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Siemens 3RT2037-3AL20-ZX95 — Contactors

Siemens SIRIUS 3RT2037-3AL20-ZX95 Power Contactor, S2, 480V

MPN3RT2037-3AL20-ZX95

Siemens SIRIUS S2 power contactor, 3RT2037-3AL20-ZX95, 480 V rated value 65 A, screw and snap-on mounting onto 35 mm DIN rail, spring-type coil terminals.

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

3RT2037-3AL20-ZX95 — Identification
ParameterValue
Contactor frame sizeS2
3RT2037-3AL20-ZX95 — 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
3RT2037-3AL20-ZX95 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.36
Rated value @ 50 Hz230 V
3RT2037-3AL20-ZX95 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2037-3AL20-ZX95 — 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)
3RT2037-3AL20-ZX95 — 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
3RT2037-3AL20-ZX95 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2037-3AL20-ZX95 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2037-3AL20-ZX95 — Mechanical
ParameterValue
Width55 mm
Height114 mm
Depth130 mm
3RT2037-3AL20-ZX95 — Specifications
ParameterValue
At AC10 ... 18 ms

Product details

Its headline rating is 65 A at 480 V under AC-3 duty — that's the current it can reliably switch for a standard squirrel-cage motor during starting and running, which is the most common application for this class of contactor. The AC-3 rating is what governs fit for motor starting; a contactor's AC-1 resistive rating would be higher, but AC-3 is the number that matters for inductive motor loads.

Switching frequency and endurance

Rated for up to 700 switching cycles per hour under AC-3 duty, and 800 under AC-1 resistive load. That's typical for a general-purpose contactor — enough for conveyor cycling or pump starts, but not for high-speed indexing applications where you'd need a dedicated DC-operated or higher-frequency device.

Coil and auxiliary contacts

The magnet coil connection uses spring-type terminals, which speeds up wiring compared to screw terminals — no torque driver needed, just strip and insert. The contactor carries an auxiliary switch block (1 N/O + 1 N/C configuration from the main contact count of 18...1), so it can report its status back to a PLC or safety relay without an add-on module.

Clearances and thermal environment

Dimensions are 114 mm high, 55 mm wide, and 130 mm deep — the S2 footprint is compact enough for high-density panel layouts.

Frequently asked questions

What are the key dimensions for panel layout?

The contactor measures 114 mm high, 55 mm wide, and 130 mm deep. It requires 10 mm clearance upwards, downwards, and forwards, and 6 mm at the sides for arc dissipation and airflow.

What is the AC-3 rating and why does it matter?

The AC-3 rating is 65 A at 480 V. AC-3 is the standard duty category for starting and stopping squirrel-cage induction motors under full load — it's the rating that determines whether this contactor can handle your motor branch circuit during the starting inrush and running condition.

Does this contactor include auxiliary contacts?

Yes, it has an auxiliary switch block integrated, with a main contact configuration of 18 normally-open and 1 normally-closed (18...1). This allows status feedback to a PLC or safety relay without an external add-on module.

What type of coil connection does it use?

The magnet coil uses spring-type terminals (push-in or cage-clamp style), which accept solid or stranded conductors up to 2x 0.5 to 2.5 mm². No screw torque specification needed — just strip and insert.

MPN
3RT2037-3AL20-ZX95