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Siemens 3RA6120-1CB34 — Motor Starters

Siemens 3RA6120-1CB34 SIRIUS compact starter

MPN3RA6120-1CB34
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Siemens SIRIUS 3RA6120-1CB34 compact starter, direct starter, 1500 W at 400 V, 53 kA breaking capacity, 24 V DC/AC coil, screw terminals, 45 mm width.

Siemens 3RA6120-1CB34 datasheet (PDF)
StockContact for availability
Lead timeIn Stock wk
MOQ1 pcs
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
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Specifications

Identification

3RA6120-1CB34 — Identification
ParameterValue
Product designationcompact starter
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q

Ratings & Performance

3RA6120-1CB34 — Ratings & Performance
ParameterValue
Rated motor power at 400 V1 500 W
Rated motor power at 460/480 V (hp)2 hp
Rated motor power at 575/600 V (hp)3 hp
Rated current at 480 V4 A
Rated current at 600 V4 A
Rated impulse withstand voltage (Uimp)6 000 V

Protection & Tripping

3RA6120-1CB34 — Protection & Tripping
ParameterValue
Trip classCLASS 10 and 20 adjustable
Short-circuit protectionYes
Overload release setting range (current)1 ... 4 A
Duty / utilization type (IEC 60947-6-2)continous operation according to IEC 60947-6-2

Contacts & Control

3RA6120-1CB34 — Contacts & Control
ParameterValue
Rated voltage range at 50 Hz24 V
Auxiliary contacts, NO1
Auxiliary contacts, NC1
Auxiliary switch extensionYes

Mechanical & Connection

3RA6120-1CB34 — Mechanical & Connection
ParameterValue
Mounting / fastening methodscrew and snap-on mounting
Mounting positionany
Width45 mm
Height170 mm
Depth165 mm

Environmental

3RA6120-1CB34 — Environmental
ParameterValue
Operating temperature range-20 ... +60 °C
Storage temperature range-55 ... +80 °C
Transport temperature range-55 ... +80 °C
Pollution degree3

Product details

What this compact starter delivers

The Siemens 3RA6120-1CB34 is a SIRIUS compact starter — a direct starter that combines a contactor and overload relay in a single 45 mm-wide housing. It's rated for continuous motor duty per IEC 60947-6-2, so it handles sustained operation on pumps, fans, and conveyors without needing extra thermal headroom. The overload trip class is adjustable between CLASS 10 and CLASS 20, so you can match the thermal protection to the motor start profile: CLASS 10 for fast-starting loads, CLASS 20 for higher-inertia equipment like centrifuges.

Mounting and wiring in a packed panel

Rated for continuous operation across -20 to +60 °C ambient, pollution degree 3, so it holds up in unwashed industrial enclosures near drives or transformers.

Frequently asked questions

Where can I buy the 3RA6120-1CB34 and check availability?

This part is available to order through independent distribution. Submit an RFQ for current pricing and lead time; availability is confirmed at quote time.

MPN
3RA6120-1CB34