Recoverable fuse works and is affected by temperature

The following is a circuit diagram of [the working principle of the recoverable fuse and the influence of temperature]

Recoverable fuse works and is affected by temperature

Communication equipment: program-controlled switch, user terminal equipment, total wiring security unit, etc. Automotive electronics: automotive wiring harnesses, car alarms, automotive micro-motors, automotive electronics, etc. Electronics industry: power ballasts, micro motors, fire alarms, instrumentation, etc. Electrical equipment: satellite receivers, security equipment, speakers, industrial automation, etc.

The RF/WHPTC self-resetting fuse has no polarity, low impedance and easy installation. It can be connected in series with the line of the protected appliance. The power supply can be DC or AC.

Description Ih Maximum operating current of RF/WHPTC components at ambient temperature of 25 °C It The minimum current that the RF/WHPTC component starts to protect at 25 ° C ambient temperature Imax RF/WHPTC components can withstand maximum current 1. List the average operating current (I) and the maximum operating voltage (V) on the equipment line.
2. List the normal values ​​and ranges of the working environment temperature, and calculate the normal current Ih according to the reduction rate (see the reduction rate table for ambient temperature and current values ​​for details).
Ih = average operating current (I) 折 reduction rate of ambient temperature and current value
3. Select a self-resetting fuse series according to L, V value, product category and installation method. (Refer to the specifications)
4. The I value of the selected self-resetting fuse must be less than or equal to Ih. The rated current is given under certain conditions. If it is required to work in a wide temperature range, there should be a certain margin. Generally, it can be taken. 1.5-2 times.
5, Vmax refers to the breakdown voltage, AC and DC can be used.
6. The protection action time is inversely proportional to the current, but at least twice the rated current, similar to a fuse tube.
7, because it is a semiconductor polymer device, so the number of switching will not be the end.
8, pay attention to it has a certain on-resistance, the higher the rated current, the smaller the resistance; the high-voltage type of resistance is larger. 85 °C RF/WH 600 138% 119% 100% 92% 83% 73% 64% 55% 42% RF/WH 250 132% 117% 100% 91% 85% 77% 68% 61% 48% RF/WH 90 136% 119% 100% 92% 81% 72% 63% 54% 40% RF/WH 60 136% 119% 100% 90% 81% 72% 63% 54% 40% RF/WH 30 130% 115% 100% 91% 83% 77% 68% 61% 52% RF/WH 16 132% 120% 100% 96% 88% 80% 71% 61% 47% RF/WH 6 130% 115% 100% 91% 83% 77% 68% 61% 52% (Editor: Circuit Diagram)