Sensata Gigavac MX12FCB DC Contactor Overview

The Sensata Gigavac MX12FCB is a sealed hermetic DC contactor from the MX12 Series, designed for rugged low-voltage DC switching applications that require 200A current capacity and 48VDC maximum switching voltage. It uses a 48VDC control coil, chassis mounting, stud and wire lead termination, 122 cm / 48 in flying leads, and a normally open auxiliary contact. This model is suitable for military vehicles, heavy-duty equipment, battery disconnect systems, industrial DC power control, marine power systems, material handling equipment, and rugged low-voltage DC applications. In this model, 48VDC switching voltage refers to the main contact circuit, while 48VDC coil voltage refers to the control coil used to operate the contactor.

Product Description

The Sensata Gigavac MX12FCB DC contactor is built for rugged low-voltage, high-current DC switching applications. As part of the MX12 Series, this model provides a 200A contact current rating and up to 48VDC switching voltage. It is commonly used in military vehicles, off-road equipment, battery disconnect systems, material handling platforms, marine electrical systems, industrial DC cabinets, and heavy-duty power control assemblies.

The MX12FCB uses an SPST-NO contact arrangement, also described as 1 Form A. The main contact remains open when the coil is not energized and closes when the 48VDC coil receives the correct control voltage. Although both the switching voltage and coil voltage are 48VDC in this model, they refer to two separate circuits. The switching voltage belongs to the main load path, while the coil voltage belongs only to the control circuit.

A key advantage of the Sensata Gigavac MX12FCB is its hermetically sealed construction. The sealed contact chamber helps protect the internal contact system from dust, moisture, oxidation, and contaminated environments. This is important for military vehicles, heavy-duty machinery, industrial battery systems, and outdoor DC power equipment where open-frame contactors may have reduced service life.

The MX12 Series is designed for demanding duty cycles and high inrush conditions. The datasheet lists 200A continuous current with 2 AWG conductor conditions, along with short-duration overload capability including 1200A for 1 second, 800A for 10 seconds, and 300A for 90 seconds. This makes the MX12FCB suitable for rugged DC power systems where startup surge, transient load current, or short overload events may occur.

The MX12FCB configuration includes 122 cm / 48 in flying leads and a normally open auxiliary contact. The longer lead length is useful for harness-based installation in larger cabinets or vehicle wiring layouts. The normally open auxiliary contact can provide status feedback to a controller, interlock circuit, or monitoring system.

Key Features

• Genuine Sensata Gigavac MX12 Series DC contactor
• 200A contact rating for low-voltage DC power control
• 48VDC maximum switching voltage for rugged battery systems
• 48VDC coil for control circuit operation
• SPST-NO contact form, also described as 1 Form A
• SPST normally open auxiliary contact for feedback or interlock use
• Hermetically sealed construction for harsh environments
• Stud and 122 cm / 48 in wire lead termination
• Silver contacts for long life and weld-resistant operation
• Designed for MIL and heavy-duty DC applications

Applications

The MX12FCB DC contactor is suitable for systems that need reliable connection and disconnection of high-current, low-voltage DC circuits. Typical applications include military vehicles, electric utility vehicles, off-road machinery, battery disconnect units, forklifts, marine battery systems, emergency power equipment, industrial control cabinets, and heavy-duty DC distribution systems.

In a battery system, the Sensata Gigavac MX12FCB can be used as a main contactor, load disconnect contactor, charge path contactor, or safety isolation device depending on the circuit design. Its 200A current rating makes it suitable for medium-to-high current low-voltage platforms, while the 48VDC switching rating makes it better matched to rugged low-voltage DC systems rather than high-voltage EV traction platforms.

Why Choose Sensata Gigavac MX12FCB

The Sensata Gigavac MX12FCB is a strong option when the system requires 200A current capacity, 48VDC switching, 48VDC coil operation, sealed construction, chassis mounting, long wire leads, and a normally open auxiliary contact. Compared with ordinary open contactors, the hermetic seal helps improve reliability in vibration, moisture, and contamination-prone environments.

For replacement and maintenance projects, MX12FCB should be selected when the original design requires MX12 Series performance with 200A contact rating, 48VDC maximum switching voltage, 48VDC coil voltage, SPST-NO contact form, 122 cm / 48 in flying leads, and normally open auxiliary contact. Before ordering, confirm coil voltage, load current, switching voltage, mounting space, terminal type, and auxiliary contact requirement.

FAQ

Q1: What is the full product name of MX12FCB?
A1: The full product name is Sensata Gigavac MX12FCB DC Contactor.

Q2: What is the main switching voltage?
A2: The main switching voltage is up to 48VDC maximum.

Q3: Why are both switching voltage and coil voltage 48VDC?
A3: They refer to different circuits. One is the main contact switching voltage, and the other is the coil control voltage.

Q4: What is the current rating?
A4: The contact rating current is 200A.

Q5: Does MX12FCB include an auxiliary contact?
A5: Yes. MX12FCB includes a normally open auxiliary contact.

Q6: Where is MX12FCB commonly used?
A6: It is commonly used in military vehicles, heavy-duty equipment, battery disconnect systems, marine DC systems, and industrial low-voltage DC power control.