SIEMENS 5ST3012 – Miniature Circuit Breaker | JUAL SIEMENS 5ST3012 – Miniature Circuit Breaker; auxiliary switch 2 NC for miniature circuit breakers 5SL, 5SY, 5SP, incorporated switch 5TL1, RCBO 5SU1 (without 5SU1…FP/FR), RCCB 5SV (for 5SU1, handle coupler 5ST3805-1 is required)