Sensata Gigavac HXNC241BAB

The Sensata Gigavac HXNC241BAB is an HXNC241 Series normally closed DC power contactor designed for high-voltage capacitor discharge, dump switch, and fail-closed circuit applications. This model is configured with a 200 A current rating, 1500VDC nominal switching voltage, a 12VDC coil, 15 inch flying leads, an SPST-NC main contact, and an SPST-NO auxiliary contact. The 1500VDC value refers to the main power/load circuit, while the 12VDC value refers to the coil/control circuit.

Product Description

The Sensata Gigavac HXNC241BAB is not a standard normally open main contactor. It is a normally closed high-voltage DC contactor designed for applications that need the main circuit closed when the coil is not energized. This makes it especially useful for capacitor discharge, dump switch, fail-safe discharge, and other control circuits where the default de-energized state must provide a closed current path.

In the de-energized state, the HXNC241BAB main contact is closed. When the 12VDC coil is energized, the main contact opens. When coil power is removed, the contactor returns to its normally closed state. This is the opposite behavior of most GV, GX, HX, and MX normally open contactors. For that reason, HXNC241BAB should be clearly described as a normally closed contactor in product titles, backend attributes, and customer-facing specifications.

The full part number is important. “HXNC241” identifies the 200 A, 1500VDC normally closed contactor family. The “B” coil code indicates the 12VDC coil version. The “A” termination code indicates 15 inch flying leads. The final “B” indicates an SPST normally open auxiliary contact. 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 and discharge circuits.
• 200 A current rating for high-voltage DC power applications.
• 1500VDC nominal switching voltage for HVDC systems.
• 12VDC coil for common battery and control electronics.
• 15 inch flying leads for coil and auxiliary wiring.
• Normally open auxiliary contact mechanically linked to the main contact system.
• Hermetically sealed construction for harsh operating environments.
• Built-in coil suppression for simplified control circuit design.
• Low 2.8 W coil power for efficient continuous operation.
• Designed for capacitor discharge and dump switch applications.

Applications

The Sensata Gigavac HXNC241BAB is commonly used in high-voltage DC systems where a normally closed power path is required. Typical applications include capacitor discharge circuits, inverter DC link discharge, energy storage safety circuits, battery pack dump circuits, photovoltaic and wind power systems, industrial HVDC equipment, high-voltage test systems, and power conversion equipment.

Because the contactor is normally closed, it can support designs where stored energy must be discharged when control power is removed. For example, a high-voltage capacitor bank may need a default discharge path for safety. In that type of system, energizing the HXNC241BAB coil opens the discharge path during normal operation, and removing coil power closes the contact again to discharge the stored energy through the designed circuit path.

Design Notes

The 1500VDC and 12VDC ratings describe different electrical circuits. The 1500VDC value applies to the main contact/load circuit. The 12VDC value applies to the control coil that changes the contact state. A 12V control output may open or release the contactor while the main terminals are part of a much higher voltage DC circuit, provided the complete system remains within the contactor’s rated limits.

HXNC241BAB includes a normally open auxiliary contact. This auxiliary contact can be used for status feedback, interlock logic, or diagnostic confirmation. It is mechanically linked to the main contact system but is not intended for power switching. The auxiliary contact should only be used within its signal-level rating.

For discharge applications, the contactor should be paired with properly sized resistors, fuses, wiring, insulation spacing, and thermal protection. The contactor provides the switching function, but the final discharge behavior depends on the complete circuit design. Designers should also verify the expected voltage, discharge current, time constant, duty cycle, ambient temperature, and fault conditions before selecting this model.

Why Choose Sensata Gigavac HXNC241BAB

HXNC241BAB is a strong choice when a high-voltage DC system needs a compact normally closed contactor instead of a conventional normally open device. Its 1500VDC rating and 200 A current class make it suitable for demanding HVDC discharge and dump switch designs, while the hermetic sealed construction helps protect the contact system from contamination and harsh environments.

For backend product listings, use the complete name Sensata Gigavac HXNC241BAB. Do not shorten it to HXNC241 only, because the suffix identifies the 12VDC coil, 15 inch flying leads, and normally open auxiliary contact. Also do not list it as a standard HX21 or HX24 normally open contactor, because the HXNC prefix indicates a normally closed main contact.

FAQ

Is HXNC241BAB normally open or normally closed?
The main power contact is normally closed, SPST-NC, 1 Form Y. The auxiliary contact is normally open.

Is HXNC241BAB a 1500V or 12V contactor?
It uses both values for different circuits. The main contact is rated for 1500VDC switching, while the coil/control circuit is 12VDC.

What is HXNC241BAB used for?
It is mainly used for capacitor discharge, dump switch, and fail-closed high-voltage DC applications.

What does the final B mean in HXNC241BAB?
The final B indicates an SPST normally open auxiliary contact for feedback or control signaling.