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Siemens 3RH1921-1HA22-ZX95 — Contactors

Siemens 3RH1921-1HA22-ZX95 SIRIUS Auxiliary Switch Block, 2

MPN3RH1921-1HA22-ZX95

Siemens SIRIUS 3RH1921-1HA22-ZX95 auxiliary switch block, 2 NO + 2 NC contacts, 10 A rated, screw-type terminals, snap-on mounting for 3RT1 contactors, 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

3RH1921-1HA22-ZX95 — 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
3RH1921-1HA22-ZX95 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1921-1HA22-ZX95 — Connection & Mounting
ParameterValue
Mounting methodsnap-on mounting
3RH1921-1HA22-ZX95 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1921-1HA22-ZX95 — Mechanical
ParameterValue
Width44 mm
Height38 mm
Depth51 mm

Product details

Contact ratings and switching reliability

The 3RH1921-1HA22-ZX95: Rated at 10 A maximum, the block delivers 6 A at 24 V DC and 6 A at 230 V AC (AC-15). At 400 V AC the rating drops to 3 A; at 690 V AC-15 it holds 1 A. The DC switching curve follows: 6 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. Mechanical service life is 10 million switching cycles typical.

Integration with 3RT1 contactors

Snap-on mounting directly onto the contactor face — no DIN rail required. The block is 44 mm wide, 51 mm deep, and 38 mm tall, sized to sit flush on 3RT1 frames S0 through S12. Screw terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. Front-side IP20 protection covers the terminals.

Frequently asked questions

What replaces 3RH1921-1HA22-ZX95?

The official successor is the SIRIUS 3RH2 series auxiliary switch blocks. The 3RH1921-1HA22-ZX95 is a 4-pole block for 3RT1 contactors; the 3RH2 blocks are the current-generation replacement.

What is the note 'with 3RT1' on this part?

The note indicates the auxiliary switch block is designed for mechanical and electrical interlocking with Siemens 3RT1 motor contactors. It snaps onto the contactor face without additional hardware.

What are the key ratings of 3RH1921-1HA22-ZX95?

Maximum 10 A. At 24 V DC: 6 A. At 230 V AC: 6 A. At 400 V AC: 3 A. Mechanical life: 10 million cycles. Contact reliability: 1 fault per 100 million at 17 V, 1 mA. Insulation voltage: 690 V AC at pollution degree 3.

Where can I buy 3RH1921-1HA22-ZX95?

We source and quote this part to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is stated here.

What is the difference between 3RH1921-1HA22-ZX95 and 3RH2122-1WB40?

The 3RH1921-1HA22-ZX95 is a 4-pole auxiliary switch block for 3RT1 contactors (S0 to S12), while the 3RH2122-1WB40 is a coupling relay for auxiliary circuits on size S00 contactors. The 3RH2122-1WB40 includes a varistor surge suppressor, has a 30-million-cycle mechanical life, and mounts on DIN rail. They are not direct drop-in replacements — the 3RH1921 snaps onto the contactor; the 3RH2122 mounts separately.

MPN
3RH1921-1HA22-ZX95