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Siemens 3RV1421-1CA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-1CA10 SIRIUS Circuit Breaker, 2.5 A, Class 1

MPN3RV1421-1CA10

Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-1CA10, 2.5 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V AC, screw terminals, 45 mm wide.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RV1421-1CA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-1CA10 — Electrical
ParameterValue
Rated voltage690 V
Rated voltage, AC-3 (max.)690 V
Rated impulse withstand voltage (Uimp)6 000 V
Number of poles3
Power loss (AC, hot)7.25 W
Power loss, per pole (AC, hot)2.4 W
3RV1421-1CA10 — Protection & Tripping
ParameterValue
Overload release setting range1.8 ... 2.5 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)8 kA
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1421-1CA10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1421-1CA10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementfront side
Conductor cross-section, finely stranded with ferrule2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)
3RV1421-1CA10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022
Mounting positionany
3RV1421-1CA10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1421-1CA10 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

The Siemens SIRIUS 3RV1421-1CA10 is a 3-pole circuit breaker designed specifically for transformer protection, rated at 2.5 A continuous current with a Class 10 trip characteristic.

Breaking capacity and trip class

The 100 kA breaking capacity holds flat across 240 V, 400 V, and 500 V AC — that is a high-fault rating for a 45 mm wide device, meaning it can sit downstream of a large transformer without needing a current-limiting upstream breaker.

The 45 mm width (3 module spaces) and 97 mm height fit a standard distribution board layout. Mounting position is unrestricted. Finger-safe touch protection per IP20 on the front — safe for open-panel work as long as the busbars are shrouded.

Frequently asked questions

Where can I buy 3RV1421-1CA10?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.

What is the breaking capacity of 3RV1421-1CA10 at 400 V?

100 kA at 400 V AC, which holds flat from 240 V through 500 V. At 690 V AC the breaking capacity is 8 kA.

Will 3RV1421-1CA10 drop into a panel specified around 3RV2021-1FA15?

Both are 45 mm wide, 3-pole SIRIUS breakers on the same DIN-rail footprint, so the mechanical fit is identical. The 3RV2021-1FA15 is a higher-current variant (different trip range); verify the continuous current rating matches your load before swapping.

What compliance documentation does Siemens provide for 3RV1421-1CA10?

The part carries a substance prohibitance date of 05/01/2012, consistent with RoHS compliance. Phase-failure detection is built in; ground-fault detection is not included. Standard IEC/EN ratings apply for the SIRIUS product family.

MPN
3RV1421-1CA10