The Siemens 5SL6614-7CC is a 3+N-pole miniature circuit breaker rated at 400V with a 6kA breaking capacity, C-trip curve, and 0.3A current rating. It's a current-production Basic Devices series unit, so it's still a standard catalog line item — not a phase-out or NRND part.
That's a standard residential and light-commercial SCCR for European-style distribution boards; it's not rated for industrial high-fault locations where you'd need a 10kA or 25kA device. At 0.3A this is an unusually low current rating for a 3+N MCB. It's sized for protecting a control transformer secondary, a small signal supply, or a lightly loaded sub-feed where standard 1A or 2A breakers would be oversized. The 3+N-pole configuration (three protected phases plus switched neutral) is common in TN-S or TN-C-S systems where the neutral needs disconnection.
Deployment context
The 3+N form factor takes four module widths. For a panel builder: verify the busbar system matches the 3+N pitch — some 4-pole busbars are 3P+N with neutral on the right, which this breaker expects.
Marked as current production (active lifecycle stage). RoHS compliant since June 2013.
Sourcing reality
This is a standard catalog MCB, not a specialty or legacy item.