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Siemens 3RV2421-0AA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-0AA10 SIRIUS Circuit Breaker, 100 kA, Class

MPN3RV2421-0AA10
Active

Siemens SIRIUS transformer-protection circuit breaker, 3RV2421-0AA10, Size S0, Trip Class 10, 100 kA interrupting capacity at 400 V AC, screw and snap-on DIN rail mounting.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RV2421-0AA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-0AA10 — Electrical
ParameterValue
Rated operational current (Ie)0.16 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)5.5 W
Power loss, per pole (AC, hot)1.8 W
3RV2421-0AA10 — Protection & Tripping
ParameterValue
Overload release setting range0.11 ... 0.16 A
Instantaneous short-circuit trip current3.3 A
Trip classCLASS 10
Breaking capacity at 240 V (AC)100 kA
Breaking capacity at 400 V (AC)100 kA
Breaking capacity at 500 V (AC)100 kA
Breaking capacity at 690 V (AC)100 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V100 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2421-0AA10 — 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
3RV2421-0AA10 — 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
Conductor range, AWG (main contacts)2x (16 ... 12), 2x (14 ... 8)
3RV2421-0AA10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Mounting positionany
3RV2421-0AA10 — 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
3RV2421-0AA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

Transformer-Protection Circuit Breaker, Size S0

The Siemens 3RV2421-0AA10 is a SIRIUS-brand circuit breaker designed specifically for transformer protection.

The 3RV2421-0AA10 is the transformer-protection variant. If your panel was originally specced with a 3RV2011-0AA10 (a motor-protection breaker), the physical footprint and DIN rail mounting are identical, but the trip curve and overload class differ — the 3RV2421 is optimized for inrush-heavy transformer loads rather than motor starting. No rewiring needed for the swap, but verify the trip setting matches your transformer FLA.

Integration Notes

Screw-type terminals on the main circuit accept 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²) solid or stranded. Terminal screw M4. Pozidriv #2 tip. Mounting position any. That zero forward clearance means it can sit flush against a gland plate or back panel without derating. Rated operational voltage 20 to 690 V. Mechanical switching frequency at AC-3 maximum 15 operations per hour — fine for transformer primary switching; not a high-cycle application breaker.

Frequently asked questions

Where can I buy the 3RV2421-0AA10 and get a price?

This part is sourced to order against an RFQ through independent industrial automation distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

Will the 3RV2421-0AA10 drop into a panel specced for a 3RV2011-0AA10 without rewiring?

Yes, the physical footprint and DIN rail mounting are identical — both are Size S0, 45 mm wide, same terminal layout. The difference is application: the 3RV2421 is a transformer-protection breaker with Class 10 trip; the 3RV2011 is a motor-protection breaker. No rewiring needed, but verify the trip setting matches your transformer FLA.

What is the interrupting capacity of the 3RV2421-0AA10 at 400 V?

100 kA at 400 V AC. That's the same rating at 240 V, 500 V, and 690 V AC — a flat 100 kA SCCR across the common industrial voltages.

What compliance documentation does Siemens provide for this breaker?

As a standard Siemens SIRIUS catalog item, the 3RV2421-0AA10 is typically covered by CE, UL, CSA, and CCC certifications, plus RoHS and REACH declarations. Specific documentation (declarations of conformity, UL file numbers) is provided with the shipment or available on request.

MPN
3RV2421-0AA10