Sensata Gigavac GX21BA DC Contactor Overview

The Sensata Gigavac GX21BA is a sealed hermetic DC contactor from the GX21 Series, designed for 150A current switching in power systems up to 800VDC. It uses a 12VDC internal coil, chassis mounting, stud and wire lead termination, and no auxiliary contact. This model is suitable for electric vehicles, battery energy storage systems, industrial DC power distribution, marine power control, solar equipment, power management systems, and OEM battery disconnect modules. In this model, 800VDC refers to the main contact switching voltage, while 12VDC refers to the coil voltage used to operate the contactor.

Product Description

The Sensata Gigavac GX21BA DC contactor is designed for reliable high-voltage DC switching in compact battery and power control systems. As part of the GX21 Series, this model provides a 150A contact current rating and up to 800VDC maximum switching voltage. It is commonly used in electric vehicles, battery energy storage systems, solar power equipment, marine power systems, industrial DC cabinets, and OEM battery disconnect assemblies.

The GX21BA uses an SPST-NO main contact arrangement, also described as 1 Form X. The main power contact remains open when the coil is not energized and closes when the 12VDC coil receives the correct control signal. This allows a low-voltage control circuit to manage a higher-voltage DC load path. The 800VDC value belongs to the main switching circuit, while the 12VDC value belongs only to the coil control circuit.

A key advantage of the Sensata Gigavac GX21BA is its sealed hermetic construction. The sealed contact chamber helps protect the internal contact system from dust, humidity, oxidation, and contamination. This makes the GX21BA suitable for mobile equipment, outdoor battery systems, industrial power modules, and vehicle platforms where vibration, moisture, and harsh operating conditions can reduce the service life of ordinary open-frame contactors.

This model uses stud and wire lead termination for harness-based installation. The configuration is practical for power distribution boxes, battery disconnect modules, EV control cabinets, and industrial assemblies where the main power terminals require secure stud connections and the coil circuit is routed through flying leads. Since GX21BA does not include an auxiliary contact, it is best suited for systems where separate contact feedback is not required or where status monitoring is handled by another circuit.

Key Features

• Genuine Sensata Gigavac GX21 Series DC contactor
• 150A contact rating for DC power control
• 800VDC maximum switching voltage for high-voltage systems
• 12VDC internal coil suppression for control circuit operation
• SPST-NO main contact form for normally open switching
• No auxiliary contact for simplified circuit designs
• Hermetically sealed construction for harsh environments
• Stud and wire lead termination for harness-based installation
• 20 ms operate time and 12 ms release time
• Suitable for EV, ESS, solar, marine, and industrial DC systems

Applications

The GX21BA DC contactor is suitable for systems that need reliable connection and disconnection of DC battery, load, or charging circuits. Typical applications include electric vehicles, battery energy storage systems, solar power equipment, DC power cabinets, marine battery systems, UPS battery modules, material handling equipment, and industrial automation systems.

In a battery system, the Sensata Gigavac GX21BA can be used as a main contactor, charge contactor, load disconnect contactor, or safety isolation device depending on the electrical design. Its 150A current rating makes it a good fit for medium-current DC platforms where sealed construction, compact size, and stable switching performance are required.

Why Choose Sensata Gigavac GX21BA

The Sensata Gigavac GX21BA is a practical option when the system requires 150A current capacity, up to 800VDC switching voltage, 12VDC coil operation, sealed construction, wire lead termination, and no auxiliary contact. Compared with versions that include auxiliary feedback, this model is simpler for designs where the controller does not need a separate auxiliary signal.

For replacement and maintenance projects, GX21BA should be selected when the original system requires GX21 Series performance with 150A contact rating, 800VDC maximum switching voltage, 12VDC coil voltage, chassis mounting, stud and wire lead termination, and no auxiliary contact. Before ordering, confirm coil voltage, auxiliary contact requirement, load current, switching voltage, mounting space, and terminal requirements.

FAQ

Q1: What is the full product name of GX21BA?
A1: The full product name is Sensata Gigavac GX21BA DC Contactor.

Q2: What is the main switching voltage?
A2: The main switching voltage is up to 800VDC maximum.

Q3: What does 12VDC mean?
A3: 12VDC is the coil voltage used to operate the contactor, not the main load voltage.

Q4: What is the current rating?
A4: The contact rating current is 150A.

Q5: Does GX21BA include an auxiliary contact?
A5: No. GX21BA does not include an auxiliary contact.

Q6: What is the difference between GX21BA and GX21BB?
A6: GX21BA has no auxiliary contact, while GX21BB includes a normally open auxiliary contact.