Sensata Gigavac GXNC14CCB

The Sensata Gigavac GXNC14CCB is a GXNC14 Series normally closed DC power contactor designed for high-current DC switching and fail-closed circuit applications. This model is configured with a 350 A current rating, 800VDC maximum switching voltage, a 24VDC coil, 48 inch flying leads, an SPST-NC main contact, and an SPST-NO auxiliary contact. The 800VDC value refers to the main power/load circuit, while the 24VDC value refers to the coil/control circuit used to operate the contactor.

Product Description

The Sensata Gigavac GXNC14CCB is not a standard normally open contactor. It is a normally closed high-current DC contactor built for systems where the main circuit must remain closed when the coil is not energized. In the de-energized state, the main contact is closed. When the 24VDC coil is energized, the main contact opens. When coil power is removed, the main contact returns to the closed position.

This behavior makes GXNC14CCB suitable for specialized fail-closed, discharge, bypass, dump, and safety-related DC control circuits. In these systems, the default state may need to connect a circuit rather than isolate it. This is the opposite of most GX, GV, HX, and MX normally open contactors, so the product title and backend attributes should clearly identify GXNC14CCB as a normally closed contactor.

The full model number is important. “GXNC14” identifies the normally closed 350 A, 800VDC contactor family. The first “C” indicates the 24VDC coil version with internal coil suppression. The second “C” indicates 48 inch flying leads. The final “B” is used for the normally open auxiliary contact configuration. The main contact is SPST-NC, while the auxiliary contact is SPST-NO and is intended for low-current feedback or control signaling.

Key Features

• Normally closed SPST-NC main contact for fail-closed DC circuit designs.
• 350 A current rating for high-current battery and power management systems.
• Switching capability from 12VDC up to 800VDC.
• 24VDC coil for common vehicle, industrial, and battery control systems.
• 48 inch flying leads for flexible installation in cabinets and vehicle harnesses.
• Normally open auxiliary contact for status feedback or control logic.
• Hermetically sealed EPIC construction for harsh operating environments.
• Built-in coil suppression, with no external diode normally required.
• Low continuous coil power for efficient battery-powered systems.
• Can be mounted in any position and exceeds IP67 and IP69K sealing requirements.

Applications

The Sensata Gigavac GXNC14CCB is commonly used in high-current DC systems where a normally closed contact path is required. Typical applications include battery system safety circuits, capacitor discharge circuits, DC bypass paths, dump switch circuits, power management systems, electric and hybrid vehicles, heavy-duty equipment, marine DC systems, renewable energy equipment, industrial automation, and high-voltage test equipment.

Because the main contact is normally closed, GXNC14CCB should be selected only when the system design specifically requires this operating behavior. For example, a controller may energize the coil during normal operation to hold a circuit open, then allow the circuit to close when control power is removed. This can be useful in discharge or fail-closed logic, but it is not the same function as a standard normally open battery disconnect contactor.

Design Notes

The 800VDC and 24VDC values describe separate electrical paths. The 800VDC rating belongs to the main contact/load circuit and describes the DC voltage range the contactor is designed to switch. The 24VDC rating belongs to the coil/control circuit that changes the contact state. A system may use a 24V controller output to operate the coil while the main terminals are connected to a much higher voltage DC bus.

GXNC14CCB uses a dual-coil design. Both coils are used during pickup, and then the contactor transitions to low continuous hold power. For pickup testing and control design, the coil voltage should be applied properly rather than slowly ramped from zero. The built-in coil suppression also means external suppression parts should follow the manufacturer’s application guidance, because adding a diode across the coil can slow release time and affect switching performance.

For capacitive loads, a pre-charge or discharge design should be evaluated carefully. The contactor provides the switching function, but the final circuit must include correctly sized resistors, fuses, wire, insulation spacing, thermal protection, and fault handling. The auxiliary contact can support feedback and diagnostics, but it is not a main power contact and must stay within its signal-level rating.

Why Choose Sensata Gigavac GXNC14CCB

GXNC14CCB is a strong choice when a system needs a sealed 350 A normally closed contactor with 24V control and long flying leads. Its hermetic construction helps protect the contact system from dust, moisture, vibration, and harsh environments, while the 48 inch leads make wiring easier in larger cabinets, vehicle platforms, and distributed battery systems.

For product listings, replacement orders, and inventory records, use the full name Sensata Gigavac GXNC14CCB. Do not shorten it to GXNC14 only, because the suffix identifies the coil voltage, lead length, and auxiliary contact configuration. Also do not list it as a normal GX14 contactor; the GXNC prefix identifies a normally closed main contact.

FAQ

Is GXNC14CCB normally open or normally closed?
The main power contact is normally closed, SPST-NC, 1 Form Y. This version also includes a normally open auxiliary contact.

Is GXNC14CCB 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 lead length does GXNC14CCB use?
GXNC14CCB uses 48 inch, or 122 cm, flying leads.

What is GXNC14CCB used for?
It is used where a normally closed high-current DC contact path is required, such as discharge, bypass, dump, and fail-closed circuits.