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Siemens 3RV1321-4AC10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV1321-4AC10 SIRIUS Circuit Breaker, 16 A, 7.5 kW a

MPN3RV1321-4AC10

Siemens SIRIUS, circuit breaker for starter combinations, 3RV1321-4AC10, 16 A continuous, 7.5 kW at 400 V AC-3, 50 kA breaking capacity at 400 V, screw terminals, DIN-rail snap-on.

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

Specifications

3RV1321-4AC10 — Identification
Parameter	Value
Series	SIRIUS
Product designation	circuit breaker

3RV1321-4AC10 — Electrical
Parameter	Value
Rated voltage	690 V
Rated voltage, AC-3 (max.)	690 V
Rated impulse withstand voltage (Uimp)	6 000 V
Number of poles	3
Power loss (AC, hot)	9.25 W
Power loss, per pole (AC, hot)	3.1 W

3RV1321-4AC10 — Protection & Tripping
Parameter	Value
Breaking capacity at 240 V (AC)	100 kA
Breaking capacity at 400 V (AC)	50 kA
Breaking capacity at 500 V (AC)	10 kA
Breaking capacity at 690 V (AC)	4 kA
Phase-failure detection	No
Ground-fault detection	No

3RV1321-4AC10 — Endurance & Switching
Parameter	Value
Endurance, main contacts (typ.)	100 000
Switching frequency, AC-3 (max.)	15 1/h

3RV1321-4AC10 — Connections
Parameter	Value
Main-circuit terminal type	screw-type terminals
Main-circuit connector arrangement	front side
Conductor cross-section, finely stranded with ferrule	2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)

3RV1321-4AC10 — Mechanical
Parameter	Value
Height	97 mm
Width	45 mm
Depth	96 mm
Mounting position	any

3RV1321-4AC10 — Environmental
Parameter	Value
Operating temperature	-20 ... +60 °C
Storage temperature	-50 ... +80 °C
Transport temperature	-50 ... +80 °C
Max. installation altitude	2 000 m

3RV1321-4AC10 — Specifications
Parameter	Value
Design Of The Product	for starter combinations

Product details

What this SIRIUS circuit breaker does in a panel

Rated 16 A continuous and 7.5 kW at 400 V AC-3, it handles the full-load current of a 7.5 kW motor directly. The 100 kA at 240 V covers most North American 240 V distribution.

The screw-type terminals on the main circuit accept 2x (1 to 2.5 mm²) solid or stranded with ferrules, or 2x (2.5 to 6 mm²) for heavier feeds. The auxiliary and control circuit uses the same screw terminal type. Depth is 96 mm, height 97 mm, width 45 mm. Zero clearance needed on the back side; 0 mm sideways clearance required. That means you can pack these tight on a DIN rail without derating for spacing. IP20 on the front — fine for a closed panel, not for washdown areas.

Frequently asked questions

What compliance documentation is available for 3RV1321-4AC10?

The part carries the SIRIUS brand from Siemens and is designed for IEC and UL-style installations. Specific RoHS, REACH, UL, or IEC declarations are available from the manufacturer — we can include them with the quote.