The Siemens 5SU1656-7KV13 is a combined residual-current device and miniature circuit breaker (RCBO) in a single 1+N-pole module. It integrates Type A earth-leakage detection at 300 mA with a C-curve overcurrent trip rated 13 A, breaking capacity 6 kA. The 70 mm depth fits standard Siemens distribution boards alongside other 1+N RCBOs.
What the ratings mean for fit
Type A detection means it responds to sinusoidal AC residual currents and pulsating DC residual currents — the standard requirement for circuits supplying single-phase electronics, switched-mode power supplies, and appliances with rectifiers. The 300 mA IΔn is a fire-protection threshold, not a personnel-protection threshold (30 mA is typical for shock protection); this unit is sized for circuits where nuisance tripping from leakage on longer cable runs or equipment with filters would be unacceptable. The C-curve characteristic (magnetic trip at 5–10× In) handles inrush from motorized loads, pumps, and compressors without nuisance tripping, while the 13 A thermal element protects the downstream wiring. The 6 kA breaking capacity (IEC 60898-1) covers domestic and light commercial installations with prospective fault current up to that level.
Lifecycle and sourcing reality
For BOM-line commitment, the key fit criteria are the Type A + 300 mA + C-curve 13 A combination. If your panel design calls for a 1+N RCBO with those exact parameters, this order code is the direct Siemens match. Availability and current pricing are confirmed at quote time against an RFQ.