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Siemens 3RH6921-1DA11 — Contactors

Siemens 3RH6921-1DA11 SIRIUS Auxiliary Switch, 10 mm, snap-o

MPN3RH6921-1DA11

Siemens SIRIUS auxiliary switch, 3RH6921-1DA11, 10 mm width, snap-on mounting for S0 contactors, 6 A at 24 V, mirror contact per IEC 60947-4-1.

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

Specifications

3RH6921-1DA11 — Identification
ParameterValue
Contactor frame sizeS0
3RH6921-1DA11 — 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
3RH6921-1DA11 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH6921-1DA11 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodsnap-on mounting
3RH6921-1DA11 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH6921-1DA11 — Mechanical
ParameterValue
Width10 mm
Height57.4 mm
Depth66 mm

Product details

At 10 mm wide, it adds one normally open instantaneous contact without increasing the contactor's panel depth beyond 66 mm.

Switching capacity and contact reliability

The contact is rated for 6 A at 24 V and 230 V, with derated values across the voltage range: 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V and 250 V, and 3 A at 400 V. For AC-15 inductive loads at 690 V, the rated operational current is 1 A. The AC-15 ratings at lower voltages are 10 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 endurance and wiring

The snap-on fastening method means it clips directly onto the contactor without tools — no DIN rail or additional hardware required. Wiring accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded conductors, or the equivalent AWG sizes 20-16 and 18-14. Finely stranded wire with core-end processing uses the same cross-section ranges.

Frequently asked questions

Where can I buy 3RH6921-1DA11 and get a price?

The 3RH6921-1DA11 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

Will 3RH6921-1DA11 drop into a panel specified around 3RH6140-1BF40 without rewiring?

Both are SIRIUS auxiliary switches for S0 contactors, but the 3RH6140-1BF40 is a different form factor. The 3RH6921-1DA11 is 10 mm wide and snap-on mounted, while the 3RH6140-1BF40 is a screw-type terminal block. Panel fit depends on the contactor frame and wiring method — verify the mounting interface before substitution.

What compliance documentation does Siemens provide for 3RH6921-1DA11?

The product carries RoHS compliance per a substance prohibition date of May 1, 2012. It is a mirror contact per IEC 60947-4-1, with a rated surge voltage resistance of 6 kV. Standard Siemens documentation includes the declaration of conformity and CE marking.

MPN
3RH6921-1DA11