The Siemens 5SL5216-7CC is a SENTRON miniature circuit breaker — 2-pole, C-curve, rated 16 A with a 10 kA DC breaking capacity at 72 V DC.
DC rating and the so-what
This breaker is specced for DC only — 72 V DC maximum, 10 kA. That's not a typo; it's not rated for AC at all. If your line runs a 48 V DC control bus or a 60 V DC power supply bank, this is the right MCB. The 2-pole design (2P) means both poles switch simultaneously, so you get full isolation on both the positive and return sides. That's a requirement in many DC systems to avoid a floating ground fault.
The IP20 rating (with conductors connected) is typical for enclosed panel gear — no washdown rating, so keep it inside the cabinet. Sealable, halogen-free, silicon-free — matters if you're in a food plant or a clean room where outgassing is a concern.