Positive Temperature Coefficient, a.k.a. POSISTOR.
When current exceeds a preset threshold, the component heats up, increasing its resistance until it opens the circuit on which it’s fitted.
When it cools down, it begins to conduct again: a fuse that resets itself!
The current value at which this takes place has to be chosen in a standard scale and is decisive, as it will decide how to protect the connected loudspeakers.
PROTECTIONS
| TE Part Number | € | UL Rated Current (Amps) |
IH (Room Temperature) | Vmax Operating | IT (Room Temperature) (Amps) |
Rmin (Ohm) |
R1 Max [Post Trip] (Ohm) |
Rmax | Tripped Power Dissipation (Typical) (W) |
Lead Type |
| RXEF020 | 40 | 0.20 | 72V | 0.40 | 1.83 | 4.40 | 2.75 | 0.41 | Stand. Kinked Lead | |
| RXEF030 | 40 | 0.30 | 72V | 0.60 | 0.88 | 2.10 | 1.330 | 0.49 | Stand. Kinked Lead | |
| RXEF040 | 40 | 0.40 | 72V | 0.80 | 0.55 | 1.29 | 0.860 | 0.56 | Stand. Kinked Lead | |
| RXEF050 | 40 | 0.50 | 72V | 1.00 | 0.50 | 1.17 | 0.770 | 0.77 | Stand. Kinked Lead | |
| RXEF065 | 40 | 0.65 | 72V | 1.30 | 0.31 | 0.72 | 0.480 | 0.88 | Stand. Kinked Lead | |
| RXEF075 | 40 | 0.75 | 72V | 1.50 | 0.25 | 0.60 | 0.400 | 0.92 | Stand. Kinked Lead | |
| RXEF090 | 40 | 0.90 | 72V | 1.80 | 0.20 | 0.47 | 0.310 | 0.99 | Stand. Kinked Lead | |
| RXEF110 | 40 | 1.10 | 72V | 2.20 | 0.15 | 0.38 | 0.250 | 1.50 | Straight | |
| RXEF135 | 40 | 1.35 | 72V | 2.70 | 0.12 | 0.30 | 0.190 | 1.70 | Straight | |
| RXEF160 | 40 | 1.60 | 72V | 3.20 | 0.09 | 0.22 | 0.140 | 1.90 | Straight | |
| RXEF185 | 40 | 1.85 | 72V | 3.70 | 0.08 | 0.19 | 0.120 | 2.10 | Straight | |
| RXEF250 | 40 | 2.50 | 72V | 5.00 | 0.06 | 0.13 | 0.080 | 2.65 | Straight | |
| RXEF300 | 40 | 3.00 | 72V | 6.00 | 0.04 | 0.10 | 0.060 | 2.80 | Straight |
|
Veff (Volts) |
Rated Current (Amps) |
Cold Rcc (Ohm) |
€ |
| 36 | 1,5 | 1,35 |