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Siemens 3RA6120-1BB32 — Motor Starters

Siemens 3RA6120-1BB32 SIRIUS Compact Starter, 53 kA at 400 V

MPN3RA6120-1BB32
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Siemens SIRIUS 3RA6120-1BB32 compact direct starter, 370 W at 400 V, 53 kA breaking capacity, adjustable Trip Class 10/20, screw-type terminals, DIN rail mount.

$612.07Ref. price · indicative, final on quote
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

3RA6120-1BB32 — Identification
ParameterValue
Product designationcompact starter
Main circuit poles3
BrandSIRIUS
Product design / constructiondirect starter
Reference designation (IEC 81346-2)Q
3RA6120-1BB32 — Ratings & Performance
ParameterValue
Rated motor power at 400 V370 W
Rated motor power at 460/480 V (hp)0.5 hp
Rated motor power at 575/600 V (hp)0.5 hp
Rated current at 480 V1.25 A
Rated current at 600 V1.25 A
Rated impulse withstand voltage (Uimp)6 000 V
3RA6120-1BB32 — Protection & Tripping
ParameterValue
Trip classCLASS 10 and 20 adjustable
Short-circuit protectionYes
Overload release setting range (current)0.32 ... 1.25 A
Duty / utilization type (IEC 60947-6-2)continous operation according to IEC 60947-6-2
3RA6120-1BB32 — Contacts & Control
ParameterValue
Rated voltage range at 50 Hz24 V
Auxiliary contacts, NO1
Auxiliary contacts, NC1
Auxiliary switch extensionYes
3RA6120-1BB32 — Mechanical & Connection
ParameterValue
Mounting / fastening methodscrew and snap-on mounting
Mounting positionany
Width45 mm
Height170 mm
Depth165 mm
3RA6120-1BB32 — Environmental
ParameterValue
Operating temperature range-20 ... +60 °C
Storage temperature range-55 ... +80 °C
Transport temperature range-55 ... +80 °C
Pollution degree3

Product details

Compact Starter for Motor Protection and Control

The adjustable Trip Class (10 or 20) lets you match the thermal overload curve to the motor start profile: Class 10 for short acceleration times like pumps, Class 20 for high-inertia loads like fans or conveyors.

Screw-type terminals on the main circuit accept 0.5 to 4 mm² solid or stranded, or 2x 0.5 to 2.5 mm² — typical for motor branch circuits up to 370 W at 400 V. Strip length for screw terminals is standard; no special tooling required. Coil supply is 24 V AC/DC (24 V at 50/60 Hz, 24 V DC), with a 2.8 W AC / 2.9 W DC power draw — compatible with standard 24 V control transformers or power supplies. Two LEDs indicate status.

Vibration resistance up to 20 m/s² at 5.8–500 Hz and shock resistance of 60 m/s² (6g) per 3 shocks in all axes means it holds up on a machine frame or conveyor line. Degree of Pollution 3 (conductive or dry non-conductive pollution) — typical for industrial control panels not in clean-room environments. Any mounting position allowed.

Frequently asked questions

What wire sizes does the screw terminal accept?

The main circuit terminals accept 0.5 to 4 mm² solid or stranded wire, or 2x 0.5 to 2.5 mm². This covers typical motor branch circuit wiring for a 370 W load.

Can this starter be mounted in any orientation?

Yes, any mounting position is allowed, though the recommended orientation is vertical on horizontal DIN rail. The snap-on mounting is standard for DIN rail enclosures.

MPN
3RA6120-1BB32