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Siemens 3RV2321-1KC10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2321-1KC10 SIRIUS Circuit Breaker, 100 kA at 400

MPN3RV2321-1KC10
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Siemens SIRIUS 3RV2321-1KC10 circuit breaker for starter combinations, 100 kA breaking capacity at 400 V AC, 45 mm width, screw-type terminals.

$38.10Ref. price · indicative, final on quote
Siemens 3RV2321-1KC10 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RV2321-1KC10 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2321-1KC10 — Electrical
ParameterValue
Rated operational current (Ie)12.5 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
3RV2321-1KC10 — Protection & Tripping
ParameterValue
Instantaneous short-circuit trip current163 A
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
Short-circuit protectionYes
Phase-failure detectionNo
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2321-1KC10 — 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
3RV2321-1KC10 — 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
3RV2321-1KC10 — 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
3RV2321-1KC10 — 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
3RV2321-1KC10 — Specifications
ParameterValue
Design Of The ProductFor starter combinations

Product details

Screw-type terminals on the main circuit accept 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²) solid or stranded copper.

Motor ratings and breaking capacity

Rated for motor loads across common North American and IEC voltages: 3 hp at 200/208 V and 220/230 V, 8 hp at 460/480 V, 10 hp at 575/600 V. At 230 V it delivers 2 hp. The continuous current rating at 480 V is 12.5 A, same at 600 V — that's the thermal-magnetic trip threshold for overload protection. Breaking capacity varies by voltage: 100 kA at 240 V and 400 V AC, 42 kA at 500 V AC, 4 kA at 690 V AC.

Operating environment

The rated insulation voltage spans 20 to 690 V. No ground-fault or phase-failure detection built in — those functions are handled upstream or by the connected starter assembly.

Frequently asked questions

Where can I buy 3RV2321-1KC10 and how do I get a price?

The 3RV2321-1KC10 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

What is the breaking capacity of 3RV2321-1KC10 at 400 V?

100 kA at 400 V AC, which allows it to be used on high-fault-capacity systems without requiring a current-limiting upstream fuse.

What motor horsepower ratings does 3RV2321-1KC10 support?

3 hp at 200/208 V and 220/230 V, 8 hp at 460/480 V, and 10 hp at 575/600 V.

MPN
3RV2321-1KC10