Amperite 115C** Time Delay Relay

[Thor61]

Has anyone ever used a Amperite 115C** Time Delay Relay tube for turn-on delay/soft start type applications ? If so what are the "pro's and/or con's to using them ?

[Thor61]

This is the correct part # Amperite 115NO120, C is for closed sorry for the mix-up !

[battradio]

Yes , but use in wirh a second latching relay so the themal relay is not on all the time .

[mesherm]

Here is a thread on Amperite TDRs.
http://www.diytube.com/phpBB2/viewtopic.php?t=3653&highlight=amperite

[dcriner]

It would be simpler to use a thermistor-type current limiter, such as a CL-90. Wire in series with the 120-V line - maybe a buck or so.

[Thor61]

Just wondering if the thermistor's performance can degrade over time rendering it less effective, If so would there be any advantage to using a larger one, say a 120 ?

[dcriner]

I'm unaware of thermistors "degrading over time." They are widely used for temperature measurement in many critical processes.

If you use a thermistor as an inrush current limiter, and select a higher current rating than necessary, it will take longer to heat up (OK), and have a higher steady-state voltage drop (maybe not OK). Best to examine the data sheets of the devices you are comparing.