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Siemens 3RT2037-3AC20 — Contactors

Siemens 3RT2037-3AC20 SIRIUS Power Contactor, 65 A at 480 V

MPN3RT2037-3AC20
Active

Siemens SIRIUS S2 power contactor, 3RT2037-3AC20, 65 A at 480 V AC-3, spring-type coil terminals, screw and snap-on DIN rail mount.

Siemens 3RT2037-3AC20 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

3RT2037-3AC20 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-3AC20 — 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
3RT2037-3AC20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.36
Rated value @ 50 Hz24 V
3RT2037-3AC20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-3AC20 — 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)
3RT2037-3AC20 — 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 standard mounting rail according to DIN EN 60715
Side-by-side mountingYes
3RT2037-3AC20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-3AC20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-3AC20 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm
3RT2037-3AC20 — Specifications
ParameterValue
At AC10 ... 18 ms

Product details

The Siemens 3RT2037-3AC20 is a SIRIUS S2-frame power contactor rated for 65 A at 480 V in AC-3 duty — the motor-switching curve that governs most induction-motor loads up to that current.

The S2 frame footprint is 55 mm wide, 114 mm tall, and 130 mm deep.

Switching performance and operating rates

Maximum operating frequency varies by duty: 800 cycles/hour for AC-1 resistive loads, 700 cycles/hour for AC-3 motor starting, and 200 cycles/hour for AC-4 plugging/reversing. Arcing time spans 10 to 20 ms; the main contactor is rated for 10 million mechanical operations typical.

Environmental limits and auxiliary contacts

Coil draws 0.36 A at 50 Hz and 0.39 A at 60 Hz at 24 V rated value.

Frequently asked questions

What is the closest functional second-source for 3RT2037-3AC20?

The 3RT2015-2AP02 is a smaller S0-frame contactor from the same SIRIUS family, but it does not match the 65 A AC-3 rating of the S2-frame 3RT2037-3AC20. A panel built around the S0 frame would need rewiring to accommodate the larger S2 footprint and higher current path.

What are the key dimensions of 3RT2037-3AC20?

Width 55 mm, height 114 mm, depth 130 mm. Clearance: 10 mm upward, forward, and downward; 6 mm to the side.

Where can I buy 3RT2037-3AC20?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time.

MPN
3RT2037-3AC20