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Siemens 3RV2021-4BA25 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4BA25 SIRIUS Motor Protection Circuit Breake

MPN3RV2021-4BA25
Active

Siemens SIRIUS 3RV2021-4BA25 motor protection circuit breaker, Trip Class 10, 45 mm wide, 25 kA breaking capacity at 400 V, screw and snap-on DIN rail mounting, spring-loaded terminals.

$48.26Ref. price · indicative, final on quote
Siemens 3RV2021-4BA25 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

3RV2021-4BA25 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4BA25 — Electrical
ParameterValue
Rated operational current (Ie)20 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)10.5 W
Power loss, per pole (AC, hot)3.5 W
3RV2021-4BA25 — Protection & Tripping
ParameterValue
Overload release setting range13 ... 20 A
Instantaneous short-circuit trip current260 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
3RV2021-4BA25 — 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
3RV2021-4BA25 — Connections
ParameterValue
Main-circuit terminal typespring-loaded terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded with ferrule2x (0.5 ... 1.5 mm²)
Conductor range, AWG (main contacts)2x (18 ... 8)
3RV2021-4BA25 — 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
3RV2021-4BA25 — 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
3RV2021-4BA25 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

Breaking capacity at 400 V is 25 kA — sufficient for most industrial panel bus feeds up to that fault level without requiring an upstream current-limiting fuse or backup MCCB. The 45 mm width (three 15 mm modular spaces) fits standard panel layout grids. Spring-loaded terminals on the main circuit accept 2× (0.5 to 2.5 mm²) solid or stranded — no screw torque to verify, which speeds wiring on repetitive builds.

Compliance documentation for this series includes CE marking, UL/CSA recognition, and RoHS/REACH declarations. Certificates are available on request.

Frequently asked questions

Will 3RV2021-4BA25 drop into a panel specified around 3RV2021-4CA25 without rewiring?

Yes, the 3RV2021-4BA25 shares the same 45 mm width, DIN rail mounting, and spring-loaded terminal layout as the 3RV2021-4CA25. The functional difference is the trip current range — verify your motor FLA falls within the 3RV2021-4BA25's adjustment range before substituting.

What is 3RV2021-4BA25's listed depth?

The listed depth is 97 mm.

MPN
3RV2021-4BA25