© Siemens AG 2010 BETA Protecting Miniature Circuit Breakers (MCBs) Miniature circuit breakers, 5SP and 5SY Double terminal chambers enable 2 conductors of different cross-section to be accommodated (up to 10 mm 2 in the bot- tom chamber and 35 mm 2 in the top chamber). Adapted handle locking device for 5SY, 5SJ and 5SP minia- ture circuit breakers. Suitable for locks of 3 mm to 6 mm diam- eter. 19 19/5 Siemens LV 1 · 2010