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Siemens 3RV1321-0KC10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1321-0KC10 SIRIUS Circuit Breaker, 1.25 A, 100 kA

MPN3RV1321-0KC10

Siemens SIRIUS 3RV1321-0KC10 circuit breaker for starter combinations, 1.25 A continuous rated current, 100 kA breaking capacity at 400 V AC, 3-pole, screw terminals, DIN rail mount, IP20.

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

3RV1321-0KC10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1321-0KC10 — 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)7.25 W
Power loss, per pole (AC, hot)2.4 W
3RV1321-0KC10 — Protection & Tripping
ParameterValue
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
Phase-failure detectionNo
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1321-0KC10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1321-0KC10 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementfront side
Conductor cross-section, finely stranded with ferrule2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)
Conductor range, AWG (main contacts)2x (14 ... 10)
3RV1321-0KC10 — Mechanical
ParameterValue
Height97 mm
Width45 mm
Depth96 mm
Mounting methodscrew and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022
Mounting positionany
3RV1321-0KC10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1321-0KC10 — Specifications
ParameterValue
Design Of The Productfor starter combinations

Product details

Rated at 1.25 A continuous current, it is sized for small motor loads — at 400 V AC it covers a 0.37 kW motor, which is typical for fractional-horsepower pumps, fans, or conveyor drives in light industrial lines. The headline figure here is the 100 kA breaking capacity, held flat across 240 V, 400 V, 500 V, and 690 V AC.

The 45 mm width (3-module) footprint is standard for this class; height is 97 mm, depth 96 mm. Zero clearance required backwards, zero at the sides — so it can be packed tight against other devices on the rail without derating.

Electrical and thermal limits for the specifier

Maximum operating frequency at AC-3 duty is 15 operations per hour, so this is not a high-cycling device; it is sized for occasional motor starts, not rapid jogging. Shock resistance is rated at 25g / 11 ms, which covers most industrial vibration environments including conveyor systems and machine tools.

Main and auxiliary/control circuits both use screw-type terminals. Solid and stranded conductors are accepted: 2x (1... 2.5 mm²) or 2x (2.5... 6 mm²) per clamp, with AWG equivalents of 2x (14... 10). Finely stranded with core end processing is also supported in the same ranges.

RoHS compliance is confirmed with a substance prohibition date of 01.05.2012, covering the EU RoHS directive. The part does not include ground fault detection or phase failure detection — those functions must be handled upstream in the motor protection relay or drive. The auxiliary switch extension is available as an option (product extension auxiliary switch = Yes), allowing remote status signaling.

Frequently asked questions

What is the breaking capacity of 3RV1321-0KC10 at 400 V?

100 kA at 400 V AC, and the same 100 kA rating holds at 240 V, 500 V, and 690 V AC — flat across the voltage range.

Will 3RV1321-0KC10 drop into a panel specified around 3RV1011-0GA10?

Both are SIRIUS circuit breakers on the same 45 mm DIN-rail footprint, so the mechanical fit is the same. The key difference is the current rating and breaking capacity — verify your branch circuit's continuous current and available fault current against the 3RV1321-0KC10's 1.25 A and 100 kA ratings before swapping.

What compliance documentation does Siemens provide for 3RV1321-0KC10?

RoHS compliance is documented with a substance prohibition date of 01.05.2012. The part carries IP20 front protection and is designed for 690 V rated insulation voltage. Standard Siemens declarations of conformity and the product datasheet cover the applicable IEC/EN standards for motor protection circuit breakers.

Where can I buy 3RV1321-0KC10 and how is it quoted?

This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time on your required quantity.

MPN
3RV1321-0KC10