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Siemens 3RV2421-0CA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-0CA10 SIRIUS Circuit Breaker, Transformer Pr

MPN3RV2421-0CA10
Active

Siemens SIRIUS circuit breaker, 3RV2421-0CA10, Size S0, for transformer protection, 100 kA SCCR at 400 V, Trip Class 10, 45 mm wide.

Siemens 3RV2421-0CA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2421-0CA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-0CA10 — Electrical
ParameterValue
Rated operational current (Ie)0.25 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
3RV2421-0CA10 — Protection & Tripping
ParameterValue
Overload release setting range0.18 ... 0.25 A
Instantaneous short-circuit trip current5.2 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
3RV2421-0CA10 — 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
3RV2421-0CA10 — 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)
3RV2421-0CA10 — 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
3RV2421-0CA10 — 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
3RV2421-0CA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

Transformer-protection circuit breaker, Size S0

It carries a 100 kA short-circuit breaking capacity at 400 V AC (also at 240 V, 500 V, and 690 V AC), which means it can safely interrupt faults up to that level without cascading upstream. Trip Class 10 means the bimetal releases within 10 seconds at 7.2× the thermal setting — standard for protecting transformers against sustained overloads without nuisance tripping on inrush.

Size S0 frame, 45 mm wide, 97 mm deep, 97 mm tall. The 45 mm width means it occupies one standard modular slot; plan for 50 mm clearance above and below for wiring access, and 30 mm to the sides for heat dissipation. Screw-type terminals on the main circuit accept 2×(1…2.5 mm²) or 2×(2.5…10 mm²) solid or stranded copper.

Frequently asked questions

What is the closest functional second-source for 3RV2421-0CA10?

The 3RV2011-0AA10 is a SIRIUS Size S0 circuit breaker but it is a motor-protective breaker, not a transformer-protection design. The 3RV2421-0CA10 has a dedicated transformer-protection characteristic and a 100 kA SCCR across 240–690 V; the 3RV2011-0AA10 has different trip curves and lower interrupting ratings. They share the same 45 mm footprint and DIN-rail mount, so a panel swap is physically possible, but the protection coordination will differ — verify the trip curve matches your transformer's inrush before substituting.

Where can I buy 3RV2421-0CA10 and how is it quoted?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send an RFQ with your target quantity and delivery window.

What compliance documentation does Siemens provide for 3RV2421-0CA10?

Siemens SIRIUS products typically carry CE, UL, CSA, and CCC certifications, plus RoHS and REACH declarations. The specific approvals for this order code should be verified on the manufacturer's declaration of conformity; the evidence does not list individual cert marks.

MPN
3RV2421-0CA10