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Siemens 3RV2021-1JA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-1JA10 SIRIUS Motor Protection Circuit Breake

MPN3RV2021-1JA10
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Siemens SIRIUS 3RV2021-1JA10 motor protection circuit breaker, Trip Class 10, 45 mm wide, 100 kA interrupting capacity at 400 V AC, screw terminals, DIN rail mount.

$117.72Ref. price · indicative, final on quote
Siemens 3RV2021-1JA10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2021-1JA10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-1JA10 — 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
3RV2021-1JA10 — Protection & Tripping
ParameterValue
Overload release setting range7 ... 10 A
Instantaneous short-circuit trip current130 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
3RV2021-1JA10 — 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
3RV2021-1JA10 — 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)
3RV2021-1JA10 — 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
3RV2021-1JA10 — 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
3RV2021-1JA10 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

The Siemens SIRIUS 3RV2021-1JA10 is a motor protection circuit breaker — the one that sits ahead of a contactor in a motor starter, sized for a 3-phase induction motor up to 10 hp at 575/600 V. It's Trip Class 10, so it trips fast enough to protect a standard motor during start-up without nuisance tripping on normal inrush. Rated for 20... 690 V AC, it carries a 100 kA interrupting capacity at both 240 V and 400 V — that's the short-circuit current it can safely clear, which is the number that matters for panel SCCR coordination.

Width is 45 mm, depth 97 mm, height 97 mm. Main terminals are M4 screw-type, accepting 2x 1... 2.5 mm² or 2x 2.5... 10 mm² solid or stranded.

Frequently asked questions

What is the interrupting capacity at 400 V?

100 kA at 400 V AC. That's the same as the 240 V rating, so coordination with upstream breakers is straightforward across common distribution voltages.

Does it detect phase failure?

Yes, phase failure detection is built in. It will trip if one phase drops out, protecting the motor from single-phasing.

What clearance is needed around the breaker?

50 mm above and below for arc venting; zero clearance to the sides or front/back. That keeps panel fill factor tight.

MPN
3RV2021-1JA10