ClimateMaster 15B0021N02 Transformer 318172-701 the Littelfuse FLSR015 follows standard

the Littelfuse FLSR015 follows standard Class RK5 dimensions and is a direct cross-reference for the Bussmann FRS-R-15 and Mersen TRS15R

making it suitable for modern high-pressure systems like R410A and subcritical CO2 (R744)

When replacing an older or restricted metering device

When conducting Bard furnace maintenance

ClimateMaster 15B0021N02 Transformer 318172-701 the Littelfuse FLSR015 follows standardThe ClimateMaster 15B0021N02 is a heavy duty 50VA HVAC transformer designed for reliable voltage step down in residential and commercial geothermal heat pump systems. Engineered to convert 208 240V primary input to a stable 24V secondary output, this component provides the essential low voltage power required for control boards, contactors, and thermostats. As a direct OEM replacement for various Tranquility and Genesis series units, the 15B0021N02