3 phase plug won't fit securely in socket.

[Peterrr]

I have a 3 phase (male) NHP ISOP P5532P plug that fits into a (female) Clipsal 563 540 socket, but won't go in deep enough for the threaded collar to screw on. It only needs to go in another 2-3mm. Hints please?

 

[DefyG]

Probably the socket and plug housing are incompatible if from different manufacturers!

 

[PS Electrics]

I have a 3 phase (male) NHP ISOP P5532P plug that fits into a (female) Clipsal 563 540 socket, but won't go in deep enough for the threaded collar to screw on. It only needs to go in another 2-3mm. Hints please?

Searching shows these both comply to AS/NZS 3123 standard so in theory should be compatible.

Like Defyg said different manufacturers so could be slight tolerance differences.

Can you check the plug with another socket?

I assume you have checked for obvious things like bent pins and obstructions?

 

[Avo Mk8]

You have a 32A plug, but a 40A socket.
The part number for an NHP 40A plug is ISOP S540P, different from the part you quote
They might not be exactly the same?

Edit: I noticed the way the NHP plug is assembled with a click mechanism using a screwdriver slot is neat, but perhaps it hasn't engaged properly.

 

[andrewgrenee]

I have a 3 phase (male) NHP ISOP P5532P plug that fits into a (female) Clipsal 563 540 socket, but won't go in deep enough for the threaded collar to screw on. It only needs to go in another 2-3mm. Hints please?

It sounds like you're really close to a proper fit, but that 2–3mm can make all the difference with these types of industrial connectors.

Here are a few things to check:

1. Alignment: Double-check that the plug pins are properly aligned with the socket—not just rotationally, but also that there's no pin slightly off or bent. A minor misalignment can prevent full insertion.
2. Debris or burrs: Inspect both the plug and socket for any debris, dirt, or small plastic burrs that might be preventing a flush connection. Sometimes even factory moulding residue can cause an issue.
3. Gasket or seal: Some of these connectors have a rubber sealing ring inside the socket or on the plug. If it’s mis-seated or swollen, it can stop full insertion. Try applying a small amount of silicone-based lubricant (not petroleum-based) to help it seat properly.
4. Wear or compatibility: Even though the NHP ISOP P5532P and Clipsal 563 540 are generally compatible, there can be very slight variations in manufacturing tolerances. If the plug is new and the socket is older (or vice versa), this can sometimes be an issue. Try gently wiggling the plug (without forcing it) as you insert it to help guide it in.

If none of that helps, it might be worth comparing it side-by-side with a known compatible pair or contacting the manufacturers to confirm tolerance compatibility.

Let us know how you go!

 

[littlespark]

It was solved, @andrewgrenee Turns out he had a 32A plug and 40A socket.