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Siemens 3RV2021-4FA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4FA10 SIRIUS MPCB, Trip Class 10, 10 kA

MPN3RV2021-4FA10
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Siemens SIRIUS 3RV2021-4FA10 motor protection circuit breaker, Trip Class 10, 45 mm wide, 10 kA interrupting capacity at 400 V AC.

$195.39 – $508.42Ref. price · indicative, final on quote
Siemens 3RV2021-4FA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2021-4FA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4FA10 — Electrical
ParameterValue
Rated operational current (Ie)40 A
Rated voltage20 ... 690 V
Rated voltage, AC-3 (max.)690 V
Rated frequency50 ... 60 Hz
Rated insulation voltage (Ui), pollution degree 3690 V
Rated impulse withstand voltage (Uimp)6 kV
Number of poles3
Power loss (AC, hot)16.25 W
Power loss, per pole (AC, hot)5.4 W
3RV2021-4FA10 — Protection & Tripping
ParameterValue
Overload release setting range34 ... 40 A
Instantaneous short-circuit trip current480 A
Trip classCLASS 10
Breaking capacity at 240 V (AC)100 kA
Breaking capacity at 400 V (AC)20 kA
Breaking capacity at 500 V (AC)6 kA
Breaking capacity at 690 V (AC)3 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V2 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2021-4FA10 — Endurance & Switching
ParameterValue
Endurance, main contacts (typ.)100 000
Endurance, auxiliary contacts (typ.)100 000
Switching frequency, AC-3 (max.)15 1/h
Auxiliary CO (changeover) contacts0
3RV2021-4FA10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)
Conductor cross-section, finely stranded with ferrule2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²
3RV2021-4FA10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting positionany
3RV2021-4FA10 — Environmental
ParameterValue
Operating temperature-20 ... +40 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Relative humidity (operation)10 ... 95 %
Max. installation altitude2 000 m
3RV2021-4FA10 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

Trip Class 10 and interrupting capacity

DIN rail fit and wiring

Any mounting position is permitted, so it fits in tight enclosures where the rail is vertical or inverted. Main circuit terminals accept solid or stranded copper: 2×(1…2.5 mm²) or 2×(2.5…10 mm²) per clamp. The M4 screw terminals are the same across the SIRIUS 3RV2 family, so a panel builder can standardise on one torque driver for the whole lineup. Clearance dimensions: 70 mm upwards and downwards, 30 mm to the side, 0 mm forwards — the breaker can sit flush against a panel door or adjacent component without derating.

Frequently asked questions

Where can I buy the Siemens 3RV2021-4FA10?

The 3RV2021-4FA10 is sourced to order against an RFQ through independent distribution.

What is the trip class of the 3RV2021-4FA10?

Trip Class 10, meaning it trips within 10 seconds at 7.2× the thermal setting. This is the standard class for general-purpose motor starting.

MPN
3RV2021-4FA10