Sensata Gigavac GX12FCB

Sensata Gigavac GX12FCB is a 225A 800VDC High Voltage DC Contactor from the GX12 series, designed for battery module isolation, converter input switching, charger interface control, and compact high-voltage DC distribution. This High Voltage DC Contactor uses an SPST-NO-DM contact form, a 48VDC coil, stud power terminals, long flying lead control termination, chassis mounting, auxiliary contact functionality, and hermetically sealed construction. It is a practical option when an OEM needs more current capacity than a 150A GX11 or GX21 device, but does not need a larger 400A GV24 platform.

GX12FCB is especially useful in systems where the contactor must be mounted near the DC bus while the control harness runs to a separate controller or interlock board. JB Controls lists this configuration with 122 cm flying leads, giving designers additional routing flexibility in battery cabinets, prototype power systems, and equipment compartments. The sealed GX12 design helps protect the contact system from dust, moisture, and contamination, supporting dependable switching in industrial and mobile environments.

Product Positioning

GX12FCB should be positioned as a mid-current High Voltage DC Contactor for 48V-controlled battery and power conversion equipment. It is not a miniature relay and it is not a heavy 600A main-line contactor. Its 225A current rating makes it suitable for medium-power branches, auxiliary battery outputs, DC/DC converter inputs, charger paths, and controlled high-voltage distribution circuits.

The 48VDC coil is the key differentiator for this model. Many battery racks, telecom-style backup systems, industrial controllers, and power conversion modules use 48V auxiliary power. Selecting GX12FCB allows the designer to use a High Voltage DC Contactor that matches that control architecture while still supporting 800VDC maximum switching capability.

Key Specifications

• Manufacturer series: Sensata Gigavac GX12
• Part number: GX12FCB
• Product type: High Voltage DC Contactor
• Contact form: SPST-NO-DM / 1 Form X
• Rated current: 225A
• Maximum switching voltage: 800VDC
• Coil voltage: 48VDC
• Termination style: stud terminals and wire leads
• Lead length: 122 cm / 48 in according to GX12 series listing
• Mounting type: chassis mount
• Auxiliary contacts: included
• Construction: hermetically sealed
• Operating temperature range: -55°C to +85°C
• Typical operate time: approximately 30ms according to distributor data
• Typical release time: approximately 12ms according to distributor data

Features and Benefits

The main benefit of GX12FCB is its balance of current capacity, voltage capability, and wiring flexibility. A High Voltage DC Contactor rated at 225A can handle meaningful DC power paths without forcing the designer into a larger high-current package. This helps reduce space and weight in compact battery systems, converter cabinets, service disconnect modules, and mobile power assemblies.

The 800VDC maximum switching rating gives GX12FCB useful design margin for elevated-voltage DC equipment. It can be applied in battery packs, charger support circuits, and converter interfaces where ordinary low-voltage relays are not suitable. The normally open contact behavior keeps the power path open until the 48VDC coil is energized, supporting controlled start-up, shutdown, and service isolation.

The auxiliary contacts support monitored switching. A controller can compare the coil command with auxiliary feedback to confirm whether the High Voltage DC Contactor changed state correctly. This is useful for battery modules and converter systems where sequencing, precharge confirmation, and fault diagnostics are important.

Long flying leads are useful in real equipment layouts. The contactor can be mounted close to high-current conductors while the coil and auxiliary leads route to a control board, interlock loop, or harness connector. Stud terminals provide secure power connections for cables or busbars, and chassis mounting supports rugged installation.

Hermetically sealed construction protects the internal contact system from environmental contamination. Dust, humidity, vibration, and temperature changes are common in industrial cabinets, mobile platforms, marine compartments, and battery enclosures. A sealed High Voltage DC Contactor helps maintain stable performance across long service intervals.

Applications

GX12FCB is especially suitable for battery modules and medium-current high-voltage DC branches. In a battery cabinet, this High Voltage DC Contactor can isolate a module output, connect a converter input, switch a charger interface, or disconnect a protected branch during service and fault conditions. The 225A rating makes it useful where a 150A contactor is too small and a 400A contactor is unnecessary.

The contactor can also be used in telecom backup power, industrial DC distribution, charger support equipment, inverter auxiliary paths, laboratory DC systems, and mobile electrification platforms. In these applications, GX12FCB provides controlled 800VDC-class switching with a 48V coil and feedback capability.

Selection Guide

Before selecting GX12FCB, confirm maximum DC voltage, continuous current, peak current, inrush current, switching frequency, and load type. This High Voltage DC Contactor is rated for 225A and up to 800VDC maximum switching, but final suitability depends on circuit energy, precharge design, cable sizing, thermal rise, fuse coordination, and environmental conditions.

The coil supply should be a stable 48VDC source. If the equipment uses 12VDC or 24VDC control power, another GX12 coil version may be more suitable. Designers should also verify lead routing, auxiliary contact wiring, stud terminal clearance, mounting orientation, vibration exposure, and service access.

FAQ

What is GX12FCB used for?

GX12FCB is used for battery modules, converter input switching, charger interfaces, medium-current DC distribution, and 800VDC-class controlled isolation.

Is GX12FCB a High Voltage DC Contactor?

Yes. GX12FCB is a Sensata Gigavac GX12 series High Voltage DC Contactor with 225A current rating and 800VDC maximum switching voltage.

What coil voltage does GX12FCB use?

GX12FCB uses a 48VDC coil, making it suitable for systems with a 48V auxiliary control supply.

Does GX12FCB include auxiliary contacts?

Yes. DigiKey lists GX12FCB with auxiliary contacts and hermetically sealed construction.

How is GX12FCB different from GX11TAB?

GX12FCB is a 225A GX12 contactor with 48VDC coil and long flying leads, while GX11TAB is a 150A GX11 contactor with 24VDC low-power coil.

Conclusion

GX12FCB is a 225A 800VDC High Voltage DC Contactor for battery modules, converter interfaces, charger support circuits, and medium-current DC distribution. With its Sensata Gigavac GX12 sealed construction, 48VDC coil, stud terminals, 122 cm flying leads, chassis mounting, and auxiliary contact functionality, it is a practical choice for OEM systems that need monitored 800VDC switching with flexible control wiring.