Skip to main content
Siemens 3RH1911-1FA40 — Contactors

Siemens 3RH1911-1FA40 Auxiliary Switch Block, 4 NO, 10 A

MPN3RH1911-1FA40

Siemens SIRIUS auxiliary switch block, 3RH1911-1FA40, 4 NO contacts, screw terminals, snap-on mounting for size S00 contactors, 10 A rated, IP20.

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

Specifications

3RH1911-1FA40 — Ratings & Performance
ParameterValue
Rated value @ 24 V10 A
Rated value @ 60 V4.7 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH1911-1FA40 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1911-1FA40 — Connection & Mounting
ParameterValue
Mounting methodsnap-on mounting
3RH1911-1FA40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1911-1FA40 — Mechanical
ParameterValue
Width36.5 mm
Height37.5 mm
Depth41.5 mm

Product details

Contact ratings and switching reliability

The contact ratings vary by voltage and duty: 10 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, and 3 A at 400 V. For DC-13 duty, the ratings are 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 0.26 A at 600 V. The block is rated for 10 million mechanical switching cycles, and the contact reliability is specified as 1 faulty switching per 100 million operations at 17 V and 1 mA.

Snap-on mounting directly onto the contactor relay or power contactor of size S00. No DIN rail required for the block itself — it clips onto the front of the base device. Dimensions are 36.5 mm wide, 37.5 mm high, and 41.5 mm deep.

Frequently asked questions

What replaces the 3RH1911-1FA40?

The Siemens SIRIUS 3RH2911-1FA40 is the preferred successor type.

What are the key ratings for this auxiliary switch block?

It provides 4 NO contacts rated for a maximum of 10 A, with an insulation voltage of 690 V at pollution degree 3 and a surge voltage resistance of 6 kV.

How is this auxiliary switch block mounted?

It snaps onto size S00 contactor relays and power contactors. No separate DIN rail mounting is needed for the block itself.

MPN
3RH1911-1FA40