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Siemens 3RH1440-1AD00 — Contactors

Siemens 3RH1440-1AD00 SIRIUS Auxiliary Contactor, 4 NO, S00,

MPN3RH1440-1AD00

Siemens SIRIUS auxiliary contactor, 3RH1440-1AD00, size S00, 4 NO instantaneous contacts, 10 A thermal current, screw and snap-on mounting, IP20 front.

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

Specifications

3RH1440-1AD00 — Identification
ParameterValue
Contactor frame sizeS00
3RH1440-1AD00 — 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
3RH1440-1AD00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz42 V
3RH1440-1AD00 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1440-1AD00 — 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
3RH1440-1AD00 — Durability
ParameterValue
Durability (operating cycles, typ.)5 000 000
Durability with aux. switch block (cycles, typ.)5 000 000
3RH1440-1AD00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1440-1AD00 — Mechanical
ParameterValue
Width90 mm
Height57.5 mm
Depth72 mm

Product details

It is sized as S00, the smallest frame in the SIRIUS family, which means it occupies a 90 mm wide by 57.5 mm tall footprint on the DIN rail, with a depth of 72 mm from the mounting surface to the front of the housing. The contacts are rated for a thermal current of 10 A at 24 V, with switching capacities that derate with voltage: 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. This makes it suitable for pilot-duty control of PLC inputs, relay coils, contactor coils, and indicator lamps within a control panel.

Terminals accept solid conductors from 0.5 mm² up to 4 mm², with dual-wire capability at the smaller sizes — 2 × (0.5 to 1.5 mm²) and 2 × (0.75 to 2.5 mm²). This covers most control-circuit wiring gauges used in panel building.

Electrical performance and environment

Surge voltage withstand is 6 kV, giving adequate clearance for 400 V line-to-line systems. Shock resistance is specified at 10 g for 5 ms and 5 g for 10 ms, which covers most vibration environments in fixed industrial machinery.

The auxiliary switch is field-expandable (product extension auxiliary switch: Yes), meaning additional contact blocks can be added to the side of this unit if the four NO contacts are insufficient for the control scheme. The part carries the SIRIUS brand and is designed for global use with approvals that typically include UL, CSA, and CE (verify specific certification markings on the nameplate for your jurisdiction).

Frequently asked questions

What are the key ratings of 3RH1440-1AD00?

It provides four NO instantaneous contacts rated at 10 A thermal current at 24 V. Switching capacity derates with voltage: 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. The contactor is size S00, mounts on DIN rail, and has an IP20 front face.

What is the mounting footprint of 3RH1440-1AD00?

Width is 90 mm, height is 57.5 mm, and depth is 72 mm. It snaps onto a 35 mm DIN rail or can be screw-mounted. The mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward or backward.

What wire sizes does 3RH1440-1AD00 accept?

Terminals accept solid conductors: 2 × (0.5 to 1.5 mm²), 2 × (0.75 to 2.5 mm²), and 2 × 4 mm². This covers typical control-circuit wiring gauges.

What compliance documentation is available for 3RH1440-1AD00?

RoHS compliance is confirmed with a substance prohibition date of July 1, 2006. The part is a Siemens SIRIUS product designed for global markets; typical certifications include UL, CSA, and CE. Verify specific approval markings on the nameplate for your jurisdiction.

MPN
3RH1440-1AD00