How to find the connector for your LEM sensor (and others)

The Hass series of current sensors, and many other similar products, have a connector output but do not state exactly how to mate to it. As a consumer, that can be very frustrating. So here’s a walkthrough that may be helpful in the future.

As always, the first place to check is the datasheet.

Once the datasheet is opened, CTRL + F is your best friend. I recommend searching for the term “connect” as this should pull up any instances of “Connector” or “Connection”


And just like that we have a hit.
Of course this method only works if the datasheet allows searching within it, and they have the connection label as above. If that is not the case, you may have to spend more time reading through the datasheet. Typically the connection information is listed in or around the physical dimensions of the product.

Now back to our example.
The datasheet specifies Molex 5045-04A
Searching that within our system pulls up some curious results. 16 connector options that don’t seem to match the information in the datasheet. It appears the datasheet is giving more general information than a specific part number, but we can work with that.
By selecting 4 position and specifying the 5045 series, we are left with two options. One gold and one tin. Based off the photograph of the Hass sensors, the connection appears to be tin, but both options will have the same mating connectors so either should do. For the sake of simplicity, we will select the tin option: WM18787-ND / 0022041041

Luckily, WM18787-ND is an option in our system that already has the mate listed lower on the page: WM2022-ND / 0022011042. If that is not the case, a dive into the datasheet or manufacturer site may be required.
It looks like WM2022-ND is just a housing, so you will likely need the associated contacts and crimp tools as well. Again, this information is listed on our site for many products, but addition research may be required for some.

And there you have it. A simplistic walkthrough on how to connect your sensors, using the Hass series as an example.