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Siemens 3RV1021-1KA15 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1021-1KA15 SIRIUS Motor Circuit Breaker, 12.5 A,

MPN3RV1021-1KA15

Siemens SIRIUS 3RV1021-1KA15, motor-protective circuit breaker, 12.5 A rated continuous current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw terminals, snap-on DIN rail mount.

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

3RV1021-1KA15 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1021-1KA15 — Electrical
ParameterValue
Rated voltage690 V
Rated voltage, AC-3 (max.)690 V
Rated impulse withstand voltage (Uimp)6 000 V
Number of poles3
Power loss (AC, hot)9.25 W
Power loss, per pole (AC, hot)3.1 W
3RV1021-1KA15 — Protection & Tripping
ParameterValue
Overload release setting range9 ... 12.5 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
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1021-1KA15 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1021-1KA15 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementfront side
Conductor cross-section, finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
3RV1021-1KA15 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022
Mounting positionany
3RV1021-1KA15 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1021-1KA15 — Specifications
ParameterValue
Design Of The Productfor motor protection

Product details

The Siemens 3RV1021-1KA15 is a SIRIUS motor-protective circuit breaker rated for 12.5 A continuous current with a CLASS 10 trip curve, sized for a 5.5 kW motor at 400 V AC.

Snaps onto a 35 mm DIN rail per EN 50022 and accepts screw-type terminals for the main circuit — 2x (0.5…1.5 mm²) solid or 2x (1…2.5 mm²) stranded, with the larger 2.5…6 mm² stranded for heavier feeds. The auxiliary switch is transverse-mounted and field-addable; the part ships without one, but the extension slot is ready. Zero clearance needed at the sides or rear, so it packs tight in a crowded panel.

Breaking capacity by voltage — the real derating story

The 100 kA SCCR holds at 240 V and 400 V AC, then drops to 42 kA at 500 V and 6 kA at 690 V.

Frequently asked questions

What is the closest functional alternative — the 3RV1011-1HA10?

The 3RV1011-1HA10 is a physically smaller frame (S00 vs S0) with a lower 10 A rating and a lower breaking capacity. The 3RV1021-1KA15 will not drop into a panel wired for the 3RV1011-1HA10 without rewiring the main power terminals and checking the DIN-rail space — the S0 frame is 45 mm wide versus 45 mm on the S00, so width matches, but the terminal layout and lug sizes differ. Stick with the 3RV1021-1KA15 for the 12.5 A, 100 kA spec.

Where can I buy the 3RV1021-1KA15 and get current pricing?

Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What compliance documentation does this part carry?

RoHS compliance (substance prohibition date May 1, 2012), 6 kV surge voltage resistance rating, and IP20 protection on the front. The SIRIUS series typically carries UL, CSA, and CE approvals, but verify the specific certification markings on the nameplate for your jurisdiction.

MPN
3RV1021-1KA15