Hello. I have this relay and I´m not sure about its values



The only one I´m sure is the 24VDC (the coil voltage) and the 250V (Max contact voltage). But it also says 20A -- 14VDC, and 5A/15A -- 250V (AC)

What do these number mean?

Thank you

best regards

 

The ~ next to 250V means AC, hard to read it is so out of focus... DC ratings are typically lower than AC ratings due to arc extinguishing properties of DC. Really need to check the PDF.

 

Thanks for your answeri have look for the datasheet but I haven't find it.

The circuit is a thermostat what I'm going to use to cut the current in the primary of a microwave oven transformer when it reaches a certain temperature. The secondary of the MOT it is rewonded to give 30V. The primary shouldn't go over 8 or 9 amps at 220VAC

 

Typically, on the bottom line, there should be a model number and there isn't one in this case. Searching for a TCE 4181 Relay does not provide any links. There are lots of other 4181 relays that do have PDFs but each one is a bit different. What is a given, is that the coil is 24VDC, 20A may be the contacts rating @ 14VDC, @250VAC the contacts rating may be 5A continuous and 15A momentary. But without confirmation by a PDF specification, it is all speculation. But you are going at it a bit backwards. First draw the circuit and then specify the devices required. The circuit diagram/schematic determines what is required.

 

Thank you

 

Is it this one?
https://www.taxnele.com/Pcb-Relay.html
https://www.taxnele.com/product/T78-relay.html

 

Max Switching Voltage

250VAC/16VDC

Max Switching Power

1250VA/320W

That works out to 20A@16VDC and 5A@250VAC which is what I suspected. I do find it a bit odd that it's stamped 14V on the relay and the spec is given for 16V? There is no specification for the 15A marking either but I suspect that it is momentary VAC. And those are maximum AC and DC ratings but you will need 24VDC for the coil although it's drop out voltage is not given.

 

I have found those PCT style relays rarely have the copper foil traces heavy enough to support the rating, and usually where problems occur.
Not so much the continuous current that may be a problem, but the inrush.

 

I usually go for the smaller rectangular signal relays or the Square D octal is what I designed around for 120VAC motor control circuits (pre-PLC). Those relays have an odd pinout that won't fit the standard perfboard layout so I have avoided them. FWIW

 

I got the manufacturers page on the first hit.
Relay
.
.
.

 

Those are the HEYI relays, not the TCEs. There are several 4181 relays with slightly different specs. I found several manufacturers while searching but not the TCEs that @Ian0 found. As a side note, is there a socket available for them? The signal relays fit into the standard chip DIP socket and of course the Octals fit the standard octal tube sockets and have octal socket bases made just for wiring the relays with screw terminals.

 

For a limited production units I put together I used nothing but socket-plug-in relays.
Either Octal or square flat-pin style.

 

Thank hoy allí for tour help! Yes Ian0, os that one