Sensata Gigavac GX14CBB
The Sensata Gigavac GX14CBB is a GX14 Series hermetically sealed DC power contactor for high-current DC switching in demanding vehicle, battery, industrial, and renewable energy systems. This model is configured with a 350 A current rating, 800VDC maximum switching voltage, a 24VDC coil, 24 inch flying leads, an SPST-NO main contact, and an SPST-NO normally open auxiliary contact. The 800VDC rating applies to the main power/load circuit, while the 24VDC rating applies to the coil/control circuit used to operate the contactor.
| Category |
Relays - Contactors, Electromechanical |
| Manufacturer |
Sensata-Gigavac Clean Energy |
| Manufacturer Product Number |
GX14CBB |
| Series |
GX14 |
| Product Type |
Hermetically Sealed DC Power Contactor |
| Mounting Type |
Chassis Mount / Bottom Mount |
| Coil Voltage |
24VDC |
| Contact Form |
SPST-NO, 1 Form X Main Contact |
| Contact Rating Current |
350 A |
| Switching Voltage |
12VDC to 800VDC |
| Termination Style |
Stud, Wire Leads |
| Coil Termination |
24 inch / 61 cm Flying Leads |
| Power Terminals |
M10 Stainless Steel Studs |
| Auxiliary Contact |
SPST-NO, Normally Open, Mechanically Linked |
| Auxiliary Contact Rating |
2A at 24VDC Resistive Load |
| Operating Temperature |
-55°C to +85°C |
| Must Operate Voltage |
16 VDC |
| Must Release Voltage |
2 VDC |
| Operate Time |
20 ms Max |
| Release Time |
12 ms Max |
| Coil Current |
97 mA |
| Coil Power |
2.3 W |
| Coil Resistance |
247.42 Ohms |
| Mechanical Life |
1,000,000 Cycles |
| Contact Resistance |
0.4 mOhm Max; 0.15 to 0.3 mOhm Typical |
| Environmental Seal |
Hermetically Sealed, Exceeds IP67 and IP69K |
| Typical Weight |
Approx. 0.5 kg / 1.1 lb |
Product Description
The Sensata Gigavac GX14CBB is a 350 A DC contactor designed for reliable switching from low-voltage DC circuits up to 800VDC. As part of the GX14 Series, it combines a compact package, hermetically sealed construction, and high-current power handling for demanding electrical systems. It is suitable for electric vehicles, hybrid vehicles, heavy-duty vehicles, emergency vehicles, marine DC systems, industrial battery equipment, renewable energy systems, battery chargers, and power management cabinets.
GX14CBB uses a normally open main contact. In the de-energized state, the main power circuit is open and the load is isolated. When the 24VDC coil is energized, the contactor closes and current flows through the M10 power terminals. When coil power is removed, the contactor opens again. This makes the GX14CBB suitable for main battery disconnect, charge contactor, inverter input control, DC bus switching, auxiliary load control, and high-current load isolation.
The complete part number should be kept in backend records and customer-facing listings. “GX14” identifies the 350 A, 800VDC contactor family. The first “C” indicates the 24VDC coil version with internal coil suppression. The second “B” indicates 24 inch flying leads. The final “B” indicates an SPST normally open auxiliary contact. The main contact and auxiliary contact are both normally open, but they serve different purposes: the main contact switches the power circuit, while the auxiliary contact is used for low-current feedback.
Key Features
- 350 A current rating for high-current DC switching applications.
- Switching capability from 12VDC up to 800VDC.
- 24VDC coil for common vehicle, industrial, and battery control systems.
- SPST-NO main contact for controlled power connection and isolation.
- Normally open auxiliary contact mechanically linked to the main contacts.
- 24 inch flying leads for practical wiring in harnesses and cabinets.
- Hermetically sealed EPIC construction for harsh operating environments.
- Built-in coil suppression for simplified control circuit design.
- Low contact resistance for efficient high-current operation.
- Can be mounted in any position and exceeds IP67 and IP69K sealing requirements.
Applications
The Sensata Gigavac GX14CBB is commonly used in electric and hybrid vehicles, heavy trucks, buses, emergency vehicles, marine electrical systems, mining equipment, industrial automation, battery backup systems, fuel cell systems, battery chargers, solar power equipment, wind power systems, and DC power management equipment. Its 350 A current rating makes it a practical option where 150 A or 225 A contactors are too small, but a larger 600 A contactor is not required.
The normally open auxiliary contact can be used by a controller, battery management system, or diagnostic circuit to monitor contactor state. Because the auxiliary contact is mechanically linked to the main contacts, it provides useful status feedback for sequencing, interlock logic, and system confirmation. The auxiliary contact is a signal contact and should not be used as a power switching path.
Design Notes
The 800VDC and 24VDC values describe separate electrical paths. The 800VDC rating applies to the main power contacts and describes the load-side DC voltage range the contactor is designed to switch. The 24VDC rating applies to the coil circuit that actuates the contactor. A system can use a 24V controller output to operate the coil while the main terminals switch a much higher DC bus.
GX14CBB uses a dual-coil design. Both coils are used during pickup, and then the contactor transitions to low continuous hold power. The coil should be driven according to the product requirements, and pickup voltage should be applied properly during testing rather than slowly ramped from zero. The contactor includes internal coil suppression, so external suppression components should only be added if the full release-time and switching-performance effects are reviewed.
For capacitive loads such as inverter inputs, DC link capacitors, and battery power electronics, a pre-charge circuit is normally required before closing the main contactor. Pre-charge limits inrush current and helps protect the contactor contacts, fuses, busbars, cables, and connected equipment. Final design should also verify terminal torque, cable sizing, insulation spacing, current direction, thermal rise, enclosure protection, and fault current behavior.
Why Choose Sensata Gigavac GX14CBB
GX14CBB is a strong choice when a system needs a sealed 350 A DC contactor with 24V control, medium-length flying leads, and normally open auxiliary feedback. Compared with no-auxiliary versions, GX14CBB gives the control system a dedicated feedback contact. Compared with 15 inch lead versions, the 24 inch leads provide more installation flexibility without requiring the full 48 inch lead length.
For product listings, write the full name as Sensata Gigavac GX14CBB. Avoid shortening it to GX14, because related GX14 models may use 12VDC or 48VDC coils, 15 inch or 48 inch leads, no auxiliary contact, or a normally closed auxiliary contact. GX14CBB specifically identifies the 24VDC coil, 24 inch lead, normally open auxiliary version.
FAQ
Is GX14CBB an 800V or 24V contactor?
It uses both values for different circuits. The main contacts switch DC loads up to 800VDC, while the coil/control circuit is 24VDC.
What is the current rating of GX14CBB?
GX14CBB is rated for 350 A continuous current.
Is GX14CBB normally open?
Yes. The main power contact is SPST-NO, and this version also includes a normally open auxiliary contact.
What does the second B mean in GX14CBB?
The second character after the coil code indicates 24 inch flying leads. The final B indicates a normally open auxiliary contact.
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