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Siemens 3RH1911-1MA20 — Contactors

Siemens 3RH1911-1MA20 Auxiliary Switch Block, 2 NO, 10 A, S0

MPN3RH1911-1MA20

Siemens SIRIUS 3RH1911-1MA20 auxiliary switch block, 2 NO, screw terminals, snap-on mounting for size S00 contactors, 10 A maximum, 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

3RH1911-1MA20 — 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
3RH1911-1MA20 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1911-1MA20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
3RH1911-1MA20 — Mechanical
ParameterValue
Width36.5 mm
Height37.5 mm
Depth41.5 mm

Product details

It carries a maximum thermal current of 10 A, with voltage-dependent ratings that define its real-world switching capability: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, 3 A at 400 V, and 0.3 A at 220 V. The AC-15 rating at 690 V is 1 A.

The screw-type 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. Depth is 41.5 mm, width 36.5 mm, height 37.5 mm — compact enough to fit alongside the contactor without crowding adjacent devices.

The voltage-dependent current table is the key selection tool. At 24 VDC the contacts handle 6 A; at 125 VDC it's also 6 A, but at 220 VDC it drops to 0.3 A. The AC-15 rating of 1 A at 690 V governs solenoid and contactor coil switching in higher-voltage control circuits. The insulation voltage is rated 690 V with pollution degree 3, and surge voltage resistance is 6 kV — this block is designed for industrial environments with transient stress. Mechanical life is 10 million switching cycles typical; the contact reliability figure (one error per 100 million at 17 V, 5 mA) means it's trustworthy for PLC-level signals where a dry contact must close every time.

Frequently asked questions

What replaces 3RH1911-1MA20?

The official preferred successor is the SIRIUS 3RH2911-1MA20. It is the same form factor and function for S00 contactors.

Where can I buy 3RH1911-1MA20?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
3RH1911-1MA20