Skip to main content
Log in
Siemens 3RV2021-4BA25-ZW97 — Motor Protection Circuit Breakers (MPCB)

Siemens SIRIUS 3RV2021-4BA25-ZW97 Motor Protection Circuit B

MPN3RV2021-4BA25-ZW97
Active

Siemens SIRIUS, motor protection circuit breaker, 3RV2021-4BA25-ZW97, Class 10 trip, 25 kA breaking capacity at 400 V, phase failure detection, screw and snap-on mounting on 35 mm DIN rail.

Siemens 3RV2021-4BA25-ZW97 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-ZW97 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4BA25-ZW97 — 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-ZW97 — 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-ZW97 — 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-ZW97 — 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-ZW97 — Mechanical
ParameterValue
Height119 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Mounting positionany
3RV2021-4BA25-ZW97 — 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-ZW97 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

What this circuit breaker does on the line

This order code is listed as current production.

The 3RV2021-4BA25-ZW97 occupies 45 mm width on the DIN rail, which is roughly 2.5 modular units (18 mm per TE). Depth of 97 mm and height of 119 mm leave clearance for spring-loaded terminal wiring — the main circuit terminals accept 2 × (0.5 to 2.5 mm²) solid or stranded. Keep 50 mm free above and below the breaker for airflow and tool access; side clearance of 30 mm prevents arc flash between adjacent devices.

Frequently asked questions

Does the 3RV2021-4BA25-ZW97 detect phase failure?

Yes, phase failure detection is built in — it trips if one phase is lost, protecting the motor from single-phasing damage.

MPN
3RV2021-4BA25-ZW97