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Siemens 3RV1421-1EA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-1EA10 SIRIUS Circuit Breaker, 4 A, 100 kA at

MPN3RV1421-1EA10

Siemens SIRIUS 3RV1421-1EA10, circuit breaker for transformer protection, 3-pole, 4 A, 100 kA at 400 V AC, Trip Class 10, screw terminals, DIN rail mount.

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

Specifications

3RV1421-1EA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-1EA10 — 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
3RV1421-1EA10 — Protection & Tripping
ParameterValue
Overload release setting range2.8 ... 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)6 kA
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1421-1EA10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1421-1EA10 — 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)
3RV1421-1EA10 — 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
3RV1421-1EA10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1421-1EA10 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

Transformer-protection circuit breaker, 4 A, 100 kA

The 3-pole unit carries a Trip Class 10 characteristic, meaning it trips within 10 seconds at 7.2× rated current — fast enough to protect a transformer winding from sustained overload while riding through inrush.

Main and auxiliary/control circuits both use screw-type terminals; solid wire accepted is 2× (1 … 2.5 mm²) and 2× (2.5 … 6 mm²), with the same ranges for stranded and finely stranded with ferrule. AWG equivalents are 2× (14 … 10). Backwards clearance is 0 mm — no extra space needed behind the rail.

Breaking capacity across voltage

Breaking capacity is 100 kA at 240 V AC, 100 kA at 400 V AC, 100 kA at 500 V AC, and 6 kA at 690 V AC. For most 400 V distribution panels the full 100 kA is available, which covers high-fault installations downstream of large transformers.

Frequently asked questions

Does 3RV1421-1EA10 include phase failure detection?

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

What compliance documentation does Siemens provide for 3RV1421-1EA10?

RoHS compliance is confirmed with a substance prohibition date of 01.05.2012. The part carries IP20 finger-safe protection on the front.

MPN
3RV1421-1EA10