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Siemens 3RV2421-1DA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2421-1DA10 SIRIUS Circuit Breaker, 100 kA at 400

MPN3RV2421-1DA10
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Siemens SIRIUS circuit breaker, 3RV2421-1DA10, for transformer protection, Trip Class 10, 100 kA at 400 V, 45 mm wide, screw and snap-on mounting.

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

Specifications

3RV2421-1DA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2421-1DA10 — Electrical
ParameterValue
Rated operational current (Ie)3.2 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)5.5 W
Power loss, per pole (AC, hot)1.8 W
3RV2421-1DA10 — Protection & Tripping
ParameterValue
Overload release setting range2.2 ... 3.2 A
Instantaneous short-circuit trip current65 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)10 kA
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V10 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2421-1DA10 — 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
3RV2421-1DA10 — 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)
3RV2421-1DA10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting positionany
3RV2421-1DA10 — 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
3RV2421-1DA10 — Specifications
ParameterValue
Design Of The ProductFor transformer protection

Product details

Transformer-protection breaker, Trip Class 10

Rated voltage spans 20...690 V, with a breaking capacity of 100 kA at 400 V, so it handles bolted faults on a 400 V distribution bus without cascading upstream.

Clearance requirements: 50 mm upwards and downwards, 30 mm to the side, and 0 mm forwards and backwards. That 0 mm forward clearance means you can butt it against a back panel or enclosure wall — useful when you're tight on depth. The 97 mm height and depth are the same, so it's a cube-ish footprint. Terminals for the main circuit are M4 screw-type, accepting 2x (1...2.5 mm²) or 2x (2.5...10 mm²) solid or stranded.

Frequently asked questions

Where can I buy 3RV2421-1DA10 and how do I get a price?

This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — no stock count or price is published here.

What is 3RV2421-1DA10's listed depth (97 mm) on this component line?

The listed depth is 97 mm, with the same height of 97 mm and a width of 45 mm. Forward and backward clearance is 0 mm, so it can be mounted flush against a back panel.

What is 3RV2421-1DA10's listed width (45 mm) on this component line?

The width is 45 mm, which matches the standard footprint of many SIRIUS contactors and overloads for clean row mounting on 35 mm DIN rail.

Will 3RV2421-1DA10 drop into a panel that was specified around 3RV2021-1FA15 without rewiring?

Both parts are SIRIUS circuit breakers on a 45 mm wide DIN-rail footprint with M4 screw terminals, so the mechanical fit and terminal spacing are the same. However, 3RV2421-1DA10 is designed for transformer protection (Trip Class 10), while the 3RV2021-1FA15 serves a different application class — verify the trip curve and protection requirements before substituting.

MPN
3RV2421-1DA10