The Siemens SENTRON 5SV3642-6KL is a 4-pole residual current circuit breaker (RCCB) rated for 25 A at 230/400 V AC, 50 Hz. The instantaneous design (no short-time delay) means it clears ground faults immediately, which is the right choice for circuits where selective coordination with downstream RCDs is not required.
Ratings that matter for fit
The 1 kA surge current resistance (8/20 µs wave) means it withstands lightning-induced surges without nuisance tripping, which is important for outdoor-fed circuits. At 65 °C it drops to 23.3 A, and at 70 °C to 17.6 A. If the panel runs hot, factor that in. The I²t value of 58 000 A²·s and let-through current of 5 200 A define the energy-limiting performance for coordinating with upstream overcurrent devices.
Depth is 70 mm, height 90 mm. Mounting position is any — no restriction on orientation. Supply can enter from top or bottom. The N-pole is on the left (N left variation). Silicon-free construction, which matters for potting or conformal-coating processes in sensitive environments.