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Siemens 3RT1275-6AF36 — Contactors

Siemens 3RT1275-6AF36 SIRIUS Vacuum Contactor, Size S12, 110

MPN3RT1275-6AF36
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Siemens SIRIUS vacuum contactor, Size S12, order code 3RT1275-6AF36, 110-127 V AC coil, screw-type terminals, 70-240 mm² stranded main circuit.

Siemens 3RT1275-6AF36 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT1275-6AF36 — Identification
ParameterValue
Contactor frame sizeS12
3RT1275-6AF36 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V350 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 @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT1275-6AF36 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.9
Rated value @ 50 Hz110 ... 127 V
3RT1275-6AF36 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1275-6AF36 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 800 A (690 V, 100 kA)
Short-circuit coordination type 2, fusegG: 800 A (690 V, 50 kA), aM: 630 A (690 V, 50 kA), BS88: 800 A (415 V, 50 kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT1275-6AF36 — Connection & Mounting
ParameterValue
Main circuit connectionConnection bar
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)
Conductor cross-section, solid or stranded2x (0,5 ... 1,5 mm²), 2x (0,75 ... 2,5 mm²), max. 2x (0,75 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew fixing
Side-by-side mountingYes
3RT1275-6AF36 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1275-6AF36 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1275-6AF36 — Mechanical
ParameterValue
Width160 mm
Height214 mm
Depth225 mm
3RT1275-6AF36 — Specifications
ParameterValue
At AC60 ... 100 ms

Product details

SIRIUS Vacuum Contactor, Size S12 — 3RT1275-6AF36

The Siemens 3RT1275-6AF36 is a SIRIUS vacuum contactor in Size S12, designed for high-cycle motor switching where arc extinction and contact life are critical. Vacuum interrupters handle the arc in a sealed chamber, so the contactor sees minimal contact erosion even under heavy AC-3 or AC-4 duty — rated at 750 operations per hour for AC-3 and 250 ops/hr for AC-4. The coil is wound for 110-127 V AC (50/60 Hz) with a pickup threshold of 0.8 x rated value and a dropout of 0.1 x rated value, giving a clean pull-in margin on a nominal 120 V control circuit.

Fastened via screw fixing through an 11 mm hole — one mounting point. Main circuit wiring accepts stranded conductors from 70 up to 240 mm². The magnet coil uses screw-type terminals; auxiliary switch wiring accepts 2x (0.5-1.5 mm²) solid, 2x (0.75-2.5 mm²) solid, or max 2x (0.75-4 mm²) solid/stranded.

Operating Conditions and Ratings

Frequently asked questions

How do I get current pricing and availability for 3RT1275-6AF36?

Submit an RFQ through this listing. Pricing and availability are confirmed at quote time through independent distribution channels.

What is the closest functional second-source to 3RT1275-6AF36?

The peer 3RT1264-6AP36-0KA1 is a Size S12 vacuum contactor in the same SIRIUS family, but it carries a different coil voltage and auxiliary configuration. Panel fit is not guaranteed without verifying the coil rating and wiring scheme against the original specification.

What is the depth of 3RT1275-6AF36?

The depth is 225 mm.

What solid conductor sizes does the auxiliary switch accept?

The auxiliary switch terminals accept 2x (0.5-1.5 mm²), 2x (0.75-2.5 mm²), or max 2x (0.75-4 mm²) solid or stranded conductors.

MPN
3RT1275-6AF36