Thermally Protected Resistor (TPR) is an unique type of Power Resistor, with Over Temp. and Over Current Protections. Thermally Protected Resistor (TPR) is a type of power resistor, where Alloy Thermal-Link (ATCO) and Fusible Wirewound Resistor (RXF) are in series encapsulated in a ceramic case with silicone cement.
SETsafe | SETfuse TPR has the same physical size as ordinary ceramic resistor while additionally providing fault current protection. TPR can also effectively protect against the damages to devices & equipment, caused by continuous heat dissipations by ceramic resistors due to fault currents.
● Power Supply
● Office Appliances
● Household Appliances
Fusible Wirewound Resistor
A power resistor which is made by winding a resistive element on a ceramic core, and the core is coated by insulation coating. It intends to interrupt a current flow at a predetermined time when the current exceeds a predetermined value. Fusible Wirewound Resistor is disposable fuse elements and is non-recoverable.
Alloy Type Thermal-Link, Alloy is the thermal element.
Rated Functioning Temp.
The temperature of the Alloy Thermal-Link which causes it to change the state of conductivity with a detection current up to 10 mA as the only load.
Tolerance: Tf °C (GB/T 9816, EN 60691, K60691).
Tolerance: Tf ± 7 °C (J60691).
The temperature of the Alloy Thermal-Link which causes it to change its state of conductivity is measured with silicone oil bath in which the temperature is increased at the rate of 0.5 °C to 1 °C / minute, with a detection current up to 10 mA as the only load.
The d.c. or a.c. r.m.s. voltage calculated from the square root of the product of the rated resistance and the rated dissipation.
The Max. power of TRXF can be used within the allowable operating Temp. range.
Resistance value for which the resistor has been designed, and which is generally used for denomination of the resistor.
Cold Resistance Test
1. If product TCR is not less than 350 (10-6/°C), the measured resistance value shall be corrected as the relative resistance value under 25 °C according to TCR formula.
2. Resistance Measurement (4-terminal test).
As TPR is a non-resettable product, for safety sake, please use the same type of TPR for replacement.
1. Do not touch the resistor body or pins directly when power is on, to avoid burn or electric shock.
2. When air pressure is from 80 kPa to 106 kPa, the relative altitude shall be 2000 m to - 500 m.
1. Please store TPR with ambient temp. 10 °C to 30 °C and relative humidity 30% to 75%.
2. Do not store the TPR at the high temperature, high humidity or corrosive gas environment, avoid influencing the solderability ofthe pins, please use them up within 1 year after receiving the goods.
Recommended Hand-Soldering Parameters
Solder Iron Temp.:
(350 ± 5) °C
3 s Max. (115 °C ≤ Tf ≤ 150 °C)
5 s Max. (Tf > 150 °C)
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Thermally Protected Resistor (TPR) Catalog
SETsafe | SETfuse was established in 2000 in Xiamen, China. We have a presence in more than 40 countries recognising our products. Some of the world's 500 fortune companies are our valuable customers. We have pioneered, innovated & developed several products exclusively. Products are compliance with CCC, UL, cUL, VDE, TUV, PSE, KC, IATF16949, ISO9001, ISO14001, ISO45001, GB/T29490 certificates. We are in one of the core participating teams for revising and setting several national & international standards in the field of Circuit Protection.