Sensata Gigavac HX21CAC DC Contactor Overview

The Sensata Gigavac HX21CAC is a sealed hermetic DC contactor from the HX21 Series, designed for 350A current switching in high-voltage systems up to 1500VDC. It uses a 24VDC control coil, chassis mounting, stud and wire lead termination, and a normally closed auxiliary contact. This model is suitable for EV battery systems, battery energy storage equipment, solar and wind power systems, inverter systems, industrial DC power cabinets, marine power control, and high-voltage battery disconnect modules. In this model, 1500VDC refers to the main contact switching voltage, while 24VDC refers to the coil voltage used to operate the contactor.

Product Description

The Sensata Gigavac HX21CAC DC contactor is designed for reliable high-voltage DC switching in demanding battery and power conversion systems. As part of the HX21 Series, this model combines a 350A contact current rating with 1500VDC nominal switching capability, making it suitable for electric vehicles, battery energy storage systems, photovoltaic systems, inverter systems, industrial power distribution, and high-voltage battery disconnect circuits.

The HX21CAC 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 24VDC coil receives the correct control voltage. This allows a low-voltage control circuit to manage a high-voltage DC load path. The 1500VDC value belongs to the main switching circuit, while the 24VDC value belongs only to the coil control circuit.

A key feature of the Sensata Gigavac HX21CAC is its normally closed auxiliary contact. The auxiliary contact can provide contactor status feedback to a battery management system, safety controller, or system monitoring circuit. Compared with HX21CAX, which has no auxiliary contact, the HX21CAC is better suited for systems that need feedback or interlock logic. Compared with HX21CAB, which uses a normally open auxiliary contact, the HX21CAC provides normally closed auxiliary logic.

The HX21 Series uses hermetically sealed construction for harsh operating environments. The sealed design helps protect the internal contact system from dust, humidity, oxidation, and contamination. Sensata describes the HX21 platform as suitable for switching 1000+VDC systems and for applications such as solar, photovoltaic, inverter systems, battery packs, combiner boxes, and DC arc fault interrupter systems.

Key Features

• Genuine Sensata Gigavac HX21 Series DC contactor
• 350A contact rating for high-current DC power control
• 1500VDC nominal switching voltage for high-voltage systems
• 24VDC coil for control circuit operation
• SPST-NO main contact form for normally open switching
• SPST normally closed auxiliary contact for feedback or interlock use
• Hermetically sealed construction for harsh environments
• Stud and wire lead termination for secure installation
• Wide operating temperature range from -55°C to 85°C
• Suitable for EV, ESS, solar, inverter, and industrial DC systems

Applications

The HX21CAC DC contactor is suitable for high-voltage systems that need dependable connection and disconnection of battery, load, inverter, or charging circuits. Typical applications include EV battery packs, battery energy storage systems, photovoltaic combiner boxes, wind power systems, DC charging equipment, inverter power stages, UPS battery systems, marine electric propulsion, and industrial DC distribution cabinets.

In a battery system, the Sensata Gigavac HX21CAC can be used as a main positive contactor, main negative contactor, charge path contactor, load disconnect contactor, or safety isolation device depending on the system design. Its 350A current rating and 1500VDC switching voltage make it suitable for high-voltage platforms where sealed construction, auxiliary feedback, and stable switching performance are required.

Why Choose Sensata Gigavac HX21CAC

The Sensata Gigavac HX21CAC is a strong option when the system requires 350A current capacity, 1500VDC switching voltage, 24VDC coil operation, chassis mounting, wire lead termination, and a normally closed auxiliary contact. Compared with lower-voltage contactors, this model is better matched to high-voltage battery and renewable energy systems. Compared with contactors without auxiliary feedback, the HX21CAC gives the control system an additional status signal.

For replacement and maintenance projects, HX21CAC should be selected when the original system requires HX21 Series performance with 350A contact rating, 1500VDC switching voltage, 24VDC coil voltage, stud and wire lead termination, and SPST normally closed auxiliary contact. Before ordering, confirm coil voltage, auxiliary contact logic, mounting direction, termination style, current rating, and system voltage.

FAQ

Q1: What is the full product name of HX21CAC?
A1: The full product name is Sensata Gigavac HX21CAC DC Contactor.

Q2: What is the main switching voltage?
A2: The main switching voltage is 1500VDC nominal.

Q3: What does 24VDC mean?
A3: 24VDC 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 350A.

Q5: Does HX21CAC include an auxiliary contact?
A5: Yes. HX21CAC includes an SPST normally closed auxiliary contact.

Q6: What is the difference between HX21CAC and HX21CAB?
A6: HX21CAC has a normally closed auxiliary contact, while HX21CAB has a normally open auxiliary contact.