Sensata Gigavac GX21CBB

Sensata Gigavac GX21CBB is a 150A 800VDC High Voltage DC Contactor from the GX21 series, designed for marine DC systems, auxiliary battery circuits, compact inverter branches, and monitored high-voltage distribution panels. This High Voltage DC Contactor uses an SPST-NO-DM contact form, a 24VDC coil, stud power terminals, wire lead control termination, chassis mounting, auxiliary contact functionality, and hermetically sealed construction. It is a practical option when a system needs 800VDC switching capability with moderate current capacity and contact status feedback.

GX21CBB is best suited to applications where the main power path is not large enough to require a 400A or 600A contactor, but the voltage level and reliability requirements are still demanding. The 150A current rating supports auxiliary DC buses, charger support circuits, smaller inverter inputs, battery branch isolation, and marine electrical distribution. The sealed GX21 construction helps protect the internal contact system from dust, humidity, salt-air exposure, and contamination that may be present in marine or industrial environments.

Product Positioning

GX21CBB should be positioned as a monitored High Voltage DC Contactor for compact 800VDC-class power systems. Compared with GX21CC, this model is better suited when auxiliary contact feedback is required. Compared with GX11TAB, GX21CBB remains in the 150A class but is positioned for flexible stud-and-lead installation in equipment where the contactor is mounted near the power conductors and the control wiring routes back to a separate controller.

The 24VDC coil is useful for marine systems, industrial controls, and mobile power platforms that already use a 24V auxiliary supply. The auxiliary contacts allow the controller to confirm switching status, support interlock logic, and detect abnormal contactor behavior. This makes the High Voltage DC Contactor more suitable for supervised DC switching than a simple no-feedback configuration.

Key Specifications

• Manufacturer series: Sensata Gigavac GX21
• Part number: GX21CBB
• Product type: High Voltage DC Contactor
• Contact form: SPST-NO-DM / 1 Form X
• Rated current: 150A
• Maximum switching voltage: 800VDC
• Coil voltage: 24VDC
• Coil type: DC coil
• Termination style: stud terminals and wire leads
• Mounting type: chassis mount
• Auxiliary contacts: included
• Construction: hermetically sealed
• Operating temperature range: -55°C to +85°C
• Must operate voltage: approximately 16VDC according to distributor data
• Must release voltage: approximately 0.5VDC according to distributor data
• Typical operate time: approximately 20ms
• Typical release time: approximately 12ms

Features and Benefits

The main benefit of GX21CBB is its combination of 800VDC switching capability, 150A current rating, and auxiliary feedback in a compact sealed package. A High Voltage DC Contactor in this class can control meaningful DC loads while avoiding the size of larger high-current contactors. This is useful in marine battery systems, compact DC cabinets, charger support branches, and auxiliary high-voltage circuits.

The auxiliary contact is important for monitored switching. A controller can compare the coil command with contact feedback before enabling an inverter, charger, or downstream load. In marine and mobile DC systems, this can support safer start-up sequencing, service isolation, fault detection, and controlled shutdown behavior.

Stud power terminals provide secure connection points for high-current cables or busbars. Wire leads allow the coil and auxiliary circuits to be routed through a harness to the control board or interlock system. This installation format gives equipment designers flexibility when the power section and control electronics are separated.

The hermetically sealed design helps protect the contact chamber from environmental contamination. Marine compartments, outdoor cabinets, and mobile equipment can expose components to moisture, vibration, temperature change, and airborne particles. A sealed High Voltage DC Contactor helps maintain consistent switching performance across long service intervals.

Applications

GX21CBB is especially suitable for marine DC systems and monitored auxiliary power distribution. In an electric or hybrid marine panel, this High Voltage DC Contactor can isolate a battery branch, connect an inverter input, switch a charger interface, or disconnect a protected DC circuit during service and fault events. The 150A rating makes it suitable for moderate-current branches where larger contactors would be oversized.

The contactor can also be used in compact energy storage modules, industrial DC distribution, mobile power equipment, battery test fixtures, charger support systems, and auxiliary high-voltage loads. In these applications, GX21CBB provides controlled 800VDC-class switching with 24V coil control and feedback capability.

Selection Guide

Before selecting GX21CBB, 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, thermal rise, cable sizing, fuse coordination, and environmental conditions.

The coil supply should be a stable 24VDC source. Designers should verify coil driver capacity, auxiliary contact wiring, lead routing, mounting orientation, stud terminal clearance, and enclosure protection. If the system does not require feedback, a no-auxiliary GX21 variant may be simpler. If the system requires higher current, a GX16, GV24, or HX family contactor should be reviewed.

FAQ

What is GX21CBB used for?

GX21CBB is used for marine DC systems, auxiliary battery branches, charger interfaces, compact inverter inputs, and monitored 800VDC-class DC switching.

Is GX21CBB a High Voltage DC Contactor?

Yes. GX21CBB is a Sensata Gigavac GX21 series High Voltage DC Contactor with 150A contact rating and 800VDC maximum switching voltage.

What coil voltage does GX21CBB use?

GX21CBB uses a 24VDC coil. Distributor data lists approximately 16VDC must-operate voltage and 0.5VDC must-release voltage.

Does GX21CBB include auxiliary contacts?

Yes. Distributor data lists GX21CBB with auxiliary contacts and hermetically sealed construction, making it suitable for monitored switching systems.

How is GX21CBB different from GX21CC?

GX21CBB is commonly listed with auxiliary contacts, while GX21CC is better treated as a simpler GX21 configuration. Both are 150A 800VDC GX21 High Voltage DC Contactor options with 24VDC coil control.

Conclusion

GX21CBB is a 150A 800VDC High Voltage DC Contactor for marine DC systems, compact battery branches, charger support circuits, inverter inputs, and monitored auxiliary distribution. With its Sensata Gigavac GX21 sealed construction, 24VDC coil, stud terminals, wire leads, chassis mounting, and auxiliary contacts, it is a practical choice for OEM systems that need reliable moderate-current DC isolation with feedback capability.