The Siemens 5SJ6420-7RC is a 4-pole miniature circuit breaker (MCB) from the Retail line, rated at 20 A with a C-trip characteristic and a 6 kA breaking capacity. The C-curve means it trips at 5 to 10 times rated current — standard for general-purpose distribution and moderate motor starting loads where short inrush won't nuisance-trip.
Lifecycle & Sourcing
For a BOM freeze or line-down spare, this part can be sourced to order. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm delivery commitment.
Integration Notes
Mounts on standard DIN rail in a distribution board or sub-panel. The 4-pole (4P) construction switches all three phases plus neutral, suitable for three-phase final subcircuits in commercial or light industrial installations. The 6 kA breaking capacity covers most building-service fault levels; verify the prospective short-circuit current at the point of installation.