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Siemens 3RT2037-1AH04 — Contactors

Siemens 3RT2037-1AH04 SIRIUS Power Contactor, S2, 65 A at 48

MPN3RT2037-1AH04
Active

Siemens SIRIUS power contactor, 3RT2037-1AH04, size S2, 65 A at 480 V, screw terminals, 55 mm wide.

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

3RT2037-1AH04 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-1AH04 — 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 V6 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2037-1AH04 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.37
Rated value @ 50 Hz48 V
3RT2037-1AH04 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-1AH04 — 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)
3RT2037-1AH04 — 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
3RT2037-1AH04 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-1AH04 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-1AH04 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth174 mm
3RT2037-1AH04 — Specifications
ParameterValue
At AC10 ... 18 ms

Product details

The Siemens SIRIUS 3RT2037-1AH04 is a size S2 power contactor rated for 65 A at 480 V in AC-3 duty — the motor-switching rating that governs real load handling.

The 65 A AC-3 rating at 480 V is the figure that decides whether this contactor handles a given motor load — AC-3 covers starting and disconnecting of squirrel-cage motors under full load. At 400 V the rated current drops to 3 A, so the 480 V figure is the high-side capability; at lower voltages the contactor carries higher currents. Size S2 means it fits the standard SIRIUS frame, so auxiliary blocks, overload relays, and busbar systems from the same S2 family mate directly without adapters.

Depth is 174 mm, which is the dimension to watch when laying out gland plates or door clearance.

Frequently asked questions

What are the key dimensions for panel layout?

Width 55 mm, height 114 mm, depth 174 mm. Clearance: 10 mm upwards, forwards, and downwards; 6 mm at the sides.

What is the AC-3 current rating at 480 V?

65 A at 480 V in AC-3 duty — this is the motor-switching rating that determines load capability.

Does the 3RT2037-1AH04 mount on standard DIN rail?

Yes, screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715.

MPN
3RT2037-1AH04