Thermal Sensors OHD Thermal Guard Overview Applications The OHD Thermal Guard is developed for thermal problem Typical applications include atmospheric temperature countermeasures and safety standard conformity, which detection and overheating monitoring of power transistors, are becoming increasingly important for electronic devices power modules, room heaters, hot gas heaters, PPCs, in recent years. amplifiers, motors, HDDs, FDDs and other general appliances. Its unique proprietary design features a magnet and a temperature-sensing soft ferromagnetic substance called Thermorite . The materials magnetic flux density decreases as the temperature increases turning it into a paramagnetic substance at the Curie temperature. Benefits High reliability for on/off operations Compact, light and easy to handle High-speed response Dust, explosion and corrosion-proof Long operational life Wide range of operating temperatures available in 5C Excellent environmental durability increments from +30C to +130C Compatibility with extremely low (0.1 mW or lower) UL, CSA and TV approved signals to high power (6 W) levels RoHS/REACH compliant Extremely simple circuit design OHD1 OHD3 OHD5R Built Into Tomorrow KEMET Electronics Corporation KEMET Tower One East Broward Boulevard SE0202 OHD 11/2/2021 1 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.comThermal Sensors OHD Thermal Guard Ordering Information OHD 1- 50 B Maximum Operating Temperature Contact Series Opening/Closing (C) Type Power (W) OHD 1 = 6W 30 = 30C 65 = 65C 100 = 100C B = Break 3 = 6W 35 = 35C 70 = 70C 105 = 105C M = Make 5R = 1W 40 = 40C 75 = 75C 110 = 110C (OHD1 and 45 = 45C 80 = 80C 115 = 115C OHD3 only) 50 = 50C 85 = 85C 120 = 120C 55 = 55C 90 = 90C 125 = 125C 60 = 60C 95 = 95C 130 = 130C Structures and Principles of Operation TM Thermal Reed Switches (TRS ) are temperature-sensing switches composed of a magnet and a temperature- TM sensing soft ferromagnetic substance called Thermorite . This material s saturation magnetic ux density decreases as the temperature increases, and it turns into a paramagnetic substance at the Curie temperature. Structures and Principles of Operation Thermal Guard (OHD) are temperature-sensing switches composed of a magnet and a temperature-sensing soft ferromagnetic substance called Thermorite. This materials saturation magnetic flux density decreases as the temperature Temperature sensing ferrite Thermorite increases, and it turns into a paramagnetic substance at its Curie temperature. Our self-developed Themorite is temperature sensing ferrite utilizing Curie-temperature, where ferrites lose its magnetic property. Thermorite changes its magnetic property rapidly at Curie-temperature. Thermorite properties Features of Thermorite as temperature sensing material. Thermorite changes its magnetic property rapidly at its Curie temperature, providing quick response times. (1) Curie-temperature do not vary as time advances, because it depends on compounding ratio. The Curie temperature of Thermorite does not vary with time, as it is based on a compounding ratio. (2) Arbitrary shape available as ceramics. Thermorite is stable against moisture and hazardous gas. (3) Stable against moist or hazardous gas. Thermal property of Thermorite Permeability - temperature Saturation magnetic ux density temperature 1kHz-0.01Oe 6000 3500 TC30 TC60 TC90 3000 5000 TC120 2500 4000 2000 3000 TC150 TC90 TC150 1500 TC60 2000 1000 TC30 TC120 1000 500 0 0 0 20 40 60 80 100 120 140 160 0 20 40 60 80 100 120 140 160 Temperature Temperature TC=Curie temperature Encasing Glass tube Structure of reed switch Reed switch is contact switch comprised of a pair of Fe-Ni alloy reeds encased in glass tube with inactive gas. The reeds are switched on or off Inactive gas Contact Fe-Ni alloy reed by magnetic field of permanent magnet or magnet coil. Long lifetime, High environmental resistance because of protected contact by glass encasing. N S Reeds in glass tube become magnetized with SS NN NN magnetic field, and then two reeds contact and KEMET Electronics Corporation KEMET Tower One East Broward Boulevard SE0202 OHD 11/2/2021 2 SS connect each other (switch on). And then magnetic Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.com field disappears, the reeds separate and disconnect (switch off). NEC TOKIN Sensors Vol.145 All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data. Please request for a specification sheet for detailed product data prior to the purchase. Before using the product in this catalog, please readPrecaution and other safety precautions listed in the printed version catalog. 2015.3.310000SENVOL14E1503H1 Permeability Saturation magnetic ux density