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Siemens 3RT2027-1NB30 — Contactors

Siemens 3RT2027-1NB30 SIRIUS Power Contactor, S0 Frame, 24V

MPN3RT2027-1NB30
Active

Siemens SIRIUS power contactor, 3RT2027-1NB30, S0 frame size, 24 V DC coil, screw-type terminals, 10 A rated switching capacity at 24 V, snap-on mounting on 35 mm DIN rail.

$93.98Ref. price · indicative, final on quote
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

3RT2027-1NB30 — Identification
ParameterValue
Contactor frame sizeS0
3RT2027-1NB30 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V22 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V5 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2027-1NB30 — Control & Coil
ParameterValue
Control supply voltage typeAC/DC
Rated value @ 50 Hz0.86
Rated value @ 50 Hz21 ... 28 V
3RT2027-1NB30 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2027-1NB30 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 125A (690V,100kA), aM: 50A (690V,100kA), BS88: 125A (415V,80kA)
Short-circuit coordination type 2, fusegG: 50A (690V,100kA), aM: 25A (690V, 100kA), BS88: 50A (415V, 80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2027-1NB30 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid1 ... 10 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
3RT2027-1NB30 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2027-1NB30 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2027-1NB30 — Mechanical
ParameterValue
Width45 mm
Height85 mm
Depth107 mm
3RT2027-1NB30 — Specifications
ParameterValue
At AC30 ... 50 ms

Product details

Part Identity and Fit

It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward, giving flexibility in tight enclosures. The coil is rated 21–28 V DC, with a peak inrush of 3 A. At the 24 V rated value, the contactor switches 10 A; at 48 V and 60 V, it handles 2 A. This makes it suitable for 24 V DC control circuits common in automotive and machine tool lines. Main contact wiring accepts solid or stranded conductors from 1 to 10 mm², and auxiliary contacts accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The coil uses screw-type terminals, consistent with panel-builder practices for secure terminations.

Rated for up to 1,000 operations per hour in AC-1 resistive load duty, 750 ops/h in AC-2 and AC-3 motor switching, and 250 ops/h in AC-4 (plugging/inching). The AC-3e rating also allows 750 ops/h. These limits define the thermal cycling capability — exceeding them risks contact welding or premature wear, especially in high-inertia or reversing applications. Arcing time is specified at 10 ms, with operate and release times of 30–50 ms for both AC and DC coils. This is typical for a contactor of this class and ensures predictable switching behavior in sequenced control schemes.

Clearance distances required: 10 mm upwards, downwards, and forwards; 6 mm at the side. These are minimums for arc flash containment and must be respected in panel layout to avoid phase-to-phase or phase-to-ground faults. Dimensions are 85 mm height, 45 mm width, and 107 mm depth — the S0 footprint fits standard 45 mm-wide DIN-rail slots, common in modular panel designs.

Frequently asked questions

What are the key dimensions for panel layout?

Height 85 mm, width 45 mm, depth 107 mm. Clearances: 10 mm up/down/forward, 6 mm at sides.

What conductor sizes does the 3RT2027-1NB30 accept?

Main contacts accept solid or stranded 1–10 mm². Auxiliary contacts accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²).

MPN
3RT2027-1NB30