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Siemens 3RT2047-1NB34 — Contactors

Siemens 3RT2047-1NB34 SIRIUS Power Contactor, 20-33 VDC Coil

MPN3RT2047-1NB34
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Siemens SIRIUS power contactor, size S3, 3RT2047-1NB34, 20-33 VDC coil, screw-type terminals, 70 mm width, 140 mm height, 195 mm depth.

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

Specifications

3RT2047-1NB34 — Identification
ParameterValue
Contactor frame sizeS3
3RT2047-1NB34 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V97 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V20 hp
Rated value @ 24 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2047-1NB34 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz3.5 VA
Rated value @ 50 Hz20 ... 33 V
3RT2047-1NB34 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2047-1NB34 — 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: 200A (690V,100kA), aM: 100A (690V,100kA), BS88: 160A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2047-1NB34 — 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
3RT2047-1NB34 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2047-1NB34 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2047-1NB34 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth195 mm
3RT2047-1NB34 — Specifications
ParameterValue
At AC38 ... 57 ms

Product details

It mounts on a 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening, and accepts a +/-180° rotation on a vertical surface plus a +/-22.5° tilt forward or backward — useful when fitting into a crowded enclosure where gland-plate clearance is tight. The coil operates on a 20-33 VDC range, so it will pull in reliably on a nominal 24 VDC supply and hold through dips down to 20 V. Inrush current peaks at 6.5 A; steady-state draw is 3.5 VA at both 50 and 60 Hz for the AC variants, but this DC-coil version avoids the hum and heat of an AC coil — a plus for panels with tight thermal budgets. Switching capacity at DC voltages is rated per the table: 6 A at 24 V, 2 A at 48 V, 2 A at 60 V, and 1 A at 110 V. For AC-3 motor duty, the contactor handles up to 850 switching cycles per hour; AC-4 (inching/plugging) drops to 200 1/h. The main contacts are rated for 10 to 2 operations at rated load — a standard endurance figure for this frame size.

The contactor accepts solid conductors from 2.5 to 16 mm² and stranded from 6 to 70 mm² on the main terminals. Auxiliary terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded. The coil connection uses screw-type terminals.

Frequently asked questions

Is the 3RT2047-1NB34 compatible with 24V DC?

Yes, the coil is rated 20-33 VDC, so a nominal 24 VDC supply is well within range. The contactor is rated to switch 6 A at 24 VDC.

Where can I buy the 3RT2047-1NB34 contactor?

This part is available to order through independent distribution. Submit an RFQ for current pricing and lead time — availability is confirmed at quote time.

What are the auxiliary contacts on 3RT2047-1NB34?

The contactor includes an auxiliary switch as standard. The auxiliary terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded conductors.

MPN
3RT2047-1NB34