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Siemens 3RT2036-3KB40 — Contactors

Siemens 3RT2036-3KB40 SIRIUS Coupling Contactor, S2, 24 VDC

MPN3RT2036-3KB40
Active

Siemens SIRIUS coupling contactor, S2 size, 24 VDC coil, spring-type terminals, rated DC switching 10 A at 24 V.

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

3RT2036-3KB40 — Identification
ParameterValue
Contactor frame sizeS2
3RT2036-3KB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V41 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V10 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2036-3KB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2036-3KB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2036-3KB40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 160 A (690 V, 100 kA), aM: 80 A (690 V, 100 kA), BS88: 125 A (415 V, 80 kA)
Short-circuit coordination type 2, fusegG: 80A (690V,100kA), aM: 50A (690V,100kA), BS88: 63A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2036-3KB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
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
3RT2036-3KB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2036-3KB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2036-3KB40 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm

Product details

It is designed for DC load switching and auxiliary signal isolation in control panels where a compact, screwless termination is preferred. Rated DC-13 switching capacity: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V. These are the contact ratings for breaking DC inductive loads — the voltage step matters because DC arcs sustain longer than AC, so the contactor's gap and arc-chamber design govern the curve. Mechanical switching frequency varies by duty class: 1 000 cycles/hour at AC-1 (resistive), 600 at AC-2 (slip-ring motor), 800 at AC-3 and AC-3e (squirrel-cage motor starting), and 250 at AC-4 (plugging/inching). The AC-4 ceiling is the binding limit for reversing or jogging applications. Coil inrush peaks at 2.6 A; the DC-13 switching times show an arcing period of 10–20 ms and a total DC operating time of 30–55 ms.

Panel Fit and Clearance

Footprint: 55 mm wide, 114 mm high, 130 mm deep. These are minimum air gaps for arc extinction and heat dissipation; stacking contactors closer than these values forces a derating review. Spring-type terminals accept 2× (0.5–2.5 mm²) solid or stranded conductors. The spring cage eliminates screw-torque variability on the coil circuit — one less thing to check during panel commissioning.

The storage ceiling exceeds the operating limit — that governs handling and transit, not running conditions. For panels in non-conditioned enclosures, the –25 °C floor is the cold-start boundary to verify.

Frequently asked questions

What are the mounting dimensions and clearances for 3RT2036-3KB40?

Width 55 mm, height 114 mm, depth 130 mm. Minimum clearances: 10 mm up, 10 mm forward, 10 mm down, 6 mm side. Mounts on 35 mm DIN rail per DIN EN 60715 via screw or snap-on.

MPN
3RT2036-3KB40