Xiamen SET Electronics Co., Ltd.

SETsafe | SETfuseThermally 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)  in a ceramic case with silicone cement. It is not only able to proceed over temp. protection by ATCO itself but also proceed over current protection by RXF transferring heat to ATCO to open the circuit.

RXF

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.

— (SETsafe | SETfuse Standards)

ATCO

Alloy Thermal-Link

Alloy Type Thermal-Link, alloy is the thermal element. Thermal-Link is A non-resettable device incorporating a THERMAL ELEMENT which will open a circuit once only when exposed for a sufficient length of time to a temp. in excess of that for which it has been designed.

R

Rated Resistance

Resistance value for which the resistor has been designed, and which is generally used for denomination of the resistor.

— (IEC 60115-1)

P₀

Actual Power 

The Max. power of TRXF can be used within the allowable operating Temp. range.

— (SETsafe | SETfuse Standards)                                             

U_N

Rated Voltage

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.   

— (IEC 60115-1)

T_f

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.

— (IEC 60691)

Tolerance: T_f °C (GB/T 9816, EN 60691, K60691).

Tolerance: T_f ± 7 °C (J60691).

Fusing Temp.

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.

Through Hole

Radial

● LED Drivers

● Electric Blanket

● Industrial Equipment

SETsafe | SETfuse Quality Policy

Provide Industry-Leading Products

Raw-materials Supplier

Select critical raw materials: Must be from a manufacturer with quality management system (ISO9001, IATF16949) certification.

Annual or Quarterly Audits.

IQC (Incoming Quality Check)

AQL(MIL-STD-105E), Dimensions, Function, Visual Inspection, RoHS & REACH Test.

Document

Formulate corresponding incoming inspection specifications (01-QA-06-xxx) for each key material according to design data such as material technical indicators.

Testing Equipment and Tools

Projector, Resistance meter, Tool Microscope, Salt Spray Tester, Universal Material Testing Machine, Spectrum Analyzer, etc.

Manufacturing Process

Online Inspection and Testing (Function 100% Automatic Testing).

Document

Process Flow Chart.

Failure Mode and Effects Analysis (FMEA).

Quality Control Flow Chart (QCFC).

Standard Inspection Procedure (SIP).

Work Instruction (WI).

Online Testing and Inspection

Resistance test system (100% Automatic Testing).

100% Visual Inspection.

etc.

IPQC (In Process Quality Control) Inspection

AQL(MIL-STD-105E), Dimensions Inspection, Function Test, Visual Inspection.

FQC ( Final Quality Control)

AQL(MIL-STD-105E), Dimensions Inspection, Function Test, Visual Inspection, RoHS & REACH Test.

Reliability Test

T Test specification (01-TE-01-3003-001)

Including 26 items of Appearance Requirements, Electrical Performance, Mechanical Performance, Soldering Performance, Environmental Test and Life Test. e.g.

Insulation Resistance Test.

Temperature Cycle Test.

Functioning Temperature Test.

Surge Test.

etc.

OQC (Outgoing Quality Control)

AQL(MIL-STD-105E), Packaging, Labeling, Quantity Inspection.

Agency

Agency (Safety Certificate) Annual, Quarterly Audits.

Management System

ISO9001, (TUV approved and issued certificate).

ISO14001, ISO45001, etc.

Click to view the certificate

Environmental

RoHS & REACH Compliant.

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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).

Replacement

As TPR is a non-resettable product, for safety sake, please use the same type of TPR for replacement.

Usage

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.

Storage

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 of the pins, please use them up within 1 year after receiving the goods.

Recommended Hand-Soldering Parameters

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SET

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