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Siemens 3RH2122-2BB40-ZW96 — Contactors

Siemens 3RH2122-2BB40-ZW96 SIRIUS Auxiliary Contactor, 24 VD

MPN3RH2122-2BB40-ZW96
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Siemens SIRIUS 3RH2122-2BB40-ZW96, Size S00 auxiliary contactor, 24 VDC coil, 2 NO instantaneous contacts, screw and snap-on mounting for 35 mm DIN rail.

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

Specifications

3RH2122-2BB40-ZW96 — Identification
ParameterValue
Contactor frame sizeS00
3RH2122-2BB40-ZW96 — 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
3RH2122-2BB40-ZW96 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RH2122-2BB40-ZW96 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH2122-2BB40-ZW96 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail
3RH2122-2BB40-ZW96 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH2122-2BB40-ZW96 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH2122-2BB40-ZW96 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm
3RH2122-2BB40-ZW96 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It carries two normally-open instantaneous contacts, rated for 10 A at 24 V and 10 A at 230 V, with a 24 VDC coil that pulls 4 W to close and holds at 4 W. It mounts via screw or snap-on onto a standard 35 mm DIN rail, and the S00 footprint — 45 mm wide, 70 mm tall, 73 mm deep — means it takes up a single 45 mm slot in a panel.

The 24 VDC coil is the control voltage — that's what the PLC output or pushbutton circuit must supply. The 4 W holding power is low enough to be driven by a standard 24 VDC power supply without a separate interposing relay, but the coil's closing power is also 4 W, so there's no inrush spike to worry about. The contact ratings at different voltages tell you what load it can switch at each voltage level: 10 A at 24 V, 10 A at 230 V, 3 A at 400 V, 1 A at 690 V. These are the thermal current ratings for the contacts in AC duty — the actual switching capacity for motor or inductive loads will be lower, but for control-circuit isolation or signaling these are the numbers to match against your load. Storage range extends to -55 to +80 °C, which covers shipping and warehouse conditions.

For a procurement buyer filling a BOM line, this is a straightforward RFQ item: the part is specified, the ratings are clear, and there's no lifecycle risk. The SIRIUS series is widely stocked, so the lead time should be standard for the line — no special factory order required unless volumes are high.

Width is 45 mm.

Frequently asked questions

What are the key dimensions for panel layout?

The part measures 45 mm wide, 70 mm tall, and 73 mm deep. Clearance requirements are 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm to the side.

What is the coil voltage and power consumption?

The coil is rated for 24 VDC, with a closing power of 4 W and a holding power of 4 W.

What contact configuration does this auxiliary contactor have?

It has 2 normally-open (NO) instantaneous contacts.

MPN
3RH2122-2BB40-ZW96