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Siemens 3RH1440-1AB00 — Contactors

Siemens 3RH1440-1AB00 SIRIUS Auxiliary Contactor, 4 NO, 10 A

MPN3RH1440-1AB00

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

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

Specifications

3RH1440-1AB00 — Identification
ParameterValue
Contactor frame sizeS00
3RH1440-1AB00 — 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
3RH1440-1AB00 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz24 V
3RH1440-1AB00 — Contacts & Poles
ParameterValue
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RH1440-1AB00 — 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
3RH1440-1AB00 — Durability
ParameterValue
Durability (operating cycles, typ.)5 000 000
Durability with aux. switch block (cycles, typ.)5 000 000
3RH1440-1AB00 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RH1440-1AB00 — Mechanical
ParameterValue
Width90 mm
Height57.5 mm
Depth72 mm

Product details

The 4 NO contacts are instantaneous (no leading, lagging, or delayed switching), so the contactor closes all poles simultaneously on coil energization. This matters for safety circuits where contact sequence must be predictable. Rated operational current varies with voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. The 690 V rating confirms suitability for 400 V line-to-line control circuits common in European panels. The coil operates at 50/60 Hz with a voltage tolerance of 0.8...1.1 x rated value at 50 Hz and 0.85...1.1 at 60 Hz. This means the contactor holds in reliably even if the control supply dips to 80% of nominal at 50 Hz.

Fastening method is screw and snap-on mounting to a DIN rail. The size S00 footprint is compact — fits alongside S00 contactors in a standard 45 mm DIN-rail pitch. Terminal capacity accepts solid conductors: 2x 0.5...1.5 mm², 2x 0.75...2.5 mm², and 2x 4 mm². This covers most control wiring gauges used in panel building.

Substance prohibition compliance date is 07/01/2006, aligning with RoHS and REACH requirements.

Frequently asked questions

What are the key ratings of the 3RH1440-1AB00?

It has 4 instantaneous NO contacts rated 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. Coil tolerance is 0.8...1.1 x rated at 50 Hz and 0.85...1.1 at 60 Hz. Mechanical endurance is 5 million operations typical.

What compliance documentation is available for the 3RH1440-1AB00?

The part carries a substance prohibition compliance date of 07/01/2006 (RoHS/REACH alignment) and a surge voltage resistance of 6 kV. Standard Siemens SIRIUS documentation includes CE, UL, and CSA certifications.

MPN
3RH1440-1AB00