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Siemens 3RT2045-3NB30 — Contactors

Siemens 3RT2045-3NB30 SIRIUS Power Contactor, Size S3, 20-33

MPN3RT2045-3NB30
Active

Siemens SIRIUS power contactor, 3RT2045-3NB30, size S3, coil rated value 20... 33 V, spring-type coil terminals, screw and snap-on mounting onto 35 mm DIN rail, depth 152 mm, width 70 mm, height 140 mm.

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

Specifications

3RT2045-3NB30 — Identification
ParameterValue
Contactor frame sizeS3
3RT2045-3NB30 — 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 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2045-3NB30 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz3.5 VA
Rated value @ 50 Hz20 ... 33 V
3RT2045-3NB30 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2045-3NB30 — 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)
3RT2045-3NB30 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2.5 ... 16 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2045-3NB30 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2045-3NB30 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2045-3NB30 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm
3RT2045-3NB30 — Specifications
ParameterValue
At AC38 ... 57 ms

Product details

The coil is rated 20... 33 V and draws 3.5 VA at both 50 Hz and 60 Hz, with an inrush current peak of 6.5 A. Spring-type terminals on the coil simplify wiring — no screw tightening needed, just strip and insert.

Mechanical fit and mounting

Dimensions: 152 mm deep, 70 mm wide, 140 mm high. Solid wire range 2.5... 16 mm²; stranded 6... 70 mm²; also accepts 2x (0.5... 2.5 mm²) solid or stranded. The auxiliary switch is present (yes).

Arcing time 10... 20 ms; operate times at AC and DC both 38... 57 ms. Maximum switching frequency varies by duty: AC-1 (resistive) 900 1/h, AC-2 (slip-ring motors) 400 1/h, AC-3 (squirrel-cage motors) 1 000 1/h, AC-4 (plugging/inching) 300 1/h, AC-3e (enhanced AC-3) 1 000 1/h. For main contacts, the rated operational current at 24 V is 10 A, at 48 V 2 A, at 60 V 2 A, at 110 V 1 A. The typical mechanical life of the contactor is 10 000 000 operations.

Frequently asked questions

How do I get current pricing and availability for 3RT2045-3NB30?

Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time — no stock or price figures are published here.

What is 3RT2045-3NB30's listed depth?

The depth is 152 mm, with a width of 70 mm and height of 140 mm.

What solid wire range does 3RT2045-3NB30 accept?

Solid wire range is 2.5... 16 mm²; stranded wire 6... 70 mm²; also accepts 2x (0.5... 2.5 mm²) solid or stranded.

MPN
3RT2045-3NB30