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Siemens 3RV2021-4FA15-ZX95 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4FA15-ZX95 SIRIUS Motor Protection Circuit B

MPN3RV2021-4FA15-ZX95
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Siemens SIRIUS motor protection circuit breaker, 3RV2021-4FA15-ZX95, Class 10 trip, 45 mm width, screw and snap-on 35 mm DIN rail mounting, for motor protection with phase failure detection.

Siemens 3RV2021-4FA15-ZX95 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

3RV2021-4FA15-ZX95 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4FA15-ZX95 — 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
3RV2021-4FA15-ZX95 — 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
3RV2021-4FA15-ZX95 — 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
3RV2021-4FA15-ZX95 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
3RV2021-4FA15-ZX95 — 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
3RV2021-4FA15-ZX95 — 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
3RV2021-4FA15-ZX95 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

At 230 V it's rated for 7.5 hp motor load; at 480 V and 600 V the continuous current rating is 40 A.

The 70 mm clearance required above and below (and 30 mm to the side) is for arc venting and thermal dissipation; pack it tighter and you lose the interrupting rating. Main circuit terminals are M4 screw-type, accepting 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded copper. Strip length isn't given in the spec, but standard practice for M4 screw terminals on this class is 8–10 mm. The auxiliary contact block (if used) shares the same terminal size.

Frequently asked questions

Will 3RV2021-4FA15-ZX95 drop into a panel specified for 3RV2021-4NA25?

Both are 45 mm wide SIRIUS motor protection breakers with the same DIN rail footprint and M4 screw terminals. The 4FA15 has a different trip curve and interrupting rating than the 4NA25, but the mechanical fit and wiring are identical — no rewiring needed for the swap.

MPN
3RV2021-4FA15-ZX95