The Siemens 5SU1354-7RC40 is a SENTRON RCBO (residual current circuit breaker with overcurrent protection) rated 40 A at 50 Hz AC, combining a C-curve MCB and a Type A RCD in a single 2-module (36 mm wide) package. The C characteristic means it trips between 5 and 10 times rated current — suited for inductive loads like small motors or lighting banks where inrush is moderate. The Type A residual current detection handles pulsating DC fault currents as well as sinusoidal AC, which covers most single-phase electronics and rectifier-fed loads found in commercial and light industrial panels.
Breaking capacity and coordination
Rated breaking capacity is 10 kA per EN 60898 and 15 kA per IEC 60947-2. The higher IEC figure applies when the RCBO is used as a circuit breaker in industrial distribution — the EN value governs residential or commercial final circuits. Overvoltage category III and pollution degree 2 confirm it is rated for fixed installation downstream of the main distribution board, not for plug-in portable use.
Mounting and panel fit
Occupies 2 modular width units (36 mm) on a DIN rail. Depth is 70 mm, height 90 mm. Mounting position is unrestricted — can be installed horizontally or vertically. Supply can enter from either top or bottom. The IP20 rating applies with the distribution board closed and conductors connected; the enclosure provides the environmental seal, not the device itself.
Environmental range
Operates from -40 °C to +75 °C ambient, with max 95% humidity. That covers unheated enclosures in cold climates and high-temp machine cabinets near ovens or drives.
Lifecycle and sourcing
Listed as current production (active lifecycle stage). The 5SU1354-7RC40 is a standard catalog item in the SENTRON range. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.