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Siemens 3RU1900-1A — Overload Relays

Siemens 3RU1900-1A SIRIUS Mechanical Reset, Phased Out

MPN3RU1900-1A

Siemens SIRIUS, mechanical RESET accessory, 3RU1900-1A, for 3RU11/3RB20/3RB21 overload relays sizes S00...S3, includes resetting plunger, holder and funnel.

Siemens 3RU1900-1A datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RU1900-1A — Identification
ParameterValue
Product brand nameSIRIUS
Product designationmechanical RESET
Frame size (overload relay)S00, S0, S2, S3
3RU1900-1A — Environmental
ParameterValue
Operating temperature-20 ... +70°C
Storage temperature-50 ... +80°C
3RU1900-1A — Other specifications
ParameterValue
Design of the productresetting plunger, holder and funnel

Product details

The Siemens 3RU1900-1A is a mechanical RESET accessory for the SIRIUS 3RU11 and 3RB20/3RB21 overload relay family. It includes a resetting plunger, holder, and funnel, and covers frame sizes S00, S0, S2, and S3. This part is a phased-out product. The official Siemens successor is the SIRIUS 3RU2 series, with preferred replacement order codes 3RU2900-1A or 3RB3980-1A.

The 3RU1900-1A is marked as a phased-out product. For new builds or BOM revisions, the direct drop-in replacement path is the 3RU2900-1A.

Environmental ratings

These cover most panel environments, including unheated warehouses.

Frequently asked questions

What is the closest functional replacement for 3RU1900-1A?

The official Siemens replacement is the 3RU2900-1A (or 3RB3980-1A). These are the preferred successor types for the phased-out 3RU1900-1A.

What overload relays does the 3RU1900-1A fit?

It fits the SIRIUS 3RU11 and 3RB20/3RB21 overload relays in frame sizes S00, S0, S2, and S3.

What are the temperature limits for storage and operation?

Storage temperature range is -50 to +80 °C; operating temperature range is -20 to +70 °C.

MPN
3RU1900-1A