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Siemens 3RV2021-4BA15-ZX95 — Motor Protection Circuit Breakers (MPCB)

Siemens SIRIUS 3RV2021-4BA15-ZX95 Motor Protection Circuit B

MPN3RV2021-4BA15-ZX95
Active

Siemens SIRIUS, motor protection circuit breaker, 3RV2021-4BA15-ZX95, Class 10 trip, 45 mm width, 97 mm depth, screw and snap-on 35 mm DIN rail.

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

3RV2021-4BA15-ZX95 — Identification
ParameterValue
SeriesSIRIUS
Product designationCircuit breaker
Frame sizeS0
3RV2021-4BA15-ZX95 — Electrical
ParameterValue
Rated operational current (Ie)20 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)10.5 W
Power loss, per pole (AC, hot)3.5 W
3RV2021-4BA15-ZX95 — Protection & Tripping
ParameterValue
Overload release setting range13 ... 20 A
Instantaneous short-circuit trip current260 A
Trip classCLASS 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 V100 kA
Breaking capacity at 690 V2 kA
Short-circuit trip typemagnetic
Overload release typethermal
Short-circuit protectionYes
Phase-failure detectionYes
Ground-fault detectionNo
Auxiliary switch extendableYes
3RV2021-4BA15-ZX95 — 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
3RV2021-4BA15-ZX95 — Connections
ParameterValue
Main-circuit terminal typescrew-type terminals
Main-circuit connector arrangementTop and bottom
Conductor cross-section, solid / stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Conductor cross-section, finely stranded with ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
3RV2021-4BA15-ZX95 — 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
3RV2021-4BA15-ZX95 — 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
3RV2021-4BA15-ZX95 — Specifications
ParameterValue
Design Of The ProductFor motor protection

Product details

It is part of the SIRIUS brand, a widely used industrial control component family. The breaker is rated for a voltage range of 20 to 690 V and offers a Class 10 trip characteristic, meaning it will trip within 10 seconds at 7.2x the thermal setting — fast enough to protect standard induction motors during a locked-rotor event without nuisance tripping on normal starts. Ground fault detection is not included, so for applications requiring ground-fault protection, an external GFCI or residual-current device would need to be added downstream.

Depth is 97 mm, height 97 mm — a compact cube that fits in shallow enclosures. Clearance distances: 50 mm upwards and downwards, 30 mm at the sides, 0 mm forwards and backwards. That means you can butt it against the back panel and adjacent devices on the sides, but need breathing room above and below for arc venting and heat dissipation.

Short-circuit breaking capacity is 100 kA at 240 V, 25 kA at 400 V, 5 kA at 500 V, and 2 kA at 690 V. At 480 V it is rated for 20 A continuous, and at 600 V also 20 A. At 400 V, 25 kA covers typical industrial service-entrance fault levels. For backup protection with gL/gG fuses: 63 A at 400 V, 50 A at 500 V and 690 V. This coordination data lets you size the upstream fuse to clear before the breaker reaches its breaking limit, maintaining selectivity in a distribution panel.

Auxiliary contact ratings: 1 A at 24 V, 0.5 A at 120/125/230 V, 0.15 A at 60 V. These are for the internal auxiliary switch used to signal the breaker's status to a PLC or indicator light. The main contact terminals accept M4 screws and 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded wire.

Frequently asked questions

What is the closest functional alternative to the 3RV2021-4BA15-ZX95?

The 3RV2021-4CA25 is a peer within the same SIRIUS family. Both are 45 mm wide motor protection breakers with Class 10 trip, but the 4CA25 variant typically has a different current setting range or auxiliary contact configuration. Check the specific current range and auxiliary contact count to confirm drop-in fit without rewiring.

Will the 3RV2021-4BA15-ZX95 drop into a panel specified for the 3RV2021-4CA25?

Yes, both share the same 45 mm width, 97 mm depth, and DIN-rail mounting. The footprint and terminal layout are identical, so no rewiring or panel modification is needed. The difference is in the internal current setting range and possibly auxiliary contact configuration — verify those match your motor FLA before swapping.

How do I get current pricing and availability for the 3RV2021-4BA15-ZX95?

Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through our independent distribution network. Availability is typically good for current-production SIRIUS parts.

What compliance documentation does Siemens provide for this breaker?

As a SIRIUS motor protection circuit breaker, it carries CE marking for the European market and is designed to meet IEC/EN 60947-2 and 60947-4-1 standards. UL and CSA listings are typical for the SIRIUS family, though the specific listing for this variant should be confirmed from the product label or Siemens documentation.

MPN
3RV2021-4BA15-ZX95