57 should be selected when the original system requires G81A Series performance, SPST-NO contact form, 10kV maximum switching voltage, 5A contact rating, 26.5VDC coil voltage, stud termination, and panel or chassis mounting. Before ordering, confirm coil voltage, contact form, switching voltage, current rating, mounting style, and terminal requirements.

FAQ

Q1: What is the full product name of G81AB57?
A1: The full product name is Sensata Gigavac G81AB57 High Voltage Relay.

Q2: Is G81AB57 a contactor or a relay?
A2: G81AB57 is a high voltage relay. DigiKey lists it under relays/contactors,