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Siemens 3RV2421-1JA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-1JA10 SIRIUS Circuit Breaker, Transformer Pr

MPN3RV2421-1JA10
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Siemens SIRIUS circuit breaker, 3RV2421-1JA10, for transformer protection, 50 A at 400 V, Class 10 trip, screw and snap-on mounting on 35 mm DIN rail.

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

Specifications

3RV2421-1JA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-1JA10 — Electrical
ParameterValue
Rated operational current (Ie)10 A
Rated voltage20 ... 690 V
Rated voltage, AC-3 (max.)690 V
Rated frequency50 ... 60 Hz
Rated insulation voltage (Ui), pollution degree 3690 V
Rated impulse withstand voltage (Uimp)6 kV
Number of poles3
Power loss (AC, hot)9.25 W
Power loss, per pole (AC, hot)3.1 W
3RV2421-1JA10 — Protection & Tripping
ParameterValue
Overload release setting range7 ... 10 A
Instantaneous short-circuit trip current208 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)42 kA
Breaking capacity at 690 V (AC)6 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V4 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2421-1JA10 — Endurance & Switching
ParameterValue
Endurance, main contacts (typ.)100 000
Endurance, auxiliary contacts (typ.)100 000
Switching frequency, AC-3 (max.)15 1/h
Auxiliary CO (changeover) contacts0
3RV2421-1JA10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)
Conductor cross-section, finely stranded with ferrule2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²
Conductor range, AWG (main contacts)2x (16 ... 12), 2x (14 ... 8)
3RV2421-1JA10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Mounting positionany
3RV2421-1JA10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Relative humidity (operation)10 ... 95 %
Max. installation altitude2 000 m
3RV2421-1JA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

The headline number is the short-circuit breaking capacity: 100 kA at 400 V. The rated current for gL/gG fuses at 400 V is 50 A; at 500 V and 690 V it's 40 A. The breaker itself is rated for a 20...690 V range, covering common low-voltage networks.

Any mounting position — no derating for sideways or upside-down installs. Clearance: 50 mm above and below, 30 mm at the sides, zero forward or backward. That's tight enough for a crowded panel. Main circuit connections are screw-type terminals, M4 thread, accepting 2x (1...2.5 mm²) or 2x (2.5...10 mm²) solid or stranded.

Frequently asked questions

What is the short-circuit breaking capacity at 400 V?

100 kA at 400 V, which is high enough for most industrial main panel and transformer secondary applications.

What trip class is this breaker?

Class 10, designed to handle transformer inrush without nuisance tripping while still clearing faults quickly.

Does it detect phase failure?

Yes, phase failure detection is built in, protecting the transformer from single-phasing.

Where can I buy 3RV2421-1JA10 and how is it quoted?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
3RV2421-1JA10