Sensata Gigavac HX21CCC

Sensata Gigavac HX21CCC is a 350A 1500VDC High Voltage DC Contactor from the HX21 series, designed for battery energy storage systems, high-voltage battery racks, DC link isolation, and monitored power conversion equipment. This High Voltage DC Contactor uses an SPST-NO-DM main contact form, a 24VDC coil, stud power terminals, flying lead control termination, chassis mounting, NC auxiliary contact functionality, and hermetically sealed construction. It is a strong option when an OEM needs 1500VDC-class isolation with higher current capacity than 300A HX22 configurations.

HX21CCC is especially useful in storage systems where contactor feedback must be integrated into the battery management or cabinet control sequence. The 350A current rating supports substantial charge and discharge paths, while the 1500VDC voltage class provides margin for high-voltage battery architectures. The sealed HX21 construction helps protect the contact chamber from moisture, dust, and contamination, supporting stable switching in energy cabinets, power conversion rooms, and industrial DC equipment.

Product Positioning

HX21CCC should be positioned as a battery storage High Voltage DC Contactor with NC auxiliary feedback. Compared with HX22CCC, this model provides a higher 350A current rating. Compared with HX21CAC, HX21CCC should be differentiated by its NC auxiliary contact positioning and battery storage isolation focus rather than charger-output switching. Compared with HX24 models, HX21CCC is suitable when 350A is sufficient and a larger 400A contactor is not required.

The NC auxiliary contact can be useful for interlock and diagnostic logic where the controller needs a defined feedback state when the main contactor is open. In battery storage systems, this can support precharge checks, cabinet enable logic, maintenance lockout, and abnormal-state detection before the inverter or charger is allowed to operate.

Key Specifications

• Manufacturer series: Sensata Gigavac HX21
• Part number: HX21CCC
• Product type: High Voltage DC Contactor
• Main contact form: SPST-NO-DM / 1 Form X
• Rated current: 350A
• Nominal switching voltage: 1500VDC
• Coil voltage: 24VDC
• Coil type: DC coil
• Power termination: stud terminals
• Control termination: flying leads / wire leads
• Mounting style: chassis mount / upright mount
• Auxiliary contact: included, NC auxiliary configuration referenced by distributor listing
• Construction: hermetically sealed
• Operating temperature range: -55°C to +85°C according to HX series distributor data

Features and Benefits

The main benefit of HX21CCC is its 350A current capacity combined with 1500VDC switching capability. A High Voltage DC Contactor in this class can support battery strings, DC bus sections, inverter inputs, and high-voltage cabinet branches where lower-voltage contactors would not provide enough margin.

The 24VDC coil matches common control systems used in BMS cabinets, industrial power converters, and energy storage equipment. Using a High Voltage DC Contactor with a 24V coil can simplify the auxiliary power design because the contactor can share the same control supply used by controllers, sensors, fans, and protection circuits.

The NC auxiliary contact supports supervised operation. A controller can compare the coil command with auxiliary feedback to confirm contactor state before closing a precharge circuit, enabling an inverter, or connecting a battery string. This feedback helps improve diagnostics and operating sequence control in monitored storage cabinets.

Stud terminals provide secure high-current connections for cables or busbars. Flying leads allow the coil and auxiliary circuits to route to a control board or interlock harness without forcing the contactor into a board-mounted layout. This makes HX21CCC practical for cabinet builds where high-voltage power wiring and low-voltage controls are separated.

Applications

HX21CCC is especially suitable for battery energy storage systems. In a storage cabinet, this High Voltage DC Contactor can isolate a battery string, connect a DC bus, switch a charge or discharge path, or open the circuit during service and fault events. The 350A rating gives it strong current capacity for substantial storage paths while remaining below the size class of larger 400A HX24 models.

The contactor can also be used in renewable energy converters, inverter cabinets, high-voltage DC distribution, industrial battery racks, and charger interface panels. In these applications, HX21CCC provides monitored 1500VDC-class switching with sealed construction and 24V control compatibility.

Selection Guide

Before selecting HX21CCC, confirm the maximum DC bus voltage, continuous current, peak current, inrush current, switching duty, and load type. This High Voltage DC Contactor is intended for 1500VDC-class systems and 350A current paths, but final suitability depends on precharge design, DC arc energy, thermal rise, busbar layout, cable sizing, and fuse coordination.

The coil supply should be a stable 24VDC source. Designers should also verify auxiliary contact logic, flying lead routing, terminal clearance, mounting orientation, and cabinet service access. If a 300A current class is enough, HX22 variants may be reviewed. If 400A is required, HX24 variants may be more appropriate.

FAQ

What is HX21CCC used for?

HX21CCC is used for battery energy storage systems, high-voltage battery racks, inverter inputs, DC bus isolation, and 1500VDC monitored switching.

Is HX21CCC a High Voltage DC Contactor?

Yes. HX21CCC is a Sensata Gigavac HX21 series High Voltage DC Contactor with 350A current rating and 1500VDC nominal switching capability.

What coil voltage does HX21CCC use?

HX21CCC uses a 24VDC coil, making it suitable for BMS cabinets and industrial control systems with a 24V auxiliary supply.

Does HX21CCC include auxiliary contacts?

Yes. Distributor data lists HX21CCC with auxiliary contact functionality, and RS references an NC configuration.

How is HX21CCC different from HX22CCC?

HX21CCC is a 350A HX21 contactor, while HX22CCC is commonly listed as a 300A HX22 contactor. Both are 1500VDC High Voltage DC Contactor options with 24VDC coil configurations.

Conclusion

HX21CCC is a 350A 1500VDC High Voltage DC Contactor for battery energy storage, high-voltage battery racks, inverter cabinets, and monitored DC distribution. With its Sensata Gigavac HX21 sealed construction, 24VDC coil, stud terminals, flying leads, chassis mounting, and NC auxiliary contact functionality, it is a practical choice for OEM systems that need reliable 1500VDC switching with strong current capacity and feedback support.