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Siemens 3RT2037-1AL20 — Contactors

Siemens SIRIUS 3RT2037-1AL20 Power Contactor, 65 A at 480 V

MPN3RT2037-1AL20
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Siemens SIRIUS power contactor, Size S2, 3RT2037-1AL20, 65 A at 480 V AC-3, 24 VDC coil, screw-type terminals, screw and snap-on mounting onto 35 mm DIN rail.

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

3RT2037-1AL20 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-1AL20 — 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
3RT2037-1AL20 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.36
Rated value @ 50 Hz230 V
3RT2037-1AL20 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-1AL20 — 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)
3RT2037-1AL20 — 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
3RT2037-1AL20 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-1AL20 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-1AL20 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm
3RT2037-1AL20 — Specifications
ParameterValue
At AC10 ... 18 ms

Product details

That's handy when you're shoehorning this into a crowded panel and the rail isn't perfectly straight. Dimensions: 114 mm high, 55 mm wide, 130 mm deep. That 130 mm depth means it'll sit deep in a 200 mm enclosure, but check your gland plate clearance if you're back-to-back with another row.

The headline number is 65 A at 480 V in AC-3 duty — that's the motor-switching current, not the resistive load. For resistive loads (AC-1), the switching rate maxes out at 800 cycles per hour; for AC-3 motor starts, it's 700 per hour. AC-4 (plugging/reversing) drops to 200 per hour. The coil draws 0.36 A at 50 Hz and 0.39 A at 60 Hz. For DC switching: 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, 0.6 A at 440 V. The auxiliary switch is included — no add-on module needed for basic status feedback.

Frequently asked questions

What are the mounting clearances?

10 mm upwards, forwards, and downwards; 6 mm at the sides. Depth is 130 mm from the DIN rail face.

MPN
3RT2037-1AL20