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Siemens 3RV1421-0AA15 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1421-0AA15 SIRIUS Circuit Breaker, Transformer Pr

MPN3RV1421-0AA15

Siemens SIRIUS circuit breaker, 3RV1421-0AA15, for transformer protection, 0.16 A rated continuous current, 100 kA breaking capacity at 400 V AC, CLASS 10 trip, phase failure detection, screw terminals, 45 mm wide.

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

Specifications

3RV1421-0AA15 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1421-0AA15 — 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
3RV1421-0AA15 — Protection & Tripping
ParameterValue
Overload release setting range0.11 ... 0.16 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
3RV1421-0AA15 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1421-0AA15 — 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)
3RV1421-0AA15 — 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
3RV1421-0AA15 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1421-0AA15 — Specifications
ParameterValue
Design Of The Productfor transformer protection

Product details

The CLASS 10 trip characteristic matches the inrush profile of small control transformers, so nuisance tripping on energization is minimized.

The 0.16 A continuous rating sets the maximum steady-state load without thermal trip. For a three-phase control transformer feeding a rectifier or multiple single-phase loads, this is a practical safeguard that a standard MCB won't give you. In a panel with a large upstream transformer or a stiff utility feed, that SCCR headroom keeps the breaker from becoming the weak link in the coordination study. Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 230 V, 0.15 A at 60 V. These are the switching limits for the built-in auxiliary contacts — use them to signal the breaker's state to a PLC or annunciator. The 24 V rating covers the common control voltage in most panels; the 230 V rating lets you drive an indicator lamp directly without an interposing relay. Power loss of 5.5 W in hot operating state at AC.

The 45 mm width occupies one standard modular unit, so it fits alongside MCBs and contactors in a conventional DIN-rail layout. Dimensions: 45 mm wide, 97 mm high, 96 mm deep. The 96 mm depth is the front-to-back footprint — verify clearance behind the DIN rail, especially if the panel has a back plate or a rear wiring duct. Wire cross-sections: solid 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²); stranded 2x (1...2.5 mm²) and 2x (2.5...6 mm²). AWG for main contacts: 2x (14...10). These cover the typical control wiring sizes — no need for ferrule adapters on stranded wire up to 2.5 mm².

The storage range exceeds the operating range — that's the handling limit, not the running limit. Shock resistance 25g / 11 ms, adequate for most industrial machinery and conveyor applications. Substance prohibitance date 01.05.2012 — this is the RoHS compliance cutoff. The part meets the RoHS directive as of that date, so it's acceptable for EU-market equipment and for customers with RoHS procurement requirements.

Frequently asked questions

What is 3RV1421-0AA15's listed depth?

The depth is 96 mm, which is the front-to-back footprint on the DIN rail.

What wire sizes does 3RV1421-0AA15 accept?

Solid wire: 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²). Stranded wire: 2x (1...2.5 mm²) and 2x (2.5...6 mm²). AWG for main contacts: 2x (14...10).

What compliance documentation does this brand provide for 3RV1421-0AA15?

The part meets RoHS requirements with a substance prohibitance date of 01.05.2012. Standard Siemens documentation includes RoHS and REACH declarations; UL and IEC certifications are typical for the SIRIUS product family.

MPN
3RV1421-0AA15