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Siemens 3RV2021-4NA40 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4NA40 SIRIUS Motor-Protective Circuit Breake

MPN3RV2021-4NA40

Siemens SIRIUS 3RV2021-4NA40 motor-protective circuit breaker, Class 10 trip, 45 mm width, screw and snap-on DIN-rail mount, 25 kA at 400 V.

Siemens 3RV2021-4NA40 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

3RV2021-4NA40 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4NA40 — Electrical
ParameterValue
Rated operational current (Ie)28 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)13.25 W
Power loss, per pole (AC, hot)4.4 W
3RV2021-4NA40 — Protection & Tripping
ParameterValue
Overload release setting range23 ... 28 A
Instantaneous short-circuit trip current364 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
3RV2021-4NA40 — 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
3RV2021-4NA40 — Connections
ParameterValue
Main-circuit terminal typeRing cable lug connection
Main-circuit connector arrangementTop and bottom
3RV2021-4NA40 — 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
3RV2021-4NA40 — 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
3RV2021-4NA40 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

Motor-protective circuit breaker for 400 V panels

At 480 V the rated current is 28 A; at 500 V the breaking capacity drops to 5 kA, and at 690 V to 2 kA. That derating curve matters when you're specifying for a 480 V line or a 690 V drive input.

Clearance: 50 mm above and below, 30 mm to the side, 0 mm forward or backward — so you can butt it against the backplane or a busbar without extra spacing. Main-circuit connection uses ring cable lugs on M4 screws — no spring-cage option here. Phase-failure detection is built in; ground-fault detection is not, so if you need GF protection you'll add an external module or a separate ground-fault relay.

No EOL notice or successor has been issued for this order code.

Frequently asked questions

Will 3RV2021-4NA40 drop into a panel that was specified around 3RV2021-4NA25 without rewiring?

Both are 45 mm wide SIRIUS motor-protective circuit breakers with the same DIN-rail mounting and M4 ring-lug connections, so the mechanical and electrical footprint is identical. The difference is in the trip setting and breaking capacity — check your specific overload curve and fault current requirements before swapping.

What compliance documentation does this brand provide for 3RV2021-4NA40 (RoHS, REACH, UL, IEC)?

Siemens SIRIUS products typically carry UL, CSA, CE, and IEC certifications. Specific documentation (RoHS, REACH, UL file number) is available from the manufacturer's support portal or upon request with the RFQ.

MPN
3RV2021-4NA40