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Siemens 3RH7140-1AN20 — Contactors

Siemens 3RH7140-1AN20 SIRIUS Contactor Relay, 4 NO, 690 V, 6

MPN3RH7140-1AN20

Siemens SIRIUS contactor relay, size S00, 4 NO auxiliary contacts, screw-type terminals, AC coil, 45 mm width, 72 mm depth, 57.5 mm height.

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

Specifications

3RH7140-1AN20 — Identification
ParameterValue
Contactor frame sizeS00
3RH7140-1AN20 — Ratings & Performance
ParameterValue
Rated value @ 400 V6 A
Rated value @ 690 V1 A
Rated value @ 230 V6 A
Rated value @ 24 V6 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RH7140-1AN20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz220 V
3RH7140-1AN20 — Contacts & Poles
ParameterValue
Auxiliary contact reliabilityacceptability for PLC control (17 V, 5 mA)
3RH7140-1AN20 — Connection & Mounting
ParameterValue
Conductor cross-section, solid or stranded2x (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 onto 35 mm standard mounting rail
3RH7140-1AN20 — Environmental
ParameterValue
Operating temperature range-10 ... +55 °C
Storage temperature range-25 ... +70 °C
Installation altitude, max.2 000 m
3RH7140-1AN20 — Mechanical
ParameterValue
Width45 mm
Height57.5 mm
Depth72 mm

Product details

Rated for AC control voltage, it switches loads across a wide voltage band: 6 A at 24 V, 230 V, and 400 V; 1 A at 110 V and 690 V; and 0.3 A at 220 V. The 690 V rating with 1 A makes it usable in 480 V panels for signal-level isolation without derating to a lower current class.

The S00 footprint — 45 mm wide, 72 mm deep, 57.5 mm tall — fits tightly in crowded enclosures; the 45 mm width matches a single 1.75-inch module pitch, so it occupies one position on a standard DIN-rail panel. This matters when you're squeezing it into a gland-plate area or a swing-frame panel where the rail isn't perfectly plumb. Screw-type terminals on the auxiliary and control circuit accept 2 × (0.5 to 1.5 mm²), 2 × (0.75 to 2.5 mm²), or 2 × 4 mm² solid or stranded wire. Finely stranded with ferrule is also supported at the same cross-sections.

Coil draw and thermal limits

The AC coil draws 27 VA inrush (pick-up) and 5.4 VA holding. The inductive power factor is 0.8 during pick-up and 0.27 during holding — the holding PF is low, so the steady-state VA is mostly reactive; a control transformer supplying multiple contactors should be sized for the sum of pick-up VA, not holding VA. Installation altitude is limited to 2 000 m above sea level without derating. Surge voltage resistance is rated at 10 kV, and insulation voltage at pollution degree 3 is 690 V AC — sufficient for 480 V line-to-line systems with a safety margin. Shock resistance: 15g / 5 ms and 8g / 10 ms sine pulse; 10g / 5 ms and 5g / 10 ms rectangular impulse. Maximum operating frequency at DC-13 load is 1 000 operations per hour — fine for most signal switching but not for high-speed counting applications.

Frequently asked questions

Will 3RH7140-1AN20 drop into a panel specified around 3RH6140-1AP00 without rewiring?

Yes — both are S00 frame size with the same 45 mm width, 72 mm depth, and screw-type terminals. The mounting hole pattern and DIN-rail clip are identical. The only difference is the coil: AC vs DC. If the control supply is AC, the 3RH7140-1AN20 is a direct mechanical and electrical drop-in.

MPN
3RH7140-1AN20