Skip to main content
Log in
Siemens 3RV1421-0CA15 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-0CA15 SIRIUS Circuit Breaker, 0.25 A, CLASS

MPN3RV1421-0CA15

Siemens SIRIUS 3RV1421-0CA15 circuit breaker for transformer protection, 0.25 A continuous rated current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw and snap-on mounting on 35 mm DIN rail.

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

Specifications

3RV1421-0CA15 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-0CA15 — 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)5.5 W
Power loss, per pole (AC, hot)1.8 W
3RV1421-0CA15 — Protection & Tripping
ParameterValue
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
Phase-failure detectionYes
Ground-fault detectionNo
3RV1421-0CA15 — Endurance & Switching
ParameterValue
Endurance, main contacts (typ.)100 000
Switching frequency, AC-3 (max.)15 1/h
3RV1421-0CA15 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementfront side
Conductor cross-section, finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
3RV1421-0CA15 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting positionany
3RV1421-0CA15 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
3RV1421-0CA15 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

Breaking capacity is a full 100 kA at 400 V AC (and at 240 V, 500 V, and 690 V AC as well), so this breaker can be placed on a panel main bus with high fault current without worrying about cascading failure upstream. Shock rated at 25g / 11 ms — holds up in a panel on a vibrating conveyor line.

Terminal and wiring

Main circuit connections are screw-type terminals. Solid wire accepts 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²); stranded accepts 2× (1 to 2.5 mm²) or 2× (2.5 to 6 mm²). No auxiliary contacts are fitted as standard (0 for auxiliary contacts), but an auxiliary switch with transverse design is available as an add-on.

Frequently asked questions

What is the breaking capacity of 3RV1421-0CA15?

100 kA at 240 V, 400 V, 500 V, and 690 V AC — the same across the full voltage range, so it handles high-fault-current panel buses without derating.

What is the trip class and continuous current rating?

CLASS 10 trip characteristic with a continuous rated current of 0.25 A. The CLASS 10 rating means it trips within 10 seconds at 7.2× rated current, suited for transformer inrush protection.

Where can I buy 3RV1421-0CA15 and how is it quoted?

This part is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time, no stock count or price is published here.

Does 3RV1421-0CA15 include phase failure detection?

Yes, phase failure detection is built in. Ground fault detection is not included.

MPN
3RV1421-0CA15