Sensata Gigavac GXNC14CB Normally Closed DC Contactor

The Sensata Gigavac GXNC14CB is a sealed normally closed DC contactor from the GXNC14 Series, designed for 350A current switching in power systems up to 800VDC. It uses a 24VDC control coil, chassis mounting, stud and wire lead termination, and an SPST-NC main contact arrangement. This model is suitable for EV battery systems, battery energy storage equipment, industrial DC power distribution, marine power control, emergency disconnect circuits, discharge circuits, and safety control applications. In this model, 800VDC refers to the main contact switching voltage, while 24VDC refers to the coil voltage used to operate the contactor.

Product Description

The Sensata Gigavac GXNC14CB DC contactor is designed for systems that require a normally closed high-current DC switching path. Unlike standard normally open GX contactors, the GXNC14CB contact path is closed when the coil is not energized and opens when the 24VDC coil receives the correct control voltage. This makes it useful in circuits where the default state must remain connected, or where a fail-state connection, discharge path, or safety logic requires normally closed operation.

The GXNC14CB uses an SPST-NC contact arrangement, also described as 1 Form Y. The main contact rating is 350A, and the maximum switching voltage is 800VDC. The 800VDC value belongs to the main power switching path, while the 24VDC value belongs only to the coil circuit. These are separate electrical paths, so the control system can use a low-voltage coil signal to manage a high-voltage and high-current DC circuit.

A key advantage of the Sensata Gigavac GXNC14CB is its hermetically sealed construction. The sealed body helps protect the internal contact system from dust, moisture, oxidation, and contamination. This is important for electric vehicles, mobile machinery, outdoor power equipment, industrial battery systems, and marine electrical systems where vibration, humidity, and harsh operating conditions can reduce the service life of ordinary open-frame contactors.

The GXNC14 Series is built for normally closed DC switching applications where reliability and compact packaging are important. The GXNC14CB uses stud and wire lead termination, making it practical for harness-based installation in battery boxes, control cabinets, and power distribution assemblies. Its chassis mount format provides a secure installation method for high-current DC systems.

Key Features

• Genuine Sensata Gigavac GXNC14 Series normally closed DC contactor
• 350A contact rating for high-current DC power control
• 800VDC maximum switching voltage for high-voltage systems
• 24VDC coil for control circuit operation
• SPST-NC main contact form, also described as 1 Form Y
• No auxiliary contact for simplified normally closed designs
• Hermetically sealed construction for harsh environments
• Stud and wire lead termination for harness-based installation
• 12 ms operate time and 20 ms release time
• Suitable for fail-state, discharge, safety, and DC power control circuits

Applications

The GXNC14CB DC contactor is suitable for systems that require normally closed switching of a high-current DC circuit. Typical applications include EV battery systems, battery energy storage systems, discharge circuits, emergency control circuits, industrial DC power distribution, marine battery systems, power management equipment, and safety-related DC control modules.

In a battery system, the Sensata Gigavac GXNC14CB can be used where the circuit must remain closed without coil power and open only when the control system energizes the coil. This is different from a standard main battery contactor position, which usually uses a normally open contactor. Before using GXNC14CB as a replacement, engineers should confirm that the original system requires normally closed contact logic.

Why Choose Sensata Gigavac GXNC14CB

The Sensata Gigavac GXNC14CB is a strong option when the system requires 350A current capacity, up to 800VDC switching voltage, 24VDC coil operation, sealed construction, chassis mounting, and normally closed contact logic. Compared with normally open contactors, this model is better suited for default-closed circuit requirements. Compared with open-frame devices, the hermetic seal helps improve reliability in vibration, moisture, and contamination-prone environments.

For replacement and maintenance projects, GXNC14CB should be selected when the original system requires GXNC14 Series performance with SPST-NC contact form, 350A contact rating, 800VDC maximum switching voltage, 24VDC coil voltage, chassis mounting, stud/wire lead termination, and no auxiliary contact. Before ordering, confirm contact logic, coil voltage, switching voltage, load current, mounting space, and terminal requirements.

FAQ

Q1: What is the full product name of GXNC14CB?
A1: The full product name is Sensata Gigavac GXNC14CB Normally Closed DC Contactor.

Q2: Is GXNC14CB normally open or normally closed?
A2: GXNC14CB is normally closed. Its contact form is SPST-NC, also described as 1 Form Y.

Q3: What is the main switching voltage?
A3: The main switching voltage is up to 800VDC maximum.

Q4: What does 24VDC mean?
A4: 24VDC is the coil voltage used to operate the contactor, not the main load voltage.

Q5: What is the current rating?
A5: The contact rating current is 350A.

Q6: What is the difference between GXNC14CA and GXNC14CB?
A6: Both are GXNC14 normally closed contactors with 350A rating and 24VDC coil. GXNC14CB is listed with flying lead termination; confirm the mechanical and wiring configuration before replacement.