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Siemens 3RV2021-0KA20 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-0KA20 SIRIUS Motor Protection Circuit Breake

MPN3RV2021-0KA20
Active

Siemens SIRIUS motor protection circuit breaker, 3RV2021-0KA20, Size S0, 100 kA interrupting capacity at 400 V, Trip Class 10, spring-loaded terminals.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

3RV2021-0KA20 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-0KA20 — 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
3RV2021-0KA20 — 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
3RV2021-0KA20 — 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
3RV2021-0KA20 — Connections
ParameterValue
Main-circuit terminal typespring-loaded terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (1 ... 10 mm²)
Conductor cross-section, finely stranded with ferrule2x (1 ... 6 mm²)
Conductor range, AWG (main contacts)2x (18 ... 8)
3RV2021-0KA20 — Mechanical
ParameterValue
Height119 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Mounting positionany
3RV2021-0KA20 — 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
3RV2021-0KA20 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

The breaker is active in the current lifecycle stage, so it remains a standard BOM line item rather than a last-time-buy scavenge.

Width is 45 mm, depth 97 mm, height 119 mm — fits a standard 45 mm slot on a DIN rail; the S0 frame leaves room for adjacent breakers in a motor control center. Any mounting position is allowed, so vertical or horizontal rail orientation works. Clearance: 50 mm above and below, 30 mm to the side, zero forward or backward — the breaker sits flush against the backplane.

Frequently asked questions

What is the interrupting capacity of 3RV2021-0KA20?

The breaker has a 100 kA interrupting capacity at 400 V AC, which means it can safely interrupt faults up to 100 kA at that voltage — sufficient for most industrial panel SCCR requirements.

Will 3RV2021-0KA20 drop into a panel specified around 3RV2011-0BA20?

Both are Size S0 breakers with the same DIN rail mounting and similar terminal style, so the 3RV2021-0KA20 will physically fit in a panel designed for the 3RV2011-0BA20 without rewiring. However, verify the trip class and current rating match your motor protection settings before substitution.

How do I get current pricing and availability for 3RV2021-0KA20?

Submit an RFQ through this listing. The part is sourced to order against your request, and availability and current pricing are confirmed at quote time.

MPN
3RV2021-0KA20