Device overview and key ratings
The Siemens 5SU1354-7KV32 is a combined residual-current device and miniature circuit breaker (FI/LS-protector) in a Type A configuration, rated IΔN 30 mA, breaking capacity 10 kA, 1+N-pole, with a C-trip curve at 32 A. The 30 mA trip threshold covers personnel protection (indirect contact) per IEC 60364, while the 10 kA short-circuit rating means it can safely interrupt faults up to that level without upstream fuse backup in most residential and light commercial panels. The Type A designation detects pulsating DC fault currents superimposed on AC — needed on circuits with single-phase rectifiers, switching power supplies, or modern electronics that produce smooth DC ripple.
Deployment context
The 1+N-pole format (switched phase plus switched neutral) fits standard DIN-rail enclosures — common in European-style consumer units and sub-distribution boards. The 70 mm depth (D=70 mm) is within the typical 85 mm enclosure depth, so no panel-depth conflict. The C-curve (32 A) is sized for motor-starting or transformer inrush loads, not purely resistive circuits; if the load is lighting or heaters, a B-curve would trip faster on small overloads.