Sensata Gigavac HXNC241CAB

The Sensata Gigavac HXNC241CAB is an HXNC241 Series normally closed high-voltage DC contactor designed for capacitor discharge, dump switch, and fail-closed HVDC circuit applications. This model is configured with a 200 A current rating, 1500VDC nominal switching voltage, a 24VDC 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 24VDC value refers to the coil/control circuit.

Product Description

The Sensata Gigavac HXNC241CAB is a normally closed DC power contactor for high-voltage systems that need a closed default state. Unlike standard normally open HX contactors, this model keeps the main contact closed when the coil is not energized. When the 24VDC coil is powered, the main contact opens. When coil power is removed, the main contact returns to the closed position.

This operating logic makes HXNC241CAB useful for capacitor discharge, dump switch, and fail-closed safety circuits. In a high-voltage inverter, energy storage system, or power conversion cabinet, a normally closed discharge path can be used to help remove stored energy when control power is lost or when the system is commanded into a safe state. The contactor provides the switching element, while the final discharge behavior depends on the resistor, fuse, wiring, thermal design, and system control logic.

The full model number should be used in product listings and backend records. “HXNC241” identifies the 200 A, 1500VDC normally closed contactor family. The first suffix letter “C” indicates the 24VDC coil version. The “A” 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 only.

Key Features

• Normally closed SPST-NC main contact for fail-closed HVDC circuits.
• 200 A current rating for high-voltage power switching applications.
• 1500VDC nominal switching voltage for demanding DC systems.
• 24VDC coil for common industrial, battery, and control architectures.
• 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 2.3 W coil power for efficient continuous operation.
• Designed for capacitor discharge and dump switch applications.

Applications

The Sensata Gigavac HXNC241CAB is commonly used in HVDC systems that require a normally closed power path. Typical applications include capacitor discharge circuits, inverter DC link discharge, battery energy storage safety circuits, photovoltaic and wind power equipment, power conversion cabinets, high-voltage test equipment, DC dump circuits, and industrial safety discharge systems.

Because the main contact is normally closed, this contactor is selected when the default unpowered state must connect the circuit rather than isolate it. For example, a system may energize the coil during normal operation to keep a discharge path open, then remove coil power to close the discharge path and bleed stored energy through a designed resistor network. This is different from using a standard normally open main contactor as a battery disconnect.

Design Notes

The 1500VDC and 24VDC ratings describe different electrical paths. The 1500VDC value applies to the main contact/load circuit. The 24VDC value applies to the coil circuit that changes the contact state. A 24V controller output may open the normally closed contactor while the main terminals are part of a much higher voltage DC system, provided the circuit remains within the contactor’s specified ratings.

The HXNC241CAB includes a normally open auxiliary contact. This auxiliary contact can be used for contactor status feedback, interlock logic, or diagnostic confirmation. It is mechanically linked to the main contact system, but it is a signal contact and should not be used as a main power switching path.

For discharge applications, the contactor should be used with properly sized discharge resistors, insulation spacing, fuses, wiring, and thermal protection. Designers should verify peak current, discharge time constant, duty cycle, ambient temperature, and fault behavior. The contactor is the switching component; it does not by itself define the complete discharge energy or safe discharge time.

Why Choose Sensata Gigavac HXNC241CAB

HXNC241CAB is a strong choice when a high-voltage DC system needs a compact normally closed contactor with 24V control and auxiliary feedback. Its 1500VDC rating and 200 A current class make it suitable for HVDC discharge and dump switch circuits, while hermetic sealing helps protect the contact system from dust, moisture, and harsh environmental conditions.

For replacement or purchasing, write the full model as Sensata Gigavac HXNC241CAB. Do not shorten it to HXNC241 only, because suffix letters define coil voltage, lead length, and auxiliary contact configuration. Also do not list it as a standard HX normally open contactor; the HXNC prefix identifies a normally closed main contact.

FAQ

Is HXNC241CAB normally open or normally closed?
The main power contact is normally closed, SPST-NC, 1 Form Y. The auxiliary contact is normally open.

Is HXNC241CAB a 1500V or 24V contactor?
It uses both values for different circuits. The main contact is rated for 1500VDC switching, while the coil/control circuit is 24VDC.

What is HXNC241CAB 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 HXNC241CAB?
The final B indicates an SPST normally open auxiliary contact for feedback or control signaling.