Protections

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

 

PTC

PTC

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
RXEF030 0,36 40 0.30 72V 0.60 0.88 2.10 1.330 0.49 Stand. Kinked Lead
RXEF040 0,37 40 0.40 72V 0.80 0.55 1.29 0.860 0.56 Stand. Kinked Lead
RXEF050 0,38 40 0.50 72V 1.00 0.50 1.17 0.770 0.77 Stand. Kinked Lead
RXEF065 0,39 40 0.65 72V 1.30 0.31 0.72 0.480 0.88 Stand. Kinked Lead
RXEF075 0,40 40 0.75 72V 1.50 0.25 0.60 0.400 0.92 Stand. Kinked Lead
RXEF090 0,42 40 0.90 72V 1.80 0.20 0.47 0.310 0.99 Stand. Kinked Lead
RXEF110 0,44 40 1.10 72V 2.20 0.15 0.38 0.250 1.50 Straight
RXEF135 0,47 40 1.35 72V 2.70 0.12 0.30 0.190 1.70 Straight
RXEF160 0,49 40 1.60 72V 3.20 0.09 0.22 0.140 1.90 Straight
RXEF185 0,51 40 1.85 72V 3.70 0.08 0.19 0.120 2.10 Straight
RXEF250 0,53 40 2.50 72V 5.00 0.06 0.13 0.080 2.65 Straight
RXEF300 0,55 40 3.00 72V 6.00 0.04 0.10 0.060 2.80 Straight 

 

HALOGEN BULB

 

HALOGEN BULB

Veff

(Volts)

 Rated Current

(Amps)

 Cold Rcc

(Ohm)

36 1,5 1,35 2,00

 

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