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Siemens 3RV2021-1DA20 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-1DA20 SIRIUS Motor Protection Circuit Breake

MPN3RV2021-1DA20
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Siemens SIRIUS 3RV2021-1DA20 motor protection circuit breaker, Class 10, screw and snap-on 35 mm DIN rail mount, spring-loaded terminals, 100 kA SCCR at 400 V AC.

$34.29Ref. price · indicative, final on quote
Siemens 3RV2021-1DA20 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2021-1DA20 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-1DA20 — 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)7.25 W
Power loss, per pole (AC, hot)2.4 W
3RV2021-1DA20 — Protection & Tripping
ParameterValue
Overload release setting range2.2 ... 3.2 A
Instantaneous short-circuit trip current42 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
3RV2021-1DA20 — 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
3RV2021-1DA20 — 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)
3RV2021-1DA20 — Mechanical
ParameterValue
Height119 mm
Width45 mm
Depth97 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting positionany
3RV2021-1DA20 — 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
3RV2021-1DA20 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

Motor protection circuit breaker for panel integration

The Siemens 3RV2021-1DA20 is a SIRIUS motor protection circuit breaker designed for Class 10 trip response, meaning it disconnects within 10 seconds at 7.2× the thermal setting — fast enough to protect standard induction motors during locked-rotor conditions without nuisance tripping on normal starts.

Short-circuit withstand and coordination

Rated short-circuit breaking capacity reaches 100 kA at 240 V AC and 400 V AC, and 100 kA at 500 V AC, dropping to 10 kA at 690 V AC — sufficient for most industrial distribution systems where fault levels are coordinated upstream. The 3RV2021-1DA20 carries hp ratings from 0.1 hp at 110/120 V up to 2 hp at 460/480 V and 575/600 V, covering fractional to small integral-horsepower motors on common North American and IEC voltage systems.

Frequently asked questions

What is the SCCR of the 3RV2021-1DA20 at 400 V AC?

100 kA at 400 V AC, which means it can safely interrupt a fault current up to 100,000 amperes at that voltage without external fusing — sufficient for most industrial service-entrance and distribution panel applications.

Does the 3RV2021-1DA20 detect phase failure?

Yes, phase failure detection is standard, so the breaker will trip if one phase is lost, protecting the motor from single-phasing damage.

What is the mounting method for the 3RV2021-1DA20?

Screw fixing or snap-on mounting onto 35 mm DIN rail per DIN EN 60715, in any mounting position, allowing flexible panel integration.

Where can I buy the 3RV2021-1DA20?

This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

MPN
3RV2021-1DA20