The Siemens SENTRON 3VA2125-5MQ36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for motor protection duty. It carries a continuous current rating of 25 A across the full ambient temperature range from 40 °C to 70 °C, meaning no derating is needed in a warm panel — a practical advantage when the breaker sits near other heat sources. The ETU860M electronic trip unit provides adjustable trip classes (10A, 10/10E, 20/20E, 30/30E), phase failure detection, and ground-fault monitoring via summation current formation on the L-conductor. This makes it suited for protecting motor feeders where coordination with upstream devices and downstream starting curves matters. Breaking capacity reaches 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The steep drop at 690 V is typical for an MCCB with this frame size — verify the available fault current at your system voltage before specifying. The breaker includes a communication function, allowing integration into a higher-level monitoring or control scheme. Front-side protection is IP40, suitable for enclosed panel mounting.
Siemens 3VA2125-5MQ36-0AA0 SENTRON MCCB, 25 A, ETU860M
Siemens SENTRON 3VA2125-5MQ36-0AA0, molded case circuit breaker, 3-pole, 25 A, ETU860M electronic release, 187 kA at 240 V AC.
Specifications
Identification
| Parameter | Value |
|---|---|
| Product designation | Molded case circuit breaker |
| Brand / range | SENTRON |
| Product version | Motor protection |
Ratings
| Parameter | Value |
|---|---|
| Number of poles | 3 |
| Rated operational voltage Ue (AC) | 690 V |
| Current at 40 °C | 25 A |
| Current at 45 °C | 25 A |
| Current at 50 °C | 25 A |
| Current at 55 °C | 25 A |
| Current at 60 °C | 25 A |
| Current at 65 °C | 25 A |
| Current at 70 °C | 25 A |
| Switching capacity class | E |
| Breaking capacity at 240 V | 187 kA |
| Breaking capacity at 415 V | 121 kA |
| Breaking capacity at 440 V | 121 kA |
| Breaking capacity at 500 V | 75.6 kA |
| Breaking capacity at 690 V | 3.7 kA |
| Power loss, max. | 0.6 W |
Protection & Trip Unit
| Parameter | Value |
|---|---|
| Overcurrent release (trip unit) type | ETU860M |
| Overcurrent protection function | LSIG |
| Ground-fault monitoring | Summation current formation L-conductor |
Construction & Connection
| Parameter | Value |
|---|---|
| Main circuit connection type | double-sided box terminal |
| Main circuit connector arrangement | Front terminal |
| Protection class (IP), front | IP40 |
Accessories & Functions
| Parameter | Value |
|---|---|
| Undervoltage release | No |
| Voltage trigger | No |
| Trip indicator | No |
| Communication function | Yes |
| Measurement function | Yes |
| Motor drive option | Yes |
| Auxiliary CO contacts | 0 |
Environmental
| Parameter | Value |
|---|---|
| Operating temperature, max. | 70 °C |
| Operating temperature, min. | -25 °C |
| Storage temperature, max. | 80 °C |
| Storage temperature, min. | -40 °C |
Mechanical
| Parameter | Value |
|---|---|
| Height | 181 mm |
| Width | 105 mm |
| Depth | 86 mm |
| Height (in) | 7.13 in |
| Width (in) | 4.13 in |
| Depth (in) | 3.39 in |
Product details
Frequently asked questions
Where can I buy 3VA2125-5MQ36-0AA0 and how do I get a price?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
Will 3VA2125-5MQ36-0AA0 drop into a panel that was specified around 3VA2125-8KQ42-0AA0 without rewiring?
Both are 3-pole SENTRON MCCBs in the same frame size, so the footprint and mounting are identical. The deciding difference is the trip unit: this one carries an ETU860M electronic release with adjustable trip classes and ground-fault monitoring, while the 8KQ42 variant uses a different release. No rewiring is needed for the power connections, but the control wiring for the trip unit functions may differ.
What compliance documentation does this brand provide for 3VA2125-5MQ36-0AA0?
As a Siemens SENTRON product, it is designed to meet applicable IEC and UL standards for molded case circuit breakers. Specific declarations (RoHS, REACH, UL, IEC) are available from Siemens documentation or upon request with an RFQ.