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Siemens 3RV2421-0DA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-0DA10 SIRIUS Circuit Breaker, 100 kA, Class

MPN3RV2421-0DA10
Active

Siemens SIRIUS circuit breaker for transformer protection, 3RV2421-0DA10, size S0, 100 kA breaking capacity at 400 V AC, Class 10 trip, phase failure detection, screw and snap-on DIN rail mounting.

Siemens 3RV2421-0DA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2421-0DA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-0DA10 — Electrical
ParameterValue
Rated operational current (Ie)0.32 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
3RV2421-0DA10 — Protection & Tripping
ParameterValue
Overload release setting range0.22 ... 0.32 A
Instantaneous short-circuit trip current6.5 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
3RV2421-0DA10 — 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
3RV2421-0DA10 — 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)
3RV2421-0DA10 — 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
3RV2421-0DA10 — 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
3RV2421-0DA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

The Siemens 3RV2421-0DA10 is a SIRIUS circuit breaker specifically designed for transformer protection, size S0.

Ground fault detection is not included; if that's required, a separate residual-current device must be added downstream. The temperature compensation is active across the same -20 to +60 °C band, so the trip curve stays accurate in a warm enclosure.

Mounting position is any orientation. Clearance requirements: 50 mm upward and downward, 30 mm to the side, zero forward or backward — so it can sit flush against a backplate. Main circuit terminals accept 2× (1 to 2.5 mm²) or 2× (2.5 to 10 mm²) solid or stranded wire, screw-type with M4 screws. Screwdriver shaft diameter 5 to 6 mm, Pozidriv size 2 tip.

Frequently asked questions

Does 3RV2421-0DA10 detect ground faults?

No, ground fault detection is not built in. If ground-fault protection is needed, a separate residual-current device must be added downstream.

MPN
3RV2421-0DA10