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Siemens 3RT1275-6LA06 — Contactors

Siemens 3RT1275-6LA06 SIRIUS Vacuum Contactor, S12, 361 A at

MPN3RT1275-6LA06
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Siemens SIRIUS vacuum contactor, size S12, order code 3RT1275-6LA06, rated 361 A at 480 V AC-3, screw fixing, 225 mm depth.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RT1275-6LA06 — Identification
ParameterValue
Contactor frame sizeS12
3RT1275-6LA06 — 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 V250 kW
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
3RT1275-6LA06 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
3RT1275-6LA06 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT1275-6LA06 — 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)
3RT1275-6LA06 — 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
3RT1275-6LA06 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT1275-6LA06 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT1275-6LA06 — Mechanical
ParameterValue
Width160 mm
Height214 mm
Depth225 mm
3RT1275-6LA06 — Specifications
ParameterValue
At AC60 ... 100 ms

Product details

The 361 A at 480 V AC-3 rating is the figure that governs motor load fit — a 480 V motor drawing, say, 320 A full-load current is within range; a 380 A motor would exceed the contactor's rated making and breaking capacity in that duty class. Switching frequency limits are specified per duty class: up to 750 operations per hour in AC-3 and AC-3e, 700 in AC-1 (resistive), and 250 in AC-2 and AC-4 (slip-ring motor starting and plugging/reversing).

Mounting is by screw fixing through an 11 mm hole; the contactor can be rotated ±22.5° on a vertical surface, tilted forward/backward ±22.5°, or stood on a horizontal surface. Dimensions are 214 mm high, 160 mm wide, and 225 mm deep — the depth being the dimension to account for when planning gland-plate clearance or enclosure depth. Clearance distances: 10 mm upwards and downwards, 10 mm to the side, 20 mm forwards. Main power connections accept stranded cable from 70 to 240 mm²; auxiliary and coil connections accept solid or stranded conductors from 0.5 to 4 mm².

Frequently asked questions

What are the key dimensions for panel planning?

Height is 214 mm, width is 160 mm, and depth is 225 mm. Clearance requirements are 10 mm upwards, 10 mm downwards, 10 mm to the side, and 20 mm forwards.

What is the AC-3 rating at 480 V?

The contactor is rated 361 A at 480 V in AC-3 duty, which is the category for starting and stopping squirrel-cage induction motors.

What cable sizes does the main power connection accept?

The main power terminals accept stranded cable from 70 mm² up to 240 mm².

MPN
3RT1275-6LA06