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Siemens 5SM9446-0 — Residual Current Breakers (RCCB/RCBO)

Siemens 5SM9446-0 SENTRON RC Unit, 4P, 63 A, 100 mA, 400 V A

MPN5SM9446-0

Siemens SENTRON 5SM9446-0, RC unit electronic for 5SL4, 4-pole, type AC, 63 A, 100 mA, Un AC 400 V, 6 kA, 3 MW, IP20.

Siemens 5SM9446-0 datasheet (PDF)
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026

Specifications

Electrical Ratings

5SM9446-0 — Electrical Ratings
ParameterValue
Number of poles4
Overvoltage categoryIII

Identification

5SM9446-0 — Identification
ParameterValue
Product designationRC unit electronic for 5SL4
Product design / constructionInstantaneous

Mechanical

5SM9446-0 — Mechanical
ParameterValue
Mounting positionany
Width in modular units3
Maximum55 °C
Minimum-25 °C
Width54 mm
Height100 mm
Depth70 mm
Installation depth70 mm

Environmental

5SM9446-0 — Environmental
ParameterValue
IP degree of protectionIP20, if the distribution board is installed, with connected conductors

Product details

What it is and what it does

The Siemens 5SM9446-0 is a SENTRON residual current (RC) unit, type AC, designed as a companion module for the 5SL4 miniature circuit breaker. It provides earth leakage protection on 4-pole circuits up to 63 A rated current, with a 100 mA trip sensitivity and a rated voltage of 400 V AC. Breaking capacity is 6 kA per both EN 60898 and IEC 61008-1. It is an instantaneous device — no intentional short-time delay — so it clears ground faults within the standard response time for personnel protection.

Mounting and integration

Mounts via standard rail (DIN) and occupies 3 modular width units (54 mm). Installation depth is 70 mm. The supply connects at the top, above the 5SL4 MCB. Rated for overvoltage category III, and IP20 with connected conductors in an installed distribution board. Ambient range is -25 °C to +55 °C; storage range extends to -40 °C.

Frequently asked questions

What is the 5SM9446-0 used for?

It is a residual current unit (type AC) that mates with the 5SL4 miniature circuit breaker to provide combined overcurrent and earth leakage protection on 4-pole circuits up to 63 A, 400 V AC, with 100 mA sensitivity.

What are the key ratings of 5SM9446-0?

Rated current 63 A, sensitivity 100 mA, rated voltage 400 V AC, breaking capacity 6 kA per EN 60898 and IEC 61008-1, 4 poles, type AC, instantaneous.

Where can I buy 5SM9446-0?

This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quoting.

MPN
5SM9446-0