BOM / RFQ

Siemens 3RV2021-4NA10 — Motor Protection Circuit Breakers (MPCB)

Siemens 3RV2021-4NA10 SIRIUS MCP, Class 10, 45mm

Name: 3RV2021-4NA10
Brand: Siemens
SKU: 3RV2021-4NA10
Availability: LimitedAvailability
Author: Scan-Cycle Stefan

MPN3RV2021-4NA10

Active

Siemens SIRIUS 3RV2021-4NA10 motor protection circuit breaker, Class 10, 45 mm width, 28 A at 480 V, 100 kA at 240 V.

$45.72Ref. price · indicative, final on quote

Add to RFQ

Siemens 3RV2021-4NA10 datasheet (PDF)

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

Specifications

3RV2021-4NA10 — Identification
Parameter	Value
Series	SIRIUS
Product designation	Circuit breaker
Frame size	S0

3RV2021-4NA10 — Electrical
Parameter	Value
Rated operational current (Ie)	28 A
Rated voltage	20 ... 690 V
Rated voltage, AC-3 (max.)	690 V
Rated frequency	50 ... 60 Hz
Rated insulation voltage (Ui), pollution degree 3	690 V
Rated impulse withstand voltage (Uimp)	6 kV
Number of poles	3
Power loss (AC, hot)	13.25 W
Power loss, per pole (AC, hot)	4.4 W

3RV2021-4NA10 — Protection & Tripping
Parameter	Value
Overload release setting range	23 ... 28 A
Instantaneous short-circuit trip current	364 A
Trip class	CLASS 10
Breaking capacity at 240 V (AC)	100 kA
Breaking capacity at 400 V (AC)	55 kA
Breaking capacity at 500 V (AC)	10 kA
Breaking capacity at 690 V (AC)	4 kA
Breaking capacity at 240 V	100 kA
Breaking capacity at 690 V	2 kA
Short-circuit trip type	magnetic
Overload release type	thermal
Short-circuit protection	Yes
Phase-failure detection	Yes
Ground-fault detection	No
Auxiliary switch extendable	Yes

3RV2021-4NA10 — Endurance & Switching
Parameter	Value
Endurance, main contacts (typ.)	100 000
Endurance, auxiliary contacts (typ.)	100 000
Switching frequency, AC-3 (max.)	15 1/h
Auxiliary CO (changeover) contacts	0

3RV2021-4NA10 — Connections
Parameter	Value
Main-circuit terminal type	screw-type terminals
Main-circuit connector arrangement	Top and bottom
Conductor cross-section, solid / stranded	2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)
Conductor cross-section, finely stranded with ferrule	2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²

3RV2021-4NA10 — Mechanical
Parameter	Value
Height	97 mm
Width	45 mm
Depth	97 mm
Mounting method	screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Mounting position	any

3RV2021-4NA10 — Environmental
Parameter	Value
Operating temperature	-20 ... +60 °C
Storage temperature	-50 ... +80 °C
Transport temperature	-50 ... +80 °C
Relative humidity (operation)	10 ... 95 %
Max. installation altitude	2 000 m

3RV2021-4NA10 — Specifications
Parameter	Value
Design Of The Product	For motor protection

Product details

The 3RV2021-4NA10: The breaker measures 45 mm wide by 97 mm deep by 97 mm tall, mounting on a 35 mm DIN rail per DIN EN 60715 via screw and snap-on. This is a standard footprint for a 45 mm motor-protective device, leaving a 50 mm clearance above and below, and 30 mm on the sides. The part operates at rated voltages from 20 to 690 V.

Any orientation is permissible. Clearance: 50 mm above and below, 30 mm sides, 0 mm forward and backward — so panel layout needs space only for height and width, not depth behind the rail. The trip current is adjustable (rated value range not specified in evidence, but the unit is a motor-protective breaker with Class 10). For a standard 3-phase motor circuit, this breaker sits ahead of the contactor and overload relay, providing short-circuit and overload protection in one device.