Siemens Circuit Breaker – Size S0 Motor Protection –
3RV2021-4EA25
The Siemens 3RV2021-4EA25 is a SIRIUS 3RV2 series
motor protection circuit breaker (MPCB) designed for reliable protection of
three-phase motors against overload, short-circuit, and phase failure.
It is widely used in motor starter assemblies, MCC panels, industrial
automation systems, pumps, compressors, conveyors, and HVAC applications
where compact and dependable motor protection is required.
This device belongs to the Size S0 frame (3RV2 series)
and features a thermal magnetic trip system (Class 10). It provides adjustable
thermal overload protection (27–32 A range) along with a fixed
short-circuit release (magnetic trip typically around 400 A), ensuring fast
and safe disconnection during fault conditions.
It is designed to be used together with SIRIUS contactors
(like 3RT series), forming a complete and compact motor starter
combination.
Key Features
|
Parameter |
Specification |
|
Product Model |
3RV2021-4EA25 |
|
Brand |
Siemens |
|
Series |
SIRIUS 3RV2 |
|
Type |
Motor Protection Circuit Breaker (MPCB) |
|
Frame Size |
S0 |
|
Current Setting Range |
27 – 32 A |
|
Short-Circuit Release |
400 A |
|
Tripping Class |
Class 10 |
|
Protection Functions |
Overload, short-circuit, phase failure |
|
Mounting Type |
DIN rail / panel mounting |
|
Rated Voltage |
Up to 690 V AC |
|
Frequency |
50/60 Hz |
|
Coordination Type |
Motor starter combination (with contactor) |
|
Standards |
IEC 60947-4-1 |
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