The Siemens 3VA1450-4FF42-0AA0 is a SENTRON molded case circuit breaker rated for 500 A continuous at 40 °C, with no derating needed up to 50 °C — it holds the full 500 A through that range. Above 50 °C it steps down linearly: 488 A at 55 °C, 476 A at 60 °C, 464 A at 65 °C, and 452 A at 70 °C. The interrupting ratings span the common distribution voltages: 121 kA at 240 V, 75.6 kA at 415 V and 440 V, 52.5 kA at 500 V, and 11.9 kA at 690 V. The TM240 thermal-magnetic release is adjustable (the I-trip design is field-adjustable), so you can fine-tune the overload pickup without swapping trip units.
Siemens 3VA1450-4FF42-0AA0 SENTRON MCCB, 500 A, 4-Pole, TM24
MPN3VA1450-4FF42-0AA0
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Siemens SENTRON 3VA1450-4FF42-0AA0, molded case circuit breaker, 4-pole, 500 A, TM240 thermal-magnetic release, line protection version, IP40 front.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Product designation | Molded case circuit breaker |
| Brand / range | SENTRON |
| Product version | Line protection |
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Rated operational voltage Ue (AC) | 690 V |
| Rated insulation voltage Ui | 800 V |
| Current at 40 °C | 500 A |
| Current at 45 °C | 500 A |
| Current at 50 °C | 500 A |
| Current at 55 °C | 488 A |
| Current at 60 °C | 476 A |
| Current at 65 °C | 464 A |
| Current at 70 °C | 452 A |
| Switching capacity class | S |
| Breaking capacity at 240 V | 121 kA |
| Breaking capacity at 415 V | 75.6 kA |
| Breaking capacity at 440 V | 75.6 kA |
| Breaking capacity at 500 V | 52.5 kA |
| Breaking capacity at 690 V | 11.9 kA |
| Power loss, max. | 122.7 W |
| Parameter | Value |
|---|---|
| Overcurrent release (trip unit) type | TM240 |
| Overcurrent protection function | LI |
| Ground-fault monitoring | Without |
| Parameter | Value |
|---|---|
| Main circuit connection type | nut keeper kit on both ends |
| Main circuit connector arrangement | Front terminal |
| Protection class (IP), front | IP40 |
| Parameter | Value |
|---|---|
| Undervoltage release | No |
| Voltage trigger | No |
| Trip indicator | No |
| Communication function | No |
| 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 |
|---|---|
| Height | 248 mm |
| Width | 184 mm |
| Depth | 110 mm |
| Height (in) | 9.76 in |
| Width (in) | 7.24 in |
| Depth (in) | 4.33 in |
Product details
MPN
3VA1450-4FF42-0AA0