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Siemens 3RF3125-1AA45 — Solid State Relays

Siemens 3RF3125-1AA45 SIRIUS 3RF31 solid-state relay, 25 A,

MPN3RF3125-1AA45
Active

Siemens SIRIUS 3RF31 solid-state relay, 1-pole, 22.5 mm, 25 A, 48-600 V load / 4-30 V DC control, screw terminal, 1200 V blocking voltage.

Siemens 3RF3125-1AA45 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RF3125-1AA45 — Specifications
ParameterValue
Group codeR711
Product group3725
Product classA: Standard product which is a stock item could be returned within the returns guidelines/period.
SeriesSIRIUS 3RF31 solid-state relays, 1-pole, 22.5 mm
Export control regulationsAL : N / ECCN : N
Compliance with the substance restrictions according to RoHS directiveSince: 15-01-24

Product details

The Siemens 3RF3125-1AA45 is a SIRIUS 3RF31 solid-state relay, single-pole, in the 22.5 mm housing. It switches 25 A across a 48-600 V AC/DC load circuit, controlled by a 4-30 V DC input, with a 1200 V blocking voltage rating. That blocking voltage means it holds off transients on the line side without breaking down — relevant when switching inductive loads or motor starters where back-EMF spikes are common.

Screw terminals for both load and control wiring — strip, torque, and go. No heatsink calculation needed for the 25 A rating at 25 °C ambient, but derate above 40 °C per the thermal curve in the documentation. The 1-pole configuration handles single-phase loads; for three-phase, stack three units or step up to the 3-pole 3RF34 variant.

Frequently asked questions

What is the closest alternative to 3RF3125-1AA45 in the SIRIUS 3RF31 family?

The 3RF3125-1AA45 is the 25 A, 48-600 V, 4-30 V DC control variant in the 1-pole 22.5 mm width. The closest sibling is the 3RF3125-1AB45, which swaps the screw terminal for a ring-lug connection — same electrical ratings, different termination. If you need a different control voltage, the 3RF3125-1AA46 uses 24-230 V AC/DC control instead of 4-30 V DC.

What are the group code and product group for 3RF3125-1AA45?

Group Code R711, Product Group 3725.

What compliance documentation does this relay carry?

RoHS compliant since 15-01-24. REACH Article 33 disclosure: Lead (CAS 7439-92-1) above 0.1% w/w. Export control classification AL:N / ECCN:N. No UL or CSA listing is stated in the available documentation.

MPN
3RF3125-1AA45