Square D Qwikline - QO Mk1 - 15a Type 4 Single Pole MCB Used
From the Qwikline range. Compatible with all Qwikline boards along with QO-E, QO-X and QOE breakers. Not compatible with Loadcentre KQ, Qwikline II SQO type circuit breakers or the Domae range. 'Stab-lok Connection' Plug On device.