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Siemens 3RV1421-1GA15-0BA0 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-1GA15-0BA0 SIRIUS Circuit Breaker, 6.3 A, Cl

MPN3RV1421-1GA15-0BA0

Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-1GA15-0BA0, 6.3 A continuous, Class 10 trip, 100 kA breaking capacity at 400 V AC, screw terminals, IP20 front.

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

Specifications

3RV1421-1GA15-0BA0 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-1GA15-0BA0 — 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
3RV1421-1GA15-0BA0 — Protection & Tripping
ParameterValue
Overload release setting range4.5 ... 6.3 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
3RV1421-1GA15-0BA0 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1421-1GA15-0BA0 — 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)
Conductor range, AWG (main contacts)2x (14 ... 10)
3RV1421-1GA15-0BA0 — 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
3RV1421-1GA15-0BA0 — Environmental
ParameterValue
Operating temperature-50 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1421-1GA15-0BA0 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

Rated 6.3 A continuous with Class 10 trip characteristics, it's the go-to for protecting control transformers on DIN-rail panels.

Breaking capacity — the real number that matters

At 690 V AC the rating drops to 6 kA, which is still adequate for most secondary-side transformer protection.

Main and auxiliary/control circuits both use screw-type terminals. Solid wire accepts 2x (0.5 … 1.5 mm²) and 2x (0.75 … 2.5 mm²); stranded accepts 2x (1 … 2.5 mm²) and 2x (2.5 … 6 mm²). AWG for main contacts: 2x (14 … 10). The auxiliary switch is transverse design and the product extension for auxiliary switch is available, so you can add aux contacts without removing the breaker.

Frequently asked questions

How do I get current pricing and availability for 3RV1421-1GA15-0BA0?

Submit an RFQ through this listing. We source through independent distribution and confirm pricing and availability at quote time — no stock figures on the page, but we can turn a quote fast.

What is the closest functional second-source for 3RV1421-1GA15-0BA0?

The 3RV1011-0GA10 is a similar SIRIUS motor-protective circuit breaker, but it's designed for motor protection (not transformer protection) and has a different trip curve. For transformer protection, stick with this 3RV1421-1GA15-0BA0 — the thermal characteristics are matched to transformer inrush.

Does 3RV1421-1GA15-0BA0 drop into a panel built for 3RV1011-0GA10?

Both mount on 35 mm DIN rail per DIN EN 50022 and share the same 45 mm width and 97 mm height, so the footprint is compatible. But the 3RV1421 is 96 mm deep vs the 3RV1011's typical depth — check clearance if the panel is tight. Also verify the trip curve: this is Class 10 for transformer duty, not motor protection.

MPN
3RV1421-1GA15-0BA0