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Siemens 3RV2421-1CA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-1CA10 SIRIUS Circuit Breaker, 100 kA at 400

MPN3RV2421-1CA10
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Siemens SIRIUS circuit breaker, 3RV2421-1CA10, for transformer protection, 45 mm wide, 100 kA breaking capacity at 400 V, Class 10 trip.

Siemens 3RV2421-1CA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2421-1CA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-1CA10 — Electrical
ParameterValue
Rated operational current (Ie)2.5 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
3RV2421-1CA10 — Protection & Tripping
ParameterValue
Overload release setting range1.8 ... 2.5 A
Instantaneous short-circuit trip current52 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)10 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V10 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2421-1CA10 — 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
3RV2421-1CA10 — 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)
3RV2421-1CA10 — 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
3RV2421-1CA10 — 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
3RV2421-1CA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

Transformer-protection breaker for DIN-rail panels

The Siemens 3RV2421-1CA10 is a SIRIUS circuit breaker designed specifically for transformer protection, with a rated breaking capacity of 100 kA at 400 V and 100 kA at 500 V.

The gL/gG fuse backup ratings are 25 A at 400 V and 500 V, and 20 A at 690 V.

Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side, 0 mm forwards and backwards — so it can sit flush against a backplate or enclosure wall. Main contact terminals accept M4 screws, wire range 2x 1…2.5 mm² or 2x 2.5…10 mm² solid or stranded.

Frequently asked questions

How do I get current pricing and availability for 3RV2421-1CA10?

Submit an RFQ through this listing. Availability and current pricing are confirmed at quote time through independent distribution channels.

What is 3RV2421-1CA10's listed depth?

The listed depth is 97 mm.

What is 3RV2421-1CA10's listed width?

The listed width is 45 mm.

Will 3RV2421-1CA10 drop into a panel specified around 3RV1011-0GA10 without rewiring?

The 3RV2421-1CA10 uses the same 45 mm width and 35 mm DIN rail mounting as the 3RV1011 series, but terminal layout and wire range (2x 1…10 mm²,) should be verified against the existing panel wiring before assuming a drop-in replacement.

MPN
3RV2421-1CA10