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Siemens 3RH1911-1FA40-ZW95 — Contactors

Siemens 3RH1911-1FA40-ZW95 Auxiliary Switch Block, 4 NO, 10

MPN3RH1911-1FA40-ZW95

Siemens SIRIUS auxiliary switch block, 3RH1911-1FA40-ZW95, 4 NO contacts, 10 A rated, screw terminals, snap-on mounting, IP20 front protection.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RH1911-1FA40-ZW95 — 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-ZW95 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1911-1FA40-ZW95 — Connection & Mounting
ParameterValue
Mounting methodsnap-on mounting
3RH1911-1FA40-ZW95 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1911-1FA40-ZW95 — Mechanical
ParameterValue
Width36.5 mm
Height37.5 mm
Depth41.5 mm

Product details

It snaps onto the contactor via the standard mounting interface — no tools needed for installation, but verify the latch is fully engaged before energizing. The screw-type terminals on this block accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) conductors with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG for auxiliary wiring. That matters when the auxiliary contact feeds a PLC input or a safety relay: you want it to close every time, not just most times.

Snap-on mounting onto the contactor. The block measures 36.5 mm wide, 37.5 mm high, and 41.5 mm deep. IP20 on the front protects against finger contact.

Contact ratings across voltages

The maximum continuous current is 10 A, but the switching capacity varies significantly with voltage. At 24 V DC the block is rated for 6 A, dropping to 0.3 A at 220 V DC. For AC loads at 230 V it handles 6 A, and at 400 V it is rated for 3 A. At AC-15 duty (inductive loads typical for contactor coils and solenoid valves) at 690 V it is rated for 1 A. Always verify the switching current at your specific operating voltage — the 10 A maximum is only achievable at low voltages.

Frequently asked questions

What replaces 3RH1911-1FA40-ZW95?

The official successor is the SIRIUS 3RH2 series. The 3RH2140-1BP40 is a direct functional replacement with the same 4 NO contact configuration and similar ratings, but in a larger S00-size housing with screw and snap-on mounting onto 35 mm DIN rail. It is physically larger (73 mm deep, 45 mm wide) so it will not drop into the same panel footprint without rewiring and re-spacing.

Where can I buy 3RH1911-1FA40-ZW95?

This phased-out part is sourced through independent distribution channels. Submit an RFQ for current availability and pricing — stock is intermittent and confirmed at quote time.

Will 3RH1911-1FA40-ZW95 drop into a panel designed for 3RH2140-1BP40?

No. The 3RH1911-1FA40-ZW95 is a smaller block (36.5 mm wide, 41.5 mm deep) that snaps directly onto SIRIUS contactors. The 3RH2140-1BP40 is physically larger (45 mm wide, 73 mm deep) and mounts onto 35 mm DIN rail. They are not footprint-compatible without panel rework.

What is the contact reliability of this auxiliary switch block?

Rated at one faulty switching per 100 million operations at 17 V, 1 mA. This is a very high reliability rating for low-energy signal circuits.

MPN
3RH1911-1FA40-ZW95