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Siemens 3RT2518-2BF40 — Contactors

Siemens 3RT2518-2BF40 SIRIUS Contactor, S00, 110 VDC Coil, S

MPN3RT2518-2BF40
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Siemens SIRIUS S00 contactor, 3RT2518-2BF40, 110 VDC coil, spring-type terminals, 45 mm width, 73 mm depth, 70 mm height.

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

3RT2518-2BF40 — Identification
ParameterValue
Contactor frame sizeS00
3RT2518-2BF40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated value @ 400 V3 A
Rated value @ 230 V10 A
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2518-2BF40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2518-2BF40 — Contacts & Poles
ParameterValue
Main poles4
Main NO contacts2
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2518-2BF40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 35 A (690 V, 100 kA)
Short-circuit coordination type 2, fusegG: 20A (690V, 100kA)
Aux. switch short-circuit protection, fusefuse gG: 10 A
3RT2518-2BF40 — Connection & Mounting
ParameterValue
Main circuit connectionspring-loaded terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2x (0.5 ... 4 mm²)
Conductor cross-section, solid or stranded2x (0,5 ... 4 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Side-by-side mountingYes
3RT2518-2BF40 — Durability
ParameterValue
Durability (operating cycles, typ.)30 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2518-2BF40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2518-2BF40 — Mechanical
ParameterValue
Width45 mm
Height70 mm
Depth73 mm
3RT2518-2BF40 — Specifications
ParameterValue
At AC10 000 1/h

Product details

It's built for panel integration — screws onto the backplate or snaps onto 35 mm DIN rail per EN 50022, and the mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward or backward. That means it fits into tight enclosures where you need to orient the contactor around busbars or duct.

This contactor is rated for DC switching across a range of voltages, and the current capability drops sharply as voltage rises — that's the physics of DC arc extinction. At 24 VDC it handles 10 A; at 48 V and 60 V it's rated 2 A; at 110 V it's 1 A; at 220 V it drops to 0.3 A; and at 600 V it's only 0.1 A. The arcing time is 10-15 ms, and the DC switching frequency is 7-13 ms. If you're switching a 24 VDC solenoid bank or a small DC motor brake, the 10 A rating gives you headroom. For a 110 VDC control circuit pulling 0.5 A, you're fine. But don't spec this for a 600 VDC string — the 0.1 A limit means it's really just for signal-level switching at that voltage.

AC Switching and Mechanical Life

The maximum mechanical switching frequency is 10,000 operations per hour, and at AC-1 resistive load it's 1,000 per hour. For a conveyor line cycling once every 30 seconds, that's about 28 years of service before the mechanism wears out. The coil pickup is at 80% of rated voltage (88 VDC for this 110 V unit), and the dropout threshold is 1.1 times the full-scale value — so it holds in well but drops cleanly when the control signal goes away.

Integration and Clearance

The contactor is 45 mm wide, 70 mm high, and 73 mm deep — a standard S00 footprint. Zero clearance needed above, below, forward, or backward.

Frequently asked questions

Where can I buy 3RT2518-2BF40 and get a price?

This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time — no stock or price figures published here.

Will 3RT2518-2BF40 drop into a panel specified for 3RT2526-1BF40 without rewiring?

No — the 3RT2526-1BF40 is a larger frame size (S0 vs S00). The 3RT2518-2BF40 is 45 mm wide; the S0 frame is wider. Terminal spacing and DIN rail footprint differ. You'd need to re-terminate and possibly adjust the panel layout.

What is the depth of 3RT2518-2BF40?

The depth is 73 mm. Combined with a 45 mm width and 70 mm height, it fits the standard S00 contactor envelope.

What wire sizes does the spring terminal accept?

The spring-type terminals accept 2x (0.5 to 4 mm²) solid or stranded conductors. That covers most control-circuit and small motor-load wiring.

MPN
3RT2518-2BF40