Siemens 5SL6404-7RC — 4A 4-Pole C-Curve MCB for Panel Protection
The Siemens 5SL6404-7RC is a SENTRON miniature circuit breaker rated 4 A at 415 V AC, 4-pole, with a C tripping characteristic and a breaking capacity of 7.5 kA.
The 4 A rating at 30 °C is the continuous current it carries without tripping; derate for higher ambient temperatures (the spec table shows ratings at 40, 45, 50, 55 °C on the single-pole sibling, and this 4-pole unit follows a similar thermal curve).
At 4 MW (72 mm wide), it takes up four 18 mm slots — plan your enclosure fill accordingly. Mounting position is unrestricted, which helps in tight enclosures where vertical or horizontal rail orientation is forced.