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Siemens 3RB2906-2DG1 — Overload Relays

Siemens 3RB2906-2DG1 SIRIUS Current Measuring Module

MPN3RB2906-2DG1
NRND

Siemens SIRIUS 3RB2906-2DG1 current measuring module, adjustable 2.4...25 A, 690 V AC-3e max, straight-through transformers, stand-alone installation.

Siemens 3RB2906-2DG1 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RB2906-2DG1 — Identification
ParameterValue
Product brand nameSIRIUS
Product designationCurrent measuring module
3RB2906-2DG1 — Protection & Trip
ParameterValue
Overload current setting range2.4 ... 25 A
3RB2906-2DG1 — Electrical (main circuit)
ParameterValue
Rated operational current25 A
Rated value (AC-3e), max.690 V
Main current circuitstraight-through transformers
3RB2906-2DG1 — Connection & Mounting
ParameterValue
Mounting / fastening methodstand-alone installation
3RB2906-2DG1 — Other specifications
ParameterValue
Substance prohibitance05/28/2009
Operational current at AC-3e at 400 v rated value25 A

Product details

What this current measuring module does

The Siemens 3RB2906-2DG1 is a SIRIUS current measuring module designed for use with 3RB22/23/24 overload relays in size S00/S0. It mounts stand-alone and connects to the main circuit via straight-through transformers — no auxiliary circuit wiring needed. This covers most small-to-medium motor protection applications in a panel.

Lifecycle and sourcing — NRND status

This part carries a lifecycle status of NRND (Not Recommended for New Designs). It is still available for existing BOM positions and maintenance spares, but new projects should consider the current SIRIUS generation.

The module carries a substance prohibitance date of May 28, 2009, indicating RoHS compliance from that date forward. Standard Siemens documentation (datasheet, manual) is available for this SIRIUS series.

Frequently asked questions

What is the adjustable current range of 3RB2906-2DG1?

The adjustable current response value is 2.4...25 A, covering small motor protection and similar loads. At AC-3e duty at 400 V, the operational current is rated 25 A.

How does the 3RB2906-2DG1 mount in a panel?

It is designed for stand-alone installation — no DIN rail or panel cutout required beyond the mounting footprint. The main circuit connects via straight-through transformers, and there is no auxiliary circuit connection.

MPN
3RB2906-2DG1