Sensata Gigavac GX21KC DC Contactor

The Sensata Gigavac GX21KC is a sealed hermetic DC contactor from the GX21 Series, designed for 150A current switching in power systems up to 800VDC. It uses a 120VAC control coil, chassis mounting, stud and wire lead termination, 122 cm / 48 in flying leads, 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 120VAC refers to the coil voltage used to operate the contactor.

Product Description

The Sensata Gigavac GX21KC 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 GX21KC 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 120VAC coil receives the correct control signal. This allows an AC control circuit to manage a higher-voltage DC load path. The 800VDC value belongs to the main switching circuit, while the 120VAC value belongs only to the coil control circuit.

A key advantage of the Sensata Gigavac GX21KC is its sealed hermetic construction. The sealed contact chamber helps protect the internal contact system from dust, humidity, oxidation, and contamination. This makes the GX21KC 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.

The K coil code indicates a 120VAC coil version. This is different from common DC coil versions such as 12VDC, 24VDC, and 48VDC. The GX21KC should be selected only when the control system is designed to operate a 120VAC coil. Before replacing a DC coil contactor with this model, confirm the control voltage and wiring method carefully.

This model uses stud and wire lead termination with 122 cm / 48 in flying leads. The longer lead configuration is useful in battery cabinets, power distribution boxes, EV control cabinets, and industrial assemblies where the coil circuit must be routed to a controller or harness connection point. Since GX21KC does not include an auxiliary contact, it is best suited for systems where separate contact feedback is not required.

Key Features

• Genuine Sensata Gigavac GX21 Series DC contactor
• 150A contact rating for DC power control
• 800VDC maximum switching voltage for high-voltage systems
• 120VAC coil for AC 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 122 cm / 48 in wire lead termination
• 30 ms operate time and 50 ms release time
• Suitable for EV, ESS, solar, marine, and industrial DC systems

Applications

The GX21KC DC contactor is suitable for systems that need reliable connection and disconnection of DC battery, load, or charging circuits while using a 120VAC control supply. 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 GX21KC 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 GX21KC

The Sensata Gigavac GX21KC is a practical option when the system requires 150A current capacity, up to 800VDC switching voltage, 120VAC coil operation, sealed construction, long wire leads, and no auxiliary contact. Compared with DC coil versions, this model is specifically suited for control systems that use an AC coil supply.

For replacement and maintenance projects, GX21KC should be selected when the original system requires GX21 Series performance with 150A contact rating, 800VDC maximum switching voltage, 120VAC 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 GX21KC?
A1: The full product name is Sensata Gigavac GX21KC DC Contactor.

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

Q3: What does 120VAC mean?
A3: 120VAC 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 GX21KC include an auxiliary contact?
A5: No. GX21KC does not include an auxiliary contact.

Q6: What is the difference between GX21KC and GX21CA?
A6: GX21KC uses a 120VAC coil, while GX21CA uses a 24VDC coil.