Need some help with ID of this one please

Thread Starter

Mr Determined

Joined Jul 8, 2019
Hi Everyone
I hate to ask,but I need to pick your brains,again. I have this little lovely white rectangular 2 pin component on a solar inverter board in position SW1. As usual,Dr Google was of no assistance. Any help in identifying this lovely piece of hardware would be greatly appreciated so I can test it to rule it in or out of my issue. Thank you all.

mystery resized.jpg