NEW Old Stock
Ex our production stores, our audio production business has now closed down (retired) and all the stock must find new owners
Never heard of or used a polyswitch?
Think of them like a fuse but they "mend" themselves when the fault condition is removed (after a period time) so the need to replace a "blown" fuse is removed.
Not the fastest of devices, quite slow when reacting to over currents and once the over current condition is removed, very slow to "repair themselves"
Often used in electronics where the location of components (e.g power supply) within the equipment being protected would make it difficult to extract and replace a fuse and also commonly in high power audio loudspeaker systems, particularly tweeter protection - the polyswitch protects the tweeter and if is "driven" too hard (too much current through the tweeter) the polyswitch goes high resistance, protecting the tweeter and allowing the rest of the loudspeaker system to operate as normal albeit without the high frequencies! At least you still have sound .... after a while, the polyswitch goes low resistance again and the tweeter comes back "on line"
TYCO - Polyswitch
Part # RXEF135
Maximums:
72V
40A
Trip current (20°C) 2.7A
Hold current (20°C) 1.35A
Here is an extract from the datasheet to give more technical details
The full datasheet (with mechanical drawings) is readily available online
DIMENSIONS:
13mm diameter x 1.75mm thick
Axial tinned copper wire leads (12mm length x 0.7mm diameter)
COSMETIC CONDITION:
NEW Old Stock
NO body damage
Leads are clean and shiny
Always stored in the original suppliers packaging
This is not an ongoing supply, once my workshop spares are gone .... there will be no more
If the photograph shows multiple polyswitches, I am offering in the advertisement ONE POLYSWITCH not all of them for this price!
