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Siemens 3RV1421-0EA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-0EA10 SIRIUS Circuit Breaker, 0.4 A, Class 1

MPN3RV1421-0EA10

Siemens SIRIUS 3RV1421-0EA10, circuit breaker for transformer protection, 3-pole, 0.4 A rated current, Trip Class 10, 100 kA breaking capacity at 400 V AC, screw terminals, 45 mm width, DIN EN 50022 rail mount.

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

Specifications

3RV1421-0EA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-0EA10 — 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
3RV1421-0EA10 — Protection & Tripping
ParameterValue
Overload release setting range0.28 ... 0.4 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
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1421-0EA10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1421-0EA10 — 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)
Conductor range, AWG (main contacts)2x (14 ... 10)
3RV1421-0EA10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Mounting positionany
3RV1421-0EA10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1421-0EA10 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

The Siemens 3RV1421-0EA10 is a SIRIUS circuit breaker specifically designed for transformer protection, rated at 0.4 A continuous current with Trip Class 10. It delivers 100 kA breaking capacity across 240 V, 400 V, 500 V, and 690 V AC, so it clears a hard fault on the primary side without upstream coordination issues.

Zero mm clearance required at the back or sides — the 96 mm depth and 97 mm height let it sit flush against the back panel. IP20 front protection means it's suited for enclosed panels only, not washdown zones.

Accepts solid or stranded conductors: 2x (1 … 2.5 mm²) and 2x (2.5 … 6 mm²), or AWG 2x (14 … 10). That covers most panel wiring from control transformers up to small power feeds. Finger-safe touch protection per the spec — no exposed live metal after termination.

Protection and environmental limits

Shock rated at 25g / 11 ms.

Frequently asked questions

What is the closest functional second-source to 3RV1421-0EA10?

The 3RV1011-0GA10 and 3RV1011-0HA10 are peer SIRIUS breakers in similar current ranges, but the 3RV1421-0EA10 is specifically designed for transformer protection with a 0.4 A rating and Class 10 trip — verify your overload curve and mounting footprint before substituting.

MPN
3RV1421-0EA10