It's not a current sensor. It's almost certainly a contactor.
https://na.industrial.panasonic.com...panasonic_aev_ev_new_product_introduction.pdf
It's probably a special part for Nissan. There is some speculation as to it's specs here
Hm, alright. Thanks! I have another that I will probably just use, then.The current sensor is made by Nippon Ceramic, but might be a custom model for Nissan.
Maybe the data sheets for their other standard sensors can help:
http://www.nicera.co.jp/pro/is/is-03e.html