RXF21-TE power-type full-short-circuit temperature fuse resistors

Product Features

• Good lightning - surge resistance (1KV - 4KV), free from the risks of circuit - board burning and shell fusing.

• Cut off and protect the circuit in case of line abnormalities, with over - temperature protection function.

• Low fusing current (1.5 - 2 times the rated current), and low surface heat during fusing.

Application Scope

• Applied in various high - power switching power supplies, lightning protection modules, home appliances, smart home control boards, lighting, power strips, and all kinds of protection circuits.

Dimensions

Resistance - related Parameters

Half - short - circuit Characteristics

• Meets the primary - side half - short - circuit test standards of Huawei: Simulate a resistance of 100Ω (high - power external connection) in parallel between the high - voltage circuit and the primary side. Set the input voltage to make the current flowing through the fuse resistor (wire) the rated current, and start the power - on aging. Observe the changes of the outer shell until no new abnormal phenomena occur. Then, increase the voltage by 2V each time for point - by - point testing to confirm the situation of the outer shell until the fuse resistor (wire) fuses within 1S, and the charger should not have the phenomenon of melting through the shell.

• Meets the primary - side half - short - circuit test standards of customers such as Xiaomi, ZTE, Lenovo, and FiberHome.

Key Technical Indicators

1. Impact Resistance Characteristics

   

• As shown in the figure: Close the air switch K. Disconnect K2, and turn K1 on and off repeatedly 10,000 times. The resistor does not open - circuit.

2. Short - circuit Explosion - proof Characteristics

• Connect the resistor directly to the AC90V - AC264V power supply. The resistor fails instantaneously without obvious sparks, blowing, and large sounds. (Explosion - proof resistors are applicable)

3. Lightning - surge Characteristics

• Connect the test resistor to the lightning - surge tester, place the resistor on a non - conductive plane 0.1m above the ground reference surface, and apply voltage according to the requirements of IEC61000 - 4 - 5. Waveform: 1.2/50μs; Coupling method: direct output; Surge voltage is 1KV - 6KV; Polarity: positive and negative; Each surge interval: 60s; 5 times for each phase, a total of 40 times. At the end of the experiment, the test resistor should not be open - circuit.

Main Test Items, Methods, and Performance