Siemens 3RT20351AC20 Electromechanical Contactor

Catalog comparison (3RT2035 family — screening only)

The following side-by-side summary covers the primary part and in-catalog peers sharing the same base product number. All entries are Siemens 3RT2035 size S2 contactors; they share 80 ms operate time, DIN rail / chassis mounting, and auxiliary contact features. Voltage class and contact arrangement differ.

Why each is catalog-similar

• 3RT20351AC24 shares 24VAC coil, 20.4 VAC must-operate voltage, and 3PST-NO contact form with the primary. Its contact rating is 40 A versus 60 A, and its coil power is 188VA versus 210VA.
• 3RT20351AC10 matches the primary on contact form, mounting, operate time, and auxiliary-contact feature; coil voltage is 42VAC with a must-operate of 19.2 VAC, and contact rating is 40 A.
• 3RT20351AN20 aligns on base product number, auxiliary-contact feature, and mounting; coil voltage is 220VAC (must-operate 187 VAC), and contact rating is 40 A.
• 3RT20351AQ20 shares auxiliary contacts, 3PST-NO form, and mounting with 80 ms operate time; coil voltage is 230VAC (must-operate 195.5 VAC) and contact rating is 40 A.
• 3RT20351AM20 uses a DPST-NO/NC (1 Form A, 1 Form B) contact arrangement versus the primary's 3PST-NO; coil voltage is 208VAC and contact rating is 60 A.
• 3RT20351AH20 shares 60 A contact rating and 3PST-NO form; coil voltage is 48VAC (must-operate 40.8 VAC) with 188VA coil power.
• 3RT20351AG20 matches on 60 A rating and 3PST-NO contacts; coil voltage is 110VAC (must-operate 93.5 VAC) with 188VA coil power.
• 3RT20351AL20 has the same bulk encapsulation, 3PST-NO form, and 60 A rating; coil voltage is 230VAC (must-operate 195.5 VAC) with 210VA coil power.

All listed parts belong to Siemens size S2. Selection requires the reader's own coordination and overload relay compatibility assessment for the target motor branch.

Siemens 3RT2035 size S2 overview

The 3RT20351AC20 is a three-pole, size S2 industrial contactor in the Siemens 3RT2035 series. Key known parameters:

• Coil: 24VAC; must-operate threshold 20.4 VAC; inrush coil power 210VA
• Contacts: 3PST-NO (three normally-open poles); contact rating 60 A
• Auxiliary: auxiliary contact feature present
• Mounting: chassis mount / DIN Rail compatible
• Operate time: 80 ms
• Operating temperature: 25°C ~ 60°C
• Encapsulation: bulk

Integration considerations

Size S2 contactors in the 3RT2035 series are typically panel-mounted on DIN rail or chassis and are used in motor-branch or power-switching applications. Key integration points drawn from the catalog record:

• Confirm coil voltage and must-operate threshold match the control-circuit supply before selection.
• The 3PST-NO contact form provides three independent normally-open poles for main-power switching.
• Auxiliary contact feature supports auxiliary signal or interlock paths; exact configuration depends on the specific suffix code.
• Operating temperature range 25°C ~ 60°C bounds thermal conditions for enclosed panel environments.

No switching voltage, dielectric rating, or mechanical enclosure class is listed in the current catalog record; those parameters are not compared here.

FAQ

What is the contact rating of the 3RT20351AC20? 60 A across three normally-open poles (3PST-NO).

Can the 3RT20351AC24 substitute for the 3RT20351AC20? Both are 24VAC coils with identical must-operate voltage (20.4 VAC) and 3PST-NO contact form, but the AC24 has a 40 A contact rating versus 60 A on the primary. Screening requires reader qualification for the specific load.

What mounting options does the 3RT20351AC20 support? Chassis mount and DIN Rail; exact enclosure or IP rating is not specified in the catalog record.