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Siemens 3RH2122-4LV80-0LA0 — Contactors

Siemens 3RH2122-4LV80-0LA0 SIRIUS Contactor Relay, Railway,

MPN3RH2122-4LV80-0LA0

Siemens SIRIUS contactor relay for railway applications, 3RH2122-4LV80-0LA0, Size S00, 2 NO instantaneous contacts, varistor surge suppression, screw and snap-on 35 mm DIN rail mounting.

Siemens 3RH2122-4LV80-0LA0 datasheet (PDF)
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

3RH2122-4LV80-0LA0 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-4LV80-0LA0 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V10 A
Rated value @ 24 V10 A
Rated value @ 60 V4.7 A
Rated value @ 110 V3 A
Rated value @ 220 V1.2 A
3RH2122-4LV80-0LA0 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-4LV80-0LA0 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-4LV80-0LA0 — Connection & Mounting
ParameterValue
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail
Side-by-side mountingYes
3RH2122-4LV80-0LA0 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-4LV80-0LA0 — Environmental
ParameterValue
Operating temperature range-40 ... +70 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-4LV80-0LA0 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm

Product details

Railway-rated contactor relay, Size S00

The Siemens SIRIUS 3RH2122-4LV80-0LA0 is a contactor relay explicitly designated for railway applications, carrying the SIRIUS brand and built in Size S00. It provides 2 normally open instantaneous contacts and integrates a varistor as the built-in surge suppressor.

Switching ratings across DC and AC voltages

This relay is rated for switching at multiple voltage levels. At 24 V rated value it handles 10 A, at 60 V rated value 4.7 A, at 110 V rated value 3 A, at 220 V rated value 1.2 A, at 230 V rated value 10 A, at 400 V rated value 3 A, at 440 V rated value 0.5 A, at 500 V rated value 2 A, at 600 V rated value 0.26 A, and at 690 V rated value 1 A.

Frequently asked questions

What is the closest functional second-source for 3RH2122-4LV80-0LA0?

The closest functional peer is the standard SIRIUS contactor relay 3RH2122-1BW40. The key difference is that the -4LV80-0LA0 variant carries the railway designation and includes a built-in varistor surge suppressor, whereas the -1BW40 is a general-purpose variant without the railway-specific rating and typically without the varistor. Both share the Size S00 footprint and 2 NO contact configuration, so panel fit is identical, but the -1BW40 lacks the 6 kV surge voltage resistance and the railway environmental qualification.

Will 3RH2122-4LV80-0LA0 drop into a panel specified around 3RH2122-1BW40 without rewiring?

Yes, both parts share the same Size S00 footprint, 45 mm width, 73 mm depth, 70 mm height, and 35 mm DIN rail snap-on mounting. Terminal layout for the 2 NO contacts is identical. No rewiring is needed for the power contacts, though the varistor on the -4LV80-0LA0 may require verifying coil polarity if the original circuit assumed a different suppression method.

What compliance documentation does this part provide?

The part carries a substance prohibition date of 10/01/2009, confirming RoHS compliance from that date. The railway designation implies compliance with relevant railway standards (EN 50155 family), though specific certification marks (UL, CSA, IEC) are not listed in the available specification data.

Where can I buy 3RH2122-4LV80-0LA0?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time. Submit an RFQ for a firm price and lead time.

MPN
3RH2122-4LV80-0LA0