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Siemens 3RH1140-1AK20 — Contactors

Siemens 3RH1140-1AK20 SIRIUS Auxiliary Contactor, 4 NO, S00,

MPN3RH1140-1AK20

Siemens SIRIUS auxiliary contactor, size S00, 4 NO contacts, 45 mm width, screw and snap-on mounting, IP20 front, 3RH1140-1AK20.

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

3RH1140-1AK20 — Identification
ParameterValue
Contactor frame sizeS00
3RH1140-1AK20 — 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 V6 A
Rated value @ 24 V10 A
Rated value @ 110 V1 A
Rated value @ 220 V0.27 A
3RH1140-1AK20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz120 V
3RH1140-1AK20 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1140-1AK20 — Connection & Mounting
ParameterValue
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting
3RH1140-1AK20 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RH1140-1AK20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1140-1AK20 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth72 mm

Product details

The Siemens 3RH1140-1AK20 is a SIRIUS auxiliary contactor in size S00, carrying four normally open (4 NO) instantaneous contacts with no delayed, lagging, or make-before-break switching — a straight-forward signal-follower for control circuits in motor starter assemblies or PLC output isolation. Rated operational current spans 10 A at 24 V up through 1 A at 690 V, with intermediate ratings at 110 V (1 A), 220 V (0.27 A), 230 V (6 A), 400 V (3 A), and 500 V (2 A) — covering the common control-voltage range from 24 VDC to 690 VAC.

Shock resistance 10g / 5 ms and 5g / 10 ms — fine for most fixed industrial machinery, not for mobile equipment.

Solid wire terminations accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and 2x 4 mm² — covers the typical control-circuit wire gauges from signal-level up to 4 mm² for longer runs. Surge voltage resistance rated at 6 kV.

Substance prohibitance per RoHS applies from July 1, 2006 — the part is RoHS-compliant for EU markets.

Frequently asked questions

What is 3RH1140-1AK20's contact configuration?

Four normally open (4 NO) instantaneous contacts — no delayed, lagging, or make-before-break switching. Leading and lagging contact counts are both zero.

What compliance documentation does Siemens provide for 3RH1140-1AK20?

RoHS compliance is confirmed with a substance prohibitance date of July 1, 2006. The part carries IP20 front protection and pollution degree 3 rating. Surge voltage resistance is 6 kV.

Will 3RH1140-1AK20 drop into a panel specified around 3RH2131-2AK60 without rewiring?

Both are SIRIUS auxiliary contactors in size S00 with 45 mm width and screw/snap-on DIN mounting, so the mechanical footprint matches. However, 3RH1140-1AK20 carries 4 NO contacts while 3RH2131-2AK60 has a different contact arrangement — verify your control circuit's NO/NC requirements before substituting.

MPN
3RH1140-1AK20