Ref 4TM Overload 1/8HP

Description

4TM Refrigerator Compressor Thermal Overload Protector (1/8 HP) ### Product Overview The 4TM Thermal Overload Protector is a critical safety device designed to protect small fractional horsepower refrigerator and freezer compressors (specifically rated at 1/8 HP) from catastrophic overheating and electrical burnout. Operating via an internal, temperature-sensitive bimetallic disc paired with a series-connected heater wire, the 4TM monitors both the current flowing into the compressor and its surface temperature. If the compressor stalls, draws excessive current, or gets dangerously hot, the bimetallic disc instantly snaps open, cutting off power. Once the compressor cools down to a safe level, the disc automatically resets, restoring power to resume normal cooling cycles. ### Key Features Dual Protection Circuitry: Simultaneously senses over-current conditions (like a locked rotor or start failure) and ambient case temperature to offer comprehensive protection. Compact Plug-on Design: Features a low-profile, standard shape that snaps directly onto the top terminal pin of the compressor, fitting neatly under the protective terminal cover. Premium Bimetal Component: Engineered for highly consistent trip times and a high-cycle lifespan, preventing the internal contacts from welding shut. Standard Male Spade Terminal: Equipped with a standard 1/4″ quick-connect terminal on the back for easy wiring to the power line and start relay. ### Product Compatibility & Cross-Referencing To ensure compatibility, look for a match in compressor horsepower (1/8 HP), operating voltage (typically 110V/120V or 220V/240V), and the matching 4TM alphanumeric code printed on the casing. Direct Replaces & Equivalent Configurations: Sensata / Texas Instruments Klixon: Original 4TM series (e.g., matching common codes like 4TM165RFBYY, 4TM189NFBYY depending on voltage). Universal Part Numbers: Commonly replaces generic round or rectangular overload switches marked for 1/8 HP or ~93 Watts. Common Industry Equivalents: Often used alongside standard 1-pin or 3-pin PTC start relays in standard low-back-pressure (LBP) refrigeration circuits. Compatible Appliance Types: Single-door household refrigerators and small compact mini-fridges. Compact under-counter beverage centers and office water coolers. Small commercial display cases and small chest freezers. Common Compatible Compressor & Appliance Brands: Because it serves as a standardized universal protection module, it is compatible with compressors used by major appliance manufacturers worldwide, including: Embraco / Secop / Danfoss (Commonly found on smaller EM, PW, and TL series compressors) Whirlpool / Kenmore / Maytag Frigidaire / Electrolux LG / Samsung Panasonic / Haier / Midea ⚠️ Installation Note: Ensure the overload protector is pressed completely and firmly onto the compressor pin. A loose connection will create localized electrical resistance, causing the protector to get artificially hot and trip continuously even if the compressor is completely fine. Always ensure your refrigerator is unplugged before attempting the repair.