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Siemens 3RH1440-1AH00 — Contactors

Siemens 3RH1440-1AH00 SIRIUS Auxiliary Contactor, 4 NO, 10 A

MPN3RH1440-1AH00

Siemens SIRIUS auxiliary contactor, size S00, 4 instantaneous NO contacts, 10 A at 24 V, screw and snap-on mounting, IP20 front, current production.

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

Specifications

3RH1440-1AH00 — Identification
ParameterValue
Contactor frame sizeS00
3RH1440-1AH00 — 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
3RH1440-1AH00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz48 V
3RH1440-1AH00 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1440-1AH00 — 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
3RH1440-1AH00 — Durability
ParameterValue
Durability (operating cycles, typ.)5 000 000
Durability with aux. switch block (cycles, typ.)5 000 000
3RH1440-1AH00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1440-1AH00 — Mechanical
ParameterValue
Width90 mm
Height57.5 mm
Depth72 mm

Product details

SIRIUS auxiliary contactor, 4 NO, size S00

Rated 10 A at 24 V, with a surge voltage resistance of 6 kV and pollution degree 3, it handles the typical 24 VDC control loops found in industrial panels while maintaining clearance for dirty environments. Contact reliability is specified at one incorrect switching operation per 100 million cycles at 17 V, 1 mA — a figure that matters for PLC-level signal switching where dry-contact reliability is the real constraint.

Fastens via screw or snap-on onto a DIN rail; the 57.5 mm height and 90 mm width fit the standard S00 footprint, leaving the 72 mm depth for wiring clearance behind the panel door. Terminal capacity accepts solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² — enough for daisy-chaining control wiring without extra junction blocks.

Frequently asked questions

What is the mounting and wiring specification?

Screw or snap-on DIN rail mounting, size S00 footprint (57.5 × 90 × 72 mm), terminal capacity for solid conductors up to 2x 4 mm².

What compliance documentation is available for 3RH1440-1AH00?

RoHS compliance dated July 1, 2006, IP20 front protection, and pollution degree 3 rating are specified. The part carries the SIRIUS brand designation.

MPN
3RH1440-1AH00