Sensata Gigavac GX21BA

Sensata Gigavac GX21BA is a 150A 800VDC High Voltage DC Contactor from the GX21 series, designed for service equipment, compact battery systems, DC maintenance panels, charger support circuits, and moderate-current high-voltage switching. This High Voltage DC Contactor uses an SPST-NO-DM contact form, a 12VDC coil, stud power terminals, wire lead control termination, chassis mounting, and hermetically sealed construction. It is a practical option for equipment that needs 800VDC switching capability with a simple 12V control interface.

GX21BA is best suited to systems where the current path is meaningful but not large enough to require a 400A or 600A contactor. The 150A rating supports service disconnect circuits, auxiliary battery branches, smaller inverter inputs, charger paths, and protected DC distribution points. Its sealed construction helps protect the internal contact chamber from moisture, dust, and contamination, making this High Voltage DC Contactor useful in workshops, mobile service units, industrial cabinets, and compact power enclosures.

Product Positioning

GX21BA should be positioned as a 12V coil High Voltage DC Contactor for service equipment and compact DC switching assemblies. It is different from GX21CC, which uses a 24VDC coil, and different from GX21CBB, which is commonly listed with auxiliary contact functionality. GX21BA is the simpler choice when the equipment uses 12V auxiliary control power and does not require direct auxiliary feedback from the contactor.

The 12VDC coil is useful in service vehicles, portable battery tools, field maintenance equipment, small test fixtures, and compact power modules. Many of these systems already use 12V control electronics, so GX21BA can be integrated without adding a separate 24V or 48V control supply. This keeps the High Voltage DC Contactor configuration straightforward for practical equipment builds.

Key Specifications

• Manufacturer series: Sensata Gigavac GX21
• Part number: GX21BA
• Product type: High Voltage DC Contactor
• Contact form: SPST-NO-DM / 1 Form X
• Rated current: 150A
• Maximum switching voltage: 800VDC
• Coil voltage: 12VDC
• Coil current: approximately 680mA according to distributor data
• Coil power: approximately 8W according to distributor data
• Coil resistance: approximately 17.65 ohms according to distributor data
• Termination style: stud terminals and wire leads
• Mounting type: chassis mount
• Auxiliary contact: not listed in checked distributor data
• Construction: hermetically sealed
• Operating temperature range: -55°C to +85°C
• Typical operate time: approximately 20ms according to related GX21 listings
• Typical release time: approximately 12ms according to related GX21 listings

Features and Benefits

The main benefit of GX21BA is its 800VDC switching capability in a moderate-current 150A package. A High Voltage DC Contactor in this range is useful when the circuit voltage is high enough to require a sealed DC contactor, but the load current does not justify a larger high-current platform. This can help reduce size and simplify equipment layout.

The 12VDC coil supports common control architectures used in mobile and service equipment. Designers can drive the contactor from a 12V auxiliary system, control module, safety switch circuit, or battery-powered controller. This makes GX21BA suitable for systems where 24VDC control power is not available.

Stud terminals provide secure high-current connection points for cables or busbars. Wire leads allow the coil wiring to route back to the controller, switch panel, or interlock circuit. This format is convenient when the contactor must be mounted near the DC conductors while the control hardware sits elsewhere in the enclosure.

Hermetically sealed construction improves reliability in real operating environments. Dust, moisture, vibration, and temperature changes can reduce the life of open contactor designs. A sealed High Voltage DC Contactor helps maintain stable switching performance in service equipment, compact DC cabinets, mobile platforms, and industrial power modules.

Applications

GX21BA is especially suitable for service equipment and compact high-voltage DC assemblies. In a field service unit, battery maintenance tool, portable DC test setup, or compact charger cabinet, this High Voltage DC Contactor can isolate a battery branch, switch a charger interface, connect an inverter input, or disconnect a protected DC load during service and fault conditions.

The contactor can also be used in auxiliary battery systems, small energy storage modules, industrial DC distribution, mobile power equipment, charger support systems, and development benches. Its 150A rating makes it appropriate for moderate-current circuits where a small relay is not enough and a larger GX16 or GV24 contactor would be oversized.

Selection Guide

Before selecting GX21BA, confirm maximum DC voltage, continuous current, peak current, inrush current, switching frequency, and load type. This High Voltage DC Contactor is rated for 150A and up to 800VDC maximum switching, but final suitability depends on circuit energy, precharge design, cable sizing, thermal rise, fuse coordination, and operating environment.

The coil supply should be a stable 12VDC source. If the system uses 24VDC control power, GX21CC or another 24V GX21 configuration may be more suitable. If auxiliary contact feedback is required, choose a GX21 variant with auxiliary contacts, because GX21BA should be treated as a simple no-feedback configuration based on the checked public listings.

FAQ

What is GX21BA used for?

GX21BA is used for service equipment, compact battery systems, charger interfaces, auxiliary DC branches, and 800VDC-class moderate-current switching.

Is GX21BA a High Voltage DC Contactor?

Yes. GX21BA is a Sensata Gigavac GX21 series High Voltage DC Contactor with 150A contact rating and 800VDC maximum switching voltage.

What coil voltage does GX21BA use?

GX21BA uses a 12VDC coil. Distributor data lists approximately 680mA coil current and 8W coil power.

What termination style does GX21BA use?

GX21BA uses stud terminals for the power path and wire leads for the coil/control connection, with chassis mounting.

How is GX21BA different from GX21CC?

GX21BA uses a 12VDC coil, while GX21CC uses a 24VDC coil. Both are GX21 series 150A High Voltage DC Contactor options for 800VDC-class switching.

Conclusion

GX21BA is a 150A 800VDC High Voltage DC Contactor for service equipment, compact battery systems, charger support circuits, and moderate-current DC distribution. With its Sensata Gigavac GX21 sealed construction, 12VDC coil, SPST-NO-DM contact form, stud terminals, wire leads, and chassis mounting, it is a practical choice for OEM systems that need reliable 800VDC switching with simple 12V coil control.