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Siemens 3RV2421-1GA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-1GA10 SIRIUS Circuit Breaker, Transformer Pr

MPN3RV2421-1GA10
Active

Siemens SIRIUS circuit breaker, 3RV2421-1GA10, for transformer protection, 100 kA breaking capacity at 400 V, Trip Class 10, 45 mm wide, screw and snap-on 35 mm DIN rail mounting.

$38.10Ref. price · indicative, final on quote
Siemens 3RV2421-1GA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2421-1GA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-1GA10 — Electrical
ParameterValue
Rated operational current (Ie)6.3 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
3RV2421-1GA10 — Protection & Tripping
ParameterValue
Overload release setting range4.5 ... 6.3 A
Instantaneous short-circuit trip current130 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)6 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V4 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2421-1GA10 — 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
3RV2421-1GA10 — 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
3RV2421-1GA10 — 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
3RV2421-1GA10 — 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
3RV2421-1GA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

Transformer protection breaker with 100 kA interrupting capacity

There is no ground fault detection, so pair this with a residual-current device if ground-fault protection is required.

DIN-rail fit and clearance envelope

That 50 mm vertical gap is the one that catches panel builders — skimp on it and you lose the arc-chamber venting path. Terminals accept 2x (1…2.5 mm²) or 2x (2.5…10 mm²) solid or stranded copper, with M4 screw-type terminals for the main circuit.

Fuse backup coordination

When the prospective fault current exceeds the breaker's interrupting capacity at your system voltage, the 3RV2421-1GA10 requires upstream gL/gG fuses: 50 A at 400 V, 40 A at 500 V, 35 A at 690 V. These are the maximum fuse ratings for backup protection — do not oversize them or the coordination fails.

Frequently asked questions

What is 3RV2421-1GA10's listed depth?

The depth is 97 mm, with a width of 45 mm and height of 97 mm.

Will 3RV2421-1GA10 drop into a panel specified around 3RV2021-1FA15 without rewiring?

Both are 45 mm wide SIRIUS breakers on 35 mm DIN rail, so the footprint is the same. However, 3RV2421-1GA10 is a transformer-protection design while 3RV2021-1FA15 is a motor-protection design — the trip curves and thermal settings differ. Verify the protection coordination before swapping.

MPN
3RV2421-1GA10