Skip to main content
Log in
Siemens 3RV2421-4AA10 — Motor Protection Circuit Breakers (MPCB)

Siemens SIRIUS 3RV2421-4AA10 Circuit Breaker, 25 kA at 400 V

MPN3RV2421-4AA10
Active

Siemens SIRIUS circuit breaker, order code 3RV2421-4AA10, for transformer protection, 25 kA breaking capacity at 400 V, Class 10 trip, screw and snap-on mounting onto 35 mm DIN rail.

$41.91Ref. price · indicative, final on quote
Siemens 3RV2421-4AA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2421-4AA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-4AA10 — Electrical
ParameterValue
Rated operational current (Ie)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)9.25 W
Power loss, per pole (AC, hot)3.1 W
3RV2421-4AA10 — Protection & Tripping
ParameterValue
Overload release setting range10 ... 16 A
Instantaneous short-circuit trip current286 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
3RV2421-4AA10 — 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
3RV2421-4AA10 — 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)
3RV2421-4AA10 — 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
3RV2421-4AA10 — 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
3RV2421-4AA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

At 230 V it jumps to 100 kA, so it handles high-fault panels on the low-voltage side. The gL/gG fuse coordination limits are 63 A at 400 V, 50 A at 500 V, and 40 A at 690 V; if you're coordinating with upstream fuses, those are the max values for selective isolation.

Terminals and wiring

Screw-type terminals on the main circuit accept 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²) solid or stranded copper. M4 terminal screws — torque them to the standard panel value for that size. No ground-fault detection onboard, but it does include phase-failure detection, so if one phase drops out on a three-phase transformer, the breaker trips.

Frequently asked questions

Where can I buy 3RV2421-4AA10 and how do I get a price?

We source this part to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ through the site.

What is the breaking capacity of 3RV2421-4AA10 at 400 V?

25 kA at 400 V, which is the rated short-circuit breaking capacity for this breaker.

What compliance documentation does Siemens provide for 3RV2421-4AA10?

Standard Siemens SIRIUS documentation includes RoHS and REACH declarations; the device is designed to meet IEC 60947-2 and related standards. Specific certificates (UL, CSA, etc.) are available from the manufacturer upon request.

MPN
3RV2421-4AA10