Skip to main content
Log in
Siemens 3RT2037-1AC20 — Contactors

Siemens 3RT2037-1AC20 SIRIUS Power Contactor, 65 A AC-3

MPN3RT2037-1AC20
Active

Siemens SIRIUS S2 power contactor, 3RT2037-1AC20, rated 65 A at 480 V AC-3, 24 V 50 Hz coil, screw terminals, DIN-rail mount.

$114.30Ref. price · indicative, final on quote
Siemens 3RT2037-1AC20 datasheet (PDF)
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

3RT2037-1AC20 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-1AC20 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V55 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
3RT2037-1AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.36
Rated value @ 50 Hz24 V
3RT2037-1AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-1AC20 — 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: 125A (690V,100kA), aM: 63A (690V,100kA), BS88: 100A (415V,80kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2037-1AC20 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
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
3RT2037-1AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-1AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-1AC20 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm
3RT2037-1AC20 — Specifications
ParameterValue
At AC10 ... 18 ms

Product details

S2 Frame, 65 A AC-3 Motor Switching

The Siemens 3RT2037-1AC20 is a SIRIUS S2 power contactor rated for 65 A at 480 V in AC-3 duty, meaning it handles motor switching loads up to that current — typical for a 30–40 kW motor at 480 V depending on the exact FLA. The 24 V 50 Hz coil draws 0.36 A at 50 Hz and 0.39 A at 60 Hz.

The envelope is 130 mm deep, 55 mm wide, 114 mm high.

Switching Performance and Auxiliaries

Maximum switching rates: 800 cycles/h in AC-1 (resistive), 700/h in AC-3 (motor), 400/h in AC-2, 200/h in AC-4 (plugging/inching). Arcing time is 10–20 ms, and the contactor includes an auxiliary switch block with 1 N/O + 1 N/C configuration. The main contact screw terminals accept 2x (0.5–1.5 mm²) or 2x (0.75–2.5 mm²) solid or stranded wire.

Current production lifecycle stage per Siemens.

Frequently asked questions

What is the price of 3RT2037-1AC20 in bulk?

Helps buyers budget for large orders and compare distributor pricing.

Is 3RT2037-1AC20 in stock now?

Determines immediate availability to avoid production delays.

What is the difference between 3RT2037-1AC20 and 3RT2037-1AB20?

Ensures correct coil voltage selection for the control circuit.

What is the lifecycle status of 3RT2037-1AC20?

Confirms whether the part is active, obsolete, or nearing end-of-life.

What are the exact dimensions of 3RT2037-1AC20?

Critical for panel layout and physical fit in the enclosure.

What is the maximum switching frequency for 3RT2037-1AC20?

Determines suitability for high-cycle applications like motor starting.

MPN
3RT2037-1AC20