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Siemens 3RV2421-0BA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-0BA10 SIRIUS Circuit Breaker, 100 kA at 400

MPN3RV2421-0BA10
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Siemens SIRIUS circuit breaker for transformer protection, 3RV2421-0BA10, Size S0, 100 kA breaking capacity at 400 V AC, Trip Class 10, screw and snap-on DIN rail mounting.

Siemens 3RV2421-0BA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2421-0BA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-0BA10 — Electrical
ParameterValue
Rated operational current (Ie)0.2 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
3RV2421-0BA10 — Protection & Tripping
ParameterValue
Overload release setting range0.14 ... 0.2 A
Instantaneous short-circuit trip current4.2 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
3RV2421-0BA10 — 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
3RV2421-0BA10 — 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)
3RV2421-0BA10 — 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
3RV2421-0BA10 — 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
3RV2421-0BA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

The Siemens 3RV2421-0BA10 is a SIRIUS circuit breaker specifically designed for transformer protection — not a general-purpose motor-protective breaker. That means its trip curve is shaped to handle the inrush of a transformer without nuisance tripping, while still providing short-circuit and overload protection for the transformer and downstream wiring. Rated breaking capacity is 100 kA at 400 V AC (also at 240 V, 500 V, and 690 V AC), so it can safely interrupt fault currents up to that level without cascading upstream — a key spec for SCCR coordination in a panel.

Clearance: 50 mm above and below, 30 mm at the sides, 0 mm forward or backward — so it can be packed tight against the back panel or enclosure door. Main circuit connections are screw-type terminals accepting 2× (1 to 2.5 mm²) or 2× (2.5 to 10 mm²) solid or stranded copper. Terminal screws are M4, requiring a Pozidriv size 2 tip or a 5–6 mm diameter screwdriver shaft.

Frequently asked questions

What is the breaking capacity of 3RV2421-0BA10 at 400 V?

100 kA at 400 V AC, and the same rating applies at 240 V, 500 V, and 690 V AC.

Where can I buy 3RV2421-0BA10?

Sourced and quoted to order against an RFQ through independent distribution — availability and current pricing are confirmed at quote time.

What is the difference between 3RV2421-0BA10 and a standard motor-protective breaker?

This breaker is designed for transformer protection, so its trip curve handles transformer inrush without nuisance tripping, whereas a motor-protective breaker (like the 3RV2011 series) is optimized for motor starting characteristics.

MPN
3RV2421-0BA10