RCD for panel builders: what the ratings mean
The Siemens 5SM2335-6 is a 3-pole SENTRON residual current device (RCD) designed for DIN-rail mounting in distribution boards. Its 30 mA trip threshold (Type A) covers sinusoidal AC and pulsating DC fault currents — the standard choice for mixed-load panels with electronics, VFDs, or single-phase rectifiers. The 63 A AC rated current at 50 Hz is the continuous load it carries; above 40 °C ambient, the derating curve applies: 58.6 A at 40 °C, stepping down to 50.4 A at 70 °C. Insulation voltage is rated 460 V, overvoltage category III, pollution degree 2 — so it sits comfortably in a main LV switchboard feeding downstream sub-distribution. Instantaneous tripping with no adjustable time delay (OFF-delay not adjustable) means it responds to the first fault cycle — suited for shock protection, not selective coordination. The surge current resistance is rated 1 kA, surge voltage resistance 4 kV, giving it a solid margin against switching transients common in motor control panels.
Mounting and integration
Occupies 3 modular width units (MW) on a DIN rail. Depth is 70 mm, width 107 mm, height 90 mm. Fastening method is REG (regular DIN-rail clip). Mounting position any — no restriction on orientation. Supply feed can enter from top or bottom. Rated IP20 only when the distribution board is installed and conductors are connected — this is an enclosed-panel component, not a standalone enclosure. Sealable? No. That means no provision for a lead-seal wire through the actuator — relevant if your site requires tamper-evident locking on the RCD handle.
Lifecycle and sourcing
Lifecycle stage is current — this is an active, in-production Siemens SENTRON catalog item. No end-of-life notice or last-time-buy window exists. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.