The 25 A continuous rating is the load it carries without tripping under normal conditions — sized for a 25 A feeder or branch circuit. The interrupting capacity ramps from 187 kA at 240 V down to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3.7 kA at 690 V. The ground-fault monitoring version uses summation current formation on the L-conductor, meaning it detects leakage by summing phase currents — common for solidly-grounded systems where you need earth-fault protection integrated into the breaker rather than a separate relay. Communication function is present, which on the 3VA platform typically means it can report status and trip events over a bus, though the specific protocol depends on the communication module ordered separately.
Siemens SENTRON 3VA2125-5JQ36-0AA0 MCCB, 25 A, 3-Pole, 121 k
Siemens SENTRON 3VA2125-5JQ36-0AA0, molded case circuit breaker, 3-pole, 25 A continuous rating, 121 kA breaking capacity at 415 V AC, line protection design, with ground-fault monitoring and communication function.
Specifications
| Parameter | Value |
|---|---|
| Product designation | Molded case circuit breaker |
| Brand / range | SENTRON |
| Parameter | Value |
|---|---|
| Number of poles | 3 |
| Rated operational voltage Ue (AC) | 690 V |
| Rated insulation voltage Ui | 800 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 | M |
| 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 |
| Parameter | Value |
|---|---|
| Overcurrent release (trip unit) type | ETU560 |
| Overcurrent protection function | LSIG |
| Ground-fault monitoring | Summation current formation L-conductor |
| Grounding protection function | Yes |
| Parameter | Value |
|---|---|
| Main circuit connection type | double-sided box terminal |
| Main circuit connector arrangement | Front terminal |
| Protection class (IP), front | IP40 |
| Parameter | Value |
|---|---|
| Undervoltage release | No |
| Voltage trigger | No |
| Trip indicator | No |
| Communication function | Yes |
| Measurement function | No |
| Motor drive option | Yes |
| Auxiliary CO contacts | 0 |
| Parameter | Value |
|---|---|
| Operating temperature, max. | 70 °C |
| Operating temperature, min. | -25 °C |
| Storage temperature, max. | 80 °C |
| Storage temperature, min. | -40 °C |
| Parameter | Value |
|---|---|
| Mechanical service life (operating cycles), typ. | 25 000 |
| 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
What is the breaking capacity of this MCCB at 415 V?
121 kA at 415 V AC. At 240 V it's 187 kA, at 500 V it's 75.6 kA, and at 690 V it drops to 3.7 kA. The 415 V figure is the one to verify against your available fault current for most industrial 400 V systems.
Where can I buy 3VA2125-5JQ36-0AA0?
Sourced and quoted to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time, no stock count or lead-time number published here.
Does this breaker include ground-fault protection?
Yes, it has ground-fault monitoring via summation current formation on the L-conductor. That's integrated into the breaker, not a separate add-on module.