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Siemens 3RV1321-1EC10 — Motor Protection Circuit Breakers (MPCB)

Siemens SIRIUS 3RV1321-1EC10 Circuit Breaker, 4 A, 100 kA

MPN3RV1321-1EC10

Siemens SIRIUS, circuit breaker for starter combinations, 3RV1321-1EC10, 3-pole, 4 A continuous, 100 kA breaking capacity at 400 V AC, IP20, screw terminals.

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

3RV1321-1EC10 — Identification
ParameterValue
SeriesSIRIUS
Product designationcircuit breaker
3RV1321-1EC10 — 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
3RV1321-1EC10 — 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)6 kA
Phase-failure detectionNo
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV1321-1EC10 — Endurance & Switching
ParameterValue
Auxiliary CO (changeover) contacts0
3RV1321-1EC10 — 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)
3RV1321-1EC10 — 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
3RV1321-1EC10 — Environmental
ParameterValue
Operating temperature-20 ... +60 °C
Storage temperature-50 ... +80 °C
Transport temperature-50 ... +80 °C
Max. installation altitude2 000 m
3RV1321-1EC10 — Specifications
ParameterValue
Design Of The Productfor starter combinations

Product details

What this 4 A motor circuit breaker does on the rail

Rated 4 A continuous current, it handles a 1.5 kW motor at 400 V AC (AC-3 duty).

Breaking capacity — the real-world number

At 690 V AC it drops to 6 kA.

Dimensions: 45 mm wide, 97 mm high, 96 mm deep. Zero clearance needed at the back or sides — no derating for side-by-side mounting on the rail. The 7.25 W power dissipation at rated current (2.4 W per pole) means it runs warm; if you pack several of these in a sealed enclosure, factor that heat into the cabinet cooling calc.

Frequently asked questions

What is the breaking capacity of this breaker at 400 V?

100 kA at 400 V AC. That's the same rating at 240 V and 500 V AC; at 690 V AC it drops to 6 kA.

Where can I buy the 3RV1321-1EC10?

This part is 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 commitment.

Will the 3RV1321-1EC10 drop into a panel built for the 3RV6021-4DA10?

Both are 3-pole SIRIUS breakers on the same 45 mm DIN-rail footprint. The 3RV1321-1EC10 is a 4 A unit with 100 kA breaking capacity; the 3RV6021-4DA10 is a different current rating and breaking capacity. Check your motor FLA and fault current before swapping — the rail fit is the same, but the protection settings differ.

What compliance documentation comes with this part?

The part is RoHS compliant per the substance prohibition date of 01.05.2012. It carries IP20 finger-safe touch protection. For specific UL, CSA, or IEC certification documents, request them with your RFQ — the manufacturer provides them with the shipment.

MPN
3RV1321-1EC10