Sensata Gigavac SGX251BXX

Sensata Gigavac SGX251BXX is a 250A 750VDC High Voltage DC Contactor from the SGX25 series, designed for compact EV service modules, battery interface units, charger support circuits, and high-voltage DC switching assemblies that need a 12VDC coil. This High Voltage DC Contactor uses an SPST-NO 1 Form A contact arrangement, connectorized wire leads, upright chassis mounting, screw-terminal power connection, no auxiliary contact, and hermetically sealed construction. It is a practical option when the system needs 750VDC-class switching in a smaller 250A package rather than a larger 350A, 500A, or 600A contactor.

SGX251BXX is part of the SGX square ceramic sealed contactor family. It is built for applications where compact size, predictable coil control, and sealed high-voltage switching are important. The 250A rating supports meaningful DC current paths, while the 750VDC switching voltage makes the contactor suitable for elevated-voltage battery and power conversion systems. The sealed design helps protect the internal contact system from moisture, dust, and contamination, supporting stable performance in vehicle modules, industrial power boxes, and cabinet-mounted DC equipment.

Product Positioning

SGX251BXX should be positioned as a compact 12V coil High Voltage DC Contactor for EV service modules and medium-current high-voltage DC control. Compared with SGX151 models, it provides a higher 250A current rating. Compared with SGX401 models, it is smaller and better matched to circuits that do not require 400A capacity. Compared with GV, GX, or HX heavy-duty platforms, SGX251BXX is focused on compact SGX installation, 750VDC operation, and connectorized control wiring.

The no-auxiliary-contact configuration is suitable for systems that verify operation through voltage sensing, current sensing, controller logic, or system response rather than through a separate auxiliary feedback contact. In compact EV service modules, battery maintenance equipment, and charger support boxes, this High Voltage DC Contactor can provide the main switching function while keeping the control harness simple.

Key Specifications

• Manufacturer series: Sensata Gigavac SGX25 / SGX250
• Part number: SGX251BXX
• Product type: High Voltage DC Contactor
• Contact form: SPST-NO, 1 Form A
• Rated current: 250A
• Rated switching voltage: 750VDC
• Coil voltage: 12VDC
• Termination style: screw terminal and wire leads with connector
• Power connection: M6 internal threaded screw connection according to Sensata data
• Mounting style: upright chassis mount / M5 mounting screw
• Auxiliary contact: without auxiliary contact
• Construction: hermetically sealed ceramic contactor design
• Operating temperature range: -40°C to +85°C
• Must operate voltage: approximately 9VDC according to DigiKey data
• Must release voltage: approximately 1VDC according to DigiKey data
• Operate time: up to 30ms according to public data
• Release time: up to 10ms according to public data

Features and Benefits

The main benefit of SGX251BXX is its compact 250A rating with 750VDC switching capability. A High Voltage DC Contactor in this range can support battery interface circuits, charger paths, converter inputs, service disconnect modules, and protected DC branches where smaller relays are not suitable and larger heavy-current contactors would be oversized.

The 12VDC coil is a practical advantage for vehicle-style and service equipment control systems. Many compact EV modules, battery tools, mobile power units, and service panels use 12V control electronics. Selecting SGX251BXX allows the contactor coil to operate from that common auxiliary voltage without adding a 24V or 48V control supply.

The connectorized wire lead interface helps simplify installation. Connector-based control wiring can reduce assembly variation and make replacement easier than loose lead routing in some equipment designs. This is useful when the High Voltage DC Contactor is installed inside a compact power module or serviceable cabinet.

The upright chassis mount format supports straightforward mechanical integration. The contactor can be fixed in a cabinet or module while the power path connects through screw terminals. This installation style is appropriate for compact battery interface boxes, charger support modules, EV service equipment, and industrial DC control assemblies.

Hermetically sealed construction helps protect the contact chamber from environmental contamination. A sealed High Voltage DC Contactor is useful where dust, humidity, vibration, and temperature variation can affect open contactor designs. SGX251BXX is therefore suitable for equipment that requires stable switching over repeated service cycles.

Applications

SGX251BXX is especially suitable for compact EV service modules. In an EV battery service unit, charger support box, or portable DC power module, this High Voltage DC Contactor can connect a battery path, isolate a charger interface, switch a converter input, or disconnect a protected DC branch during maintenance and fault conditions.

The contactor can also be used in battery interface units, medium-current DC distribution cabinets, industrial power conversion equipment, test fixtures, renewable energy support circuits, and auxiliary high-voltage switching systems. Its 250A current rating fits applications where 150A contactors are too small but 350A or 400A devices add unnecessary size.

Selection Guide

Before selecting SGX251BXX, confirm maximum DC voltage, continuous current, peak current, inrush current, switching frequency, and load type. This High Voltage DC Contactor is intended for 250A and 750VDC-class switching, but final suitability depends on circuit energy, precharge design, cable sizing, thermal rise, fuse coordination, and enclosure conditions.

The coil supply should be a stable 12VDC source. If the equipment uses 24VDC control power, SGX251CXX may be more appropriate. If auxiliary feedback is required, choose an SGX variant with auxiliary contact functionality rather than SGX251BXX. Mechanical checks should include screw terminal access, connector clearance, mounting orientation, vibration exposure, insulation spacing, and service access.

FAQ

What is SGX251BXX used for?

SGX251BXX is used for compact EV service modules, battery interface circuits, charger support paths, converter inputs, and 750VDC-class medium-current switching.

Is SGX251BXX a High Voltage DC Contactor?

Yes. SGX251BXX is a Sensata Gigavac SGX series High Voltage DC Contactor with 250A current rating and 750VDC switching capability.

What coil voltage does SGX251BXX use?

SGX251BXX uses a 12VDC coil. DigiKey lists approximately 9VDC must-operate voltage and 1VDC must-release voltage.

Does SGX251BXX include auxiliary contacts?

No. Sensata lists SGX251BXX as a without-auxiliary configuration, making it suitable for systems that do not need direct contact feedback.

How is SGX251BXX different from SGX251CXX?

SGX251BXX uses a 12VDC coil, while SGX251CXX uses a 24VDC coil. Both are SGX25 series 250A 750VDC High Voltage DC Contactor options without auxiliary contacts.

Conclusion

SGX251BXX is a 250A 750VDC High Voltage DC Contactor for compact EV service modules, battery interface units, charger support circuits, and medium-current high-voltage DC switching. With its Sensata Gigavac SGX sealed ceramic construction, 12VDC coil, SPST-NO contact form, connectorized wire leads, upright chassis mounting, and no-auxiliary-contact configuration, it is a practical choice for OEM systems that need reliable 750VDC switching in a compact 250A package.