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Siemens 3RU5900-1A — Overload Relays

Siemens 3RU5900-1A SIRIUS mechanical reset, S00–S12

MPN3RU5900-1A

Siemens SIRIUS mechanical reset, 3RU5900-1A, resetting plunger with holder and funnel, sizes S00 through S12 for 3RU51 overload relays.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RU5900-1A — Identification
ParameterValue
Product brand nameSIRIUS
Product designationmechanical RESET
Frame size (overload relay)S00, S0, S2, S3
3RU5900-1A — Environmental
ParameterValue
Operating temperature-20 ... +70°C
Storage temperature-50 ... +80°C
3RU5900-1A — Other specifications
ParameterValue
Design of the productresetting plunger, holder and funnel

Product details

The Siemens 3RU5900-1A is a SIRIUS-branded mechanical reset accessory for 3RU51 overload relays. It provides a manual resetting plunger with holder and funnel, sized to fit across the S00, S0, S2, and S3 frame sizes — meaning one part number covers the panel integration for multiple relay footprints.

Environmental limits

Rated for storage from -50 to +80°C and operation from -20 to +70°C. The wide storage range covers cold warehouses and hot shipping containers; the operating range suits most indoor panel environments without special derating.

Frequently asked questions

What is the storage temperature range for 3RU5900-1A?

The storage temperature range is -50 to +80°C.

Where can I buy 3RU5900-1A?

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

MPN
3RU5900-1A