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Siemens 5SU9404-1KK20 — Residual Current Breakers (RCCB/RCBO)

Siemens 5SU9404-1KK20 SENTRON RCBO, 20 A, 100 mA, C-curve

MPN5SU9404-1KK20

Siemens SENTRON 5SU9404-1KK20, RCD-operated circuit breaker (RCBO), 2-pole, 20 A rated, 100 mA residual, C-curve, 10 kA breaking capacity, 1 MW.

Siemens 5SU9404-1KK20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

5SU9404-1KK20 — Electrical Ratings
ParameterValue
Number of poles2
Overvoltage categoryIII
5SU9404-1KK20 — Identification
ParameterValue
Product designationRCD-operated circuit breaker
Product design / constructionInstantaneous
5SU9404-1KK20 — Mechanical
ParameterValue
Mounting positionany
Width in modular units1
Maximum75 °C
Minimum-40 °C
Width18 mm
Height125 mm
Depth77 mm
Installation depth70 mm
5SU9404-1KK20 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors
5SU9404-1KK20 — Electrical
ParameterValue
Tripping Characteristic ClassC

Product details

The residual current element trips at 100 mA, Type AC, meaning it detects sinusoidal AC earth faults — the common domestic and light industrial waveform. The 20 A rating is the nominal current at 30 °C ambient. At elevated panel temperatures the unit derates: 18.8 A at 40 °C, 18.2 A at 45 °C, 17.4 A at 50 °C, and 16.2 A at 55 °C. For a BOM line feeding a 16 A continuous load in a 50 °C enclosure, this still holds margin; a 20 A load at that temperature would nuisance-trip.

Width is 18 mm (1 MW), depth 77 mm, height 125 mm. Installation depth is 70 mm. Mounts in any position on standard DIN rail. Touch protection is built in.

Frequently asked questions

Where can I buy 5SU9404-1KK20 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What is the closest functional second-source to 5SU9404-1KK20?

The 5SY6020-7 is a 2-pole 20 A C-curve MCB only — it lacks the integrated residual current protection. The 5SU9404-1KK20 is an RCBO combining MCB and RCD in one module. For a direct RCBO replacement, a different order code with the same 20 A / 100 mA / C-curve / 10 kA specification would be needed; the 5SY6020-7 alone does not cover the residual current function.

Will 5SU9404-1KK20 drop into a panel specified around 5SY6020-7 without rewiring?

Mechanically yes — both are 18 mm wide, DIN-rail mounted, supply from top or bottom. Electrically no: the 5SU9404-1KK20 adds a residual current module (100 mA Type AC) that requires the neutral conductor to pass through the unit, so the wiring differs from a plain MCB installation.

MPN
5SU9404-1KK20