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Siemens 3RT2045-1CP04-3MA0 — Contactors

Siemens SIRIUS 3RT2045-1CP04-3MA0 Power Contactor, 77 A at 4

MPN3RT2045-1CP04-3MA0
Active

Siemens SIRIUS S3 power contactor, 3RT2045-1CP04-3MA0, 77 A at 480 V, screw and snap-on DIN rail, current production.

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

3RT2045-1CP04-3MA0 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-1CP04-3MA0 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V66 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V15 hp
Rated value @ 24 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2045-1CP04-3MA0 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.38
Rated value @ 50 Hz230 V
3RT2045-1CP04-3MA0 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2045-1CP04-3MA0 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)
Short-circuit coordination type 2, fusegG: 160A (690V,100kA), aM: 80A (690V,100kA), BS88: 125A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2045-1CP04-3MA0 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2.5 ... 16 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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 onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2045-1CP04-3MA0 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-1CP04-3MA0 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-1CP04-3MA0 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth195 mm
3RT2045-1CP04-3MA0 — Specifications
ParameterValue
At AC10 ... 21 ms

Product details

Dimensions: 70 mm wide, 140 mm high, 195 mm deep.

Wiring and conductor ranges

Main contact terminals accept solid conductors 2.5–16 mm² or stranded 6–70 mm². The magnet coil uses screw-type terminals. Auxiliary switch terminals accept 2x (0.5–1.5 mm²) solid or stranded, or 2x (0.75–2.5 mm²).

Switching performance and thermal limits

Rated for AC-3 duty at 1,000 operating cycles per hour maximum, AC-1 at 900/h, AC-2 at 400/h, AC-4 at 300/h. Arcing time is 10–20 ms at 50 Hz with a power factor of 0.38. Mechanical life typical 10,000,000 operations.

Built-in auxiliary switch rated: 6 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 0.8 A at 440 V. Main contact rating: 15 hp at 230 V.

Frequently asked questions

What are the key dimensions of 3RT2045-1CP04-3MA0?

Width 70 mm, height 140 mm, depth 195 mm. It mounts on 35 mm DIN rail with minimum clearances of 10 mm upwards, 10 mm downwards, 10 mm at the side, and 20 mm forwards.

What conductor sizes does 3RT2045-1CP04-3MA0 accept?

Main contacts accept solid 2.5–16 mm² or stranded 6–70 mm². Auxiliary terminals accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²).

How do I get pricing and availability for 3RT2045-1CP04-3MA0?

Submit an RFQ through this listing. The part is sourced to order via independent distribution; current pricing and availability are confirmed at quote time.

Will 3RT2045-1CP04-3MA0 fit a panel designed for 3RT1054-1AB36?

Both are SIRIUS S3 contactors with identical mounting footprint (70×140×195 mm) and DIN rail attachment. The 3RT2045-1CP04-3MA0 should drop into the same panel without rewiring, provided the coil voltage and auxiliary configuration match.

MPN
3RT2045-1CP04-3MA0