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Siemens 3RV2021-4FA10-ZX95 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4FA10-ZX95 SIRIUS Motor Protection Circuit B

MPN3RV2021-4FA10-ZX95
Active

Siemens SIRIUS motor protection circuit breaker, 3RV2021-4FA10-ZX95, CLASS 10 trip, 10 kA SCCR at 400 V, 45 mm wide, screw and snap-on DIN rail mount.

Siemens 3RV2021-4FA10-ZX95 datasheet (PDF)
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jul 2026

Specifications

Identification

3RV2021-4FA10-ZX95 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0

Electrical

3RV2021-4FA10-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

Protection & Tripping

3RV2021-4FA10-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

Endurance & Switching

3RV2021-4FA10-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

Connections

3RV2021-4FA10-ZX95 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)
Conductor cross-section, finely stranded with ferrule2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²

Mechanical

3RV2021-4FA10-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

Environmental

3RV2021-4FA10-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

Specifications

3RV2021-4FA10-ZX95 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

The Siemens 3RV2021-4FA10-ZX95 is a SIRIUS motor-protection circuit breaker designed for motor loads. It combines a CLASS 10 thermal-magnetic trip curve with phase failure detection, so it catches a lost phase before the winding temperature climbs — the operator will find the bug at 2 a.m. if you skip that protection. Rated 10 kA SCCR at 400 V, it safely interrupts faults up to that level without cascading upstream.

Mounting and integration

Mounts on 35 mm DIN rail per DIN EN 60715 via screw and snap-on — no adapter plate needed. The 45 mm width and 97 mm cube keep it compact for a multi-motor panel. Terminal screws for main contacts are M4; wire range 2x 1–2.5 mm² solid or stranded, or 2x 2.5–10 mm². Clearance: 70 mm above and below, 30 mm at the sides, zero forward or backward. Mount in any position.

Frequently asked questions

Who supplies 3RV2021-4FA10-ZX95 and how is it quoted for volume purchases?

This part is sourced through independent distribution channels and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for volume or BOM-line requirements.

Will 3RV2021-4FA10-ZX95 drop into a panel specified around 3RV2023-4DA10 without rewiring?

Both share the SIRIUS 3RV2 family footprint — same 45 mm width and DIN-rail mounting — so the panel cutout and rail position are compatible. However, the 3RV2023-4DA10 carries different trip ratings and SCCR values; verify your motor FLA and available fault current against this unit's 10 kA at 400 V before swapping.

What is 3RV2021-4FA10-ZX95's listed depth?

Depth is 97 mm. Combined with 45 mm width and 97 mm height, it's a compact cube for DIN-rail panels.

What compliance documentation does this brand provide?

As a Siemens SIRIUS component, it typically carries UL, CSA, CE, and IEC certifications for motor-protection circuit breakers. Specific documentation (RoHS, REACH, UL, IEC) is available upon request with the RFQ.

MPN
3RV2021-4FA10-ZX95