A rather dummy question, what does the voltage rating of a terminal block/header stand for?
For example, this phoenix terminal block specifies a voltage rating of 400V; this Molex header specifies a voltage rating of 500V.
Are these voltage ratings for AC or DC voltage? I suppose this rating means the difference in potential between different positions on a same block?
I'm looking into building an amp for electrostatic headphones, where the rail voltages are +-450V, which means a 900V differential in DC voltage, so I can't really use these terminals to transmit rail supplies etc is that right?
Thanks!
For example, this phoenix terminal block specifies a voltage rating of 400V; this Molex header specifies a voltage rating of 500V.
Are these voltage ratings for AC or DC voltage? I suppose this rating means the difference in potential between different positions on a same block?
I'm looking into building an amp for electrostatic headphones, where the rail voltages are +-450V, which means a 900V differential in DC voltage, so I can't really use these terminals to transmit rail supplies etc is that right?
Thanks!
The rating is DC voltage. As long as you are not using adjacent terminals you would be within a 500 volt rated part.
These are common symbols, taken off the net.
Sometimes they are used when there is little space for language descriptors on the component.
You're right!
You might want to use shrink tube as an extra isolation layer (Class II) on the wires.
You might want to use shrink tube as an extra isolation layer (Class II) on the wires.
Thanks for the suggestion! now that you mentioned wires, reminded me that the wire insolation has a voltage rating too 😵
I forgot if mine are at 300V or 600V, I suppose this rating is specified for any conductor having a voltage difference that is being placed right next to the wire? Following that logic in theory it be fine if I tie the +450V and -450V wire together as long as they are rated at 600V, since there are 2 layers of insolation in between that right?
I forgot if mine are at 300V or 600V, I suppose this rating is specified for any conductor having a voltage difference that is being placed right next to the wire? Following that logic in theory it be fine if I tie the +450V and -450V wire together as long as they are rated at 600V, since there are 2 layers of insolation in between that right?
ok so the PCB I got have the output pads for the power supply output spacing 5.08mm away from each other. I filtered thru mouser and Digikey and no terminal block and headers with 5.08mm pitch has voltage rating above 450V, with the phoenix terminal blocks rated at 400V being the closest.
What's puzzling me are those molex headers, their voltage rating decreases with higher pitch distance... KK254 (2.54mm ptich) has voltage rating of 500V and KK396 (3.96mm pitch) has voltage rating of 250V, same as their 5.08mm pitched headers. this seems counterintuitive to me..
I'm thinking of doing a silly thing like getting the KK254 headers with twice the positions I need and clip out every other pin.. but a second thought if this will work so should their 5.08mm pitched headers quite have voltage rating to begin with - what am I missing here?
What's puzzling me are those molex headers, their voltage rating decreases with higher pitch distance... KK254 (2.54mm ptich) has voltage rating of 500V and KK396 (3.96mm pitch) has voltage rating of 250V, same as their 5.08mm pitched headers. this seems counterintuitive to me..
I'm thinking of doing a silly thing like getting the KK254 headers with twice the positions I need and clip out every other pin.. but a second thought if this will work so should their 5.08mm pitched headers quite have voltage rating to begin with - what am I missing here?
Have you looked at the TE dynamic series, such as D3200, with 5.08mm spacing? These are rated at 600V. These have locating pins and are larger than the Phoenix screw-down terminals, so probably won't fit an existing PCB, even if you removed the pins (which I'm not sure how advisable that is). Something like this: https://www.mouser.com/ProductDetail/571-11781283
Also, their Mini Universal Mate-N-Lok series is 4.14mm spacing, and is also rated at 600V: https://www.mouser.com/ProductDetail/TE-Connectivity-AMP/1-770170-1?qs=tyoXB4pMwRMK327Pr5AywQ==
Also, their Mini Universal Mate-N-Lok series is 4.14mm spacing, and is also rated at 600V: https://www.mouser.com/ProductDetail/TE-Connectivity-AMP/1-770170-1?qs=tyoXB4pMwRMK327Pr5AywQ==
Pars, thanks for the recommendations!
Yes I went thru the list and ignored these bc doesn't look like they will fit on the board, I got the those board set out of a partial kit.
I just thought of maybe a better option, I can probably make a small board for connections in between PSU board and amp boards, and put KK254 connectors on it, while on the amp/PSU board side I just solder wires with the other end goes into the KK254 wire housing - the 4455 housing series with soldering terminals has the rating of 500V, other ones with crimping and insertion only go up to 250V, oh well. 😵 But this should overall still make the connection between boards to be easily detachable for debug.
Yes I went thru the list and ignored these bc doesn't look like they will fit on the board, I got the those board set out of a partial kit.
I just thought of maybe a better option, I can probably make a small board for connections in between PSU board and amp boards, and put KK254 connectors on it, while on the amp/PSU board side I just solder wires with the other end goes into the KK254 wire housing - the 4455 housing series with soldering terminals has the rating of 500V, other ones with crimping and insertion only go up to 250V, oh well. 😵 But this should overall still make the connection between boards to be easily detachable for debug.
