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Siemens 3RV2021-4AA20 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4AA20 SIRIUS Motor Protection Circuit Breake

MPN3RV2021-4AA20
Active

Siemens SIRIUS motor protection circuit breaker, 3RV2021-4AA20, Trip Class 10, 100 kA breaking capacity at 240 V AC, screw and snap-on mounting on 35 mm DIN rail, spring-loaded terminals.

$40.64Ref. price · indicative, final on quote
Siemens 3RV2021-4AA20 datasheet (PDF)
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

3RV2021-4AA20 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4AA20 — Electrical
ParameterValue
Rated operational current (Ie)16 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)9.25 W
Power loss, per pole (AC, hot)3.1 W
3RV2021-4AA20 — Protection & Tripping
ParameterValue
Overload release setting range10 ... 16 A
Instantaneous short-circuit trip current208 A
Trip classCLASS 10
Breaking capacity at 240 V (AC)100 kA
Breaking capacity at 400 V (AC)55 kA
Breaking capacity at 500 V (AC)10 kA
Breaking capacity at 690 V (AC)4 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
3RV2021-4AA20 — 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
3RV2021-4AA20 — Connections
ParameterValue
Main-circuit terminal typespring-loaded terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (1 ... 10 mm²)
Conductor cross-section, finely stranded with ferrule2x (1 ... 6 mm²)
Conductor range, AWG (main contacts)2x (18 ... 8)
3RV2021-4AA20 — Mechanical
ParameterValue
Height119 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting positionany
3RV2021-4AA20 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Relative humidity (operation)10 ... 95 %
Max. installation altitude2 000 m
3RV2021-4AA20 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

It mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, and the main circuit connects through spring-loaded terminals (accepting 2× 1–10 mm² solid or stranded).

Breaking capacity — what the ratings mean

Breaking capacity varies with system voltage: 100 kA at 240 V AC, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. For backup fuse coordination, the spec lists gL/gG fuse ratings: 63 A at 400 V, 50 A at 500 V, and 40 A at 690 V. These are the maximum fuse sizes that still allow the breaker to achieve its full interrupting rating — important for selectivity studies.

Panel integration and clearances

Dimensions: 45 mm wide, 119 mm high, 97 mm deep. Required clearances: 50 mm upwards and downwards, 30 mm to the side, 0 mm forwards and backwards.

MPN
3RV2021-4AA20