Littelfuse PTC Heater Module, ...
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Littelfuse PTC Heater Module, 12V/24V Battery-Powered, -40°C to +130°C Rated

Littelfuse PTC Heater Module, 12V/24V Battery-Powered, -40°C to +130°C Rated

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Model: HEATER

In Stock (leaves warehouse same day if ordered before 3pm ET)

$1.00
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Littelfuse PTC Heater Module, 12V/24V Battery-Powered, -40°C to +130°C Rated

The Littelfuse Heater Module is a PTC (positive temperature coefficient) heater engineered for 12V or 24V battery-powered systems that need reliable heat in cold environments. Built to operate across a wide -40°C to +130°C temperature range, the module switches on at 0°C and switches off at 5°C, delivering automatic, self-regulating thermal protection without the need for external control circuitry or a separate thermostat. Its PTC element construction provides inherent overheat resistance, since resistance rises with temperature to naturally limit current draw, making it a dependable choice for battery, sensor, and enclosure heating in demanding electrical applications where consistent low-temperature performance is critical.

Key Features

  • PTC Heater Element: Positive temperature coefficient design provides self-limiting, self-regulating heat output for consistent, predictable performance.
  • Automatic Switch-On: Activates at 0°C to begin heating as soon as temperatures approach freezing, helping prevent cold-related equipment faults.
  • Automatic Switch-Off: Deactivates at 5°C to prevent unnecessary energy draw once the target temperature is reached, conserving battery capacity.
  • Battery-Powered Supply: Compatible with 12V or 24V battery systems for flexible integration into vehicle, marine, telecom, or industrial power architectures.
  • Wide Operating Range: Rated for continuous operation from -40°C to +130°C, supporting dependable performance across extreme hot and cold conditions.
  • Heater Module Series: Part of the Littelfuse Heater Module family, designed for straightforward integration into new and retrofit battery heating circuits.
  • No External Thermostat Required: Built-in switching thresholds mean the module regulates its own on/off cycle without additional temperature-control hardware.

Technical Specifications

  • Switch On (°C): 0
  • Heater Type: PTC
  • Switch Off (°C): 5

Typical Applications

  • Battery Enclosure and Compartment Heating
  • Cold-Climate Equipment Protection
  • Automotive and Marine Electrical Systems
  • Industrial Panel and Cabinet Heating
  • Outdoor and Low-Temperature Installations
  • Telecom and Remote Enclosure Heating

Why Littelfuse?

Littelfuse engineers circuit protection and thermal management components trusted across automotive, industrial, and battery-powered electrical systems. The Heater Module's PTC construction and defined 0°C to 5°C switching thresholds give installers a predictable, self-regulating way to keep batteries and enclosures within a safe operating window across a -40°C to +130°C range, supporting reliable, code-compliant performance in demanding professional electrical work.

Product Specs

Product Type:
PTC Heater Module
Voltage Rating:
12V/24V
Department:
Electrical
Product Group:
Wiring Devices

Littelfuse HEATER – Frequently Asked Questions

1) Will the Littelfuse PTC heater module work on a 24V battery bank, or is it 12V only?
It runs on either. The Littelfuse Heater Module is rated 12V/24V, so the same part drops into a 12V vehicle or marine system or a 24V telecom, solar, or industrial battery bank without a separate version.
2) Does the Littelfuse heater module need a thermostat or controller wired in?
No. The switching thresholds are built into the module: it turns on at 0 C and off at 5 C, so it cycles itself with no external thermostat or control circuitry in the loop. You wire it to the battery supply and it manages its own duty cycle.
3) Can this heater overheat if it stays powered in a hot enclosure?
The element is PTC (positive temperature coefficient), so its resistance climbs as it warms and current draw falls off on its own. That self-limiting behavior is inherent to the element, not a fuse or cutout, and the module itself is rated for continuous operation up to +130 C.
4) Is a PTC heater module the right choice for keeping a lead-acid or lithium battery box warm in winter?
That is one of its stated uses. A PTC element self-regulates instead of driving constant wattage the way a resistive pad does, and the 0 C on / 5 C off thresholds mean it only draws from the bank it is protecting when temperature actually approaches freezing. Typical applications for the Littelfuse module include battery enclosure and compartment heating, automotive and marine electrical systems, industrial panels and cabinets, and remote telecom enclosures.
5) At what temperature does the Littelfuse Heater Module start and stop heating?
Heating starts at 0 C and shuts off at 5 C. That narrow 5 degree band keeps a battery or enclosure just above freezing rather than holding it warm, which is what keeps the parasitic draw off the bank when the temperature is already fine.
6) How cold can a Littelfuse PTC heater module be installed in?
The module is rated from -40 C to +130 C, so it survives and operates in arctic-grade outdoor cabinets, unheated equipment bays, and remote telecom enclosures. -40 C is also -40 F, so the same number applies whichever scale your spec sheet uses.
7) Can this be added to an existing enclosure heating circuit, or is it new-install only?
Either. The Littelfuse Heater Module is built for straightforward integration into new and retrofit battery heating circuits, and because the on/off control is internal you are only adding a supply connection rather than a thermostat, relay, and sensor.
8) What is the part number for the Littelfuse heater module?
It is sold under Littelfuse MPN HEATER, a single model covering the 12V/24V PTC heater module. There is no separate voltage or temperature variant to pick between when ordering.
9) Where can I get the full technical data on the Littelfuse Heater Module?
Littelfuse publishes a spec sheet PDF for the Heater Module covering the electrical detail beyond the 12V/24V rating and the 0 C to 5 C switching thresholds. It is the document to hand a panel builder or engineer who needs to size the supply circuit.
How fast can I get the Littelfuse HEATER delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Littelfuse HEATER come with a warranty?
Absolutely. The Littelfuse HEATER is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Littelfuse HEATER?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Littelfuse HEATER from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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