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Siemens 3RV2021-0KA15 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-0KA15 SIRIUS Motor Protection Circuit Breake

MPN3RV2021-0KA15
Active

Siemens SIRIUS motor protection circuit breaker, 3RV2021-0KA15, Class 10 trip, 100 kA breaking capacity at 400 V, screw terminals, DIN rail mount.

$40.64Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2021-0KA15 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-0KA15 — Electrical
ParameterValue
Rated operational current (Ie)1.25 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)7.25 W
Power loss, per pole (AC, hot)2.4 W
3RV2021-0KA15 — Protection & Tripping
ParameterValue
Overload release setting range0.9 ... 1.25 A
Instantaneous short-circuit trip current16 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
Breaking capacity at 240 V100 kA
Breaking capacity at 690 V100 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2021-0KA15 — 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
3RV2021-0KA15 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor range, AWG (main contacts)2x (16 ... 12), 2x (14 ... 8)
3RV2021-0KA15 — 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
3RV2021-0KA15 — 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
3RV2021-0KA15 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

Motor protection circuit breaker for panel integration

It occupies a 45 mm wide footprint on the rail, with a depth of 97 mm and height of 97 mm. The breaker includes phase failure detection, so a lost phase on the line side will trip the motor off, preventing single-phasing damage. Breaking capacity is 100 kA at 400 V, 500 V, and 690 V, and also at 240 V.

Motor power and current ratings

Rated for a 0.2 kW motor at 230 V, 1 hp at 460/480 V, and 0.5 hp at 575/600 V. The auxiliary contact block handles 1 A at 24 V, 0.5 A at 120/125/230 V, and 0.15 A at 60 V. Maximum operating frequency is 15 switching cycles per hour in AC-3 and AC-3e duty — sufficient for typical conveyor or pump start-stop cycles, not for high-speed jogging.

Mounting position is any orientation. Required clearances: 50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards — meaning it can be stacked against the back panel and adjacent devices without side gaps, as long as vertical breathing space is maintained. Screw-type terminals on the main current circuit accept 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded wire. Main contact screws are M4.

Frequently asked questions

What is the breaking capacity of the 3RV2021-0KA15?

100 kA at 240 V, 400 V, 500 V, and 690 V. This is the rated short-circuit breaking capacity per IEC 60947-2.

What trip class is the 3RV2021-0KA15?

Class 10. It will trip within 10 seconds at 7.2× the thermal current setting, matching standard induction motor starting profiles.

Does the 3RV2021-0KA15 include phase failure protection?

Yes, phase failure detection is built in. It will trip the motor off if one phase is lost, preventing single-phasing damage.

What are the mounting clearances for the 3RV2021-0KA15?

50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards. It can be mounted against the back panel and adjacent devices with no side gaps.

Where can I buy the 3RV2021-0KA15 and get current pricing?

This part is sourced and quoted to order through independent distribution. Submit an RFQ for current pricing and availability confirmation.

MPN
3RV2021-0KA15