text.skipToContent text.skipToNavigation


Littelfuse Heat Pump Solutions

Intelligent technologies for convenient and energy efficient smart homes

Littelfuse supplies an innovative, curated selection of components for heat pumps. This meets stringent standards of the current market trends:

  • Global annual installations are expected to increase from 10M units in 2020 to 15M units in 2025, growing at an 8.5% CAGR
  • The residential market accounts for 81% of the volume due to installations in newly constructed homes
  • Inverter-driven motors are improving system efficiencies, allowing heat pumps to be used in a wider range of climates
  • The Net-Zero Emissions (NZE) initiative is driving over 80 countries to reduce greenhouse gas emissions by 50% by 2030 and to net-zero by 2050; heat pumps are a critical part of emission reduction strategy
  • To reach NZE targets, annual installations will need to increase from 15M to 85M units by 2030. Rebates and government initiatives will help close the gap; major growth of >15% expected between 2025 and 2030



505 Series

A 500VAC/VDC rated ceramic fuse with remarkable interrupting rating in a compact 6.3 x 32mm package, which is well suited for circuit protection in high energy applications.


  • In accordance with underwriter’s Laboratories Standard UL 248-14
  • Available in cartridge and axial lead form and with various lead forming dimensions
  • RoHS compliant and Lead-free
  • Superior Interrupting rating of 20,000 Amperes
  • Compact form factor of 6.3mm x 32mm


  • Uninterruptible Power Supplies (UPS)
  • 3-Phase Power Supplies



UltraMOV® Series

The UltraMOV® Metal Oxide Varistor Series is designed for applications requiring high peak surge current ratings and high energy absorption capability. UltraMOV® varistors are primarily intended for use in AC Line Voltage applications such as Surge Protection Device (SPD), Uninterruptable Power Supplies (UPS), AC Power Taps, AC Power Meters, or other products that require voltage clamping of high transient surge currents from sources such as lightning, inductive load switching, or capacitor bank switching.


  • Lead-free, Halogen-Free and RoHS compliant
  • High peak surge current rating (ITM) up to 10kA, single 8 x 20 pulse, (20mm)
  • Standard operating voltage range compatible with common AC line voltages (130 VAC to 625 VAC)
  • Characterized for maximum standby current (Leakage)


  • Custom voltage types available
  • Standard lead form and lead space options
  • High operating temperature range up to 125°C (phenolic coating option). 10mm, 14mm and 20mm devices are UL Recognized and TUV certified with 800V isolation voltage rating



HCC Series

The HCC Series definite purpose contactors consists of 1 pole, 2 pole, and 3 pole contactors from 30 amperes to 40 amperes. Acting as an on/off switch controlled by thermostats, contactors are designed with consistent silver thickness for increased product life, making them ideal for the demands of a broad range of applications. The 1 and 2 pole models are typically used in residential applications, while the 3 pole contactors are typically used in commercial applications.

Features & Benefits

Double E magnet assembly For optimal performance with reduced power use
Movable contacts with heavy duty silver alloy To help extend the life of the product
One piece terminal design meets NEMA standard Allowing spacing without insulated terminals
Termination options include combo screw, screw with pressure plate, or lug To meet a broad range of system needs
Universal mounting configuration Helps streamline installation
Optional auxiliary switches available Designed for use with 3 pole contactors



  • HVAC/R
  • Food & Beverage
  • Lighting
  • Welding
  • Water/Wastewater



Thermistor Probes & Assemblies

Littelfuse offers the USP10976 series Ring Lug probe assemblies which are suitable for a wide range of temperature sensing applications.


  • Tight Tolerance
  • #6 Mounting Hole


  • Teflon Insulated Lead Wire
  • 150°C Max Operating Temperature