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Siemens 3VA5212-5EC31-0AA0 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Panel Mount
Siemens
3VA5212-5EC31-0AA0
Molded Case Circuit Breaker
Brand
Siemens
SKU
3VA5212-5EC31-0AA0
Quantity
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Siemens 3VA5212-5EC31-0AA0 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Quantity
Siemens 3VA5212-5EC31-0AA0 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | 3VA5212-5EC31-0AA0 |
| Series | 3VA5 |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC, 500VDC, 750VDC |
| Phase | 3 |
| AIC Rating | 85kA @ 240VAC, 35kA @ 480Y/277VAC, 35kA @ 480VAC, 18kA @ 600Y/347VAC, 18kA @ 600VAC, 50kA @ 250VDC, 50kA @ 500VDC, 50kA @ 750VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P2 Panelboards, Siemens P3 Panelboards, Switchboards, Enclosures |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Padlock Attachment, DIN Rail Adapter, Lug Kits |
|---|---|
| Accessories | Nut Keeper Kit |
| Standards | IEC 60947-2, UL 489, HACR |
| Approval | ABS, CE, CSA, EAC, IEC, UL, VDE |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Reverse Feed |
Quantity
Siemens 3VA5212-5EC31-0AA0 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Series | 3VA5 |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC, 500VDC, 750VDC |
| Phase | 3 |
| AIC Rating | 85kA @ 240VAC, 35kA @ 480Y/277VAC, 35kA @ 480VAC, 18kA @ 600Y/347VAC, 18kA @ 600VAC, 50kA @ 250VDC, 50kA @ 500VDC, 50kA @ 750VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P2 Panelboards, Siemens P3 Panelboards, Switchboards, Enclosures |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Padlock Attachment, DIN Rail Adapter, Lug Kits |
|---|---|
| Accessories | Nut Keeper Kit |
| Standards | IEC 60947-2, UL 489, HACR |
| Approval | ABS, CE, CSA, EAC, IEC, UL, VDE |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Reverse Feed |
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125A 3 Pole Molded Case Circuit Breaker
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125A 3 Pole Molded Case Circuit Breaker
Description
The 3VA5212-5EC31-0AA0 is part of Siemens' SENTRON line, providing advanced thermal-magnetic protection for industrial systems. This 3-pole, 125A breaker utilizes a TM230 trip unit, which combines fixed thermal protection with an adjustable magnetic trip for precise LI coordination. It mounts seamlessly into Siemens P2 and P3 panelboards, enclosures, and switchboards. Rated for 35kA at 480V, this current-limiting MCCB is the factory-recommended replacement for older FXD63B125 breakers.Specifications
| Brand | Siemens |
|---|---|
| Series | 3VA5 |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Panel Mount |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC, 500VDC, 750VDC |
| Phase | 3 |
| AIC Rating | 85kA @ 240VAC, 35kA @ 480Y/277VAC, 35kA @ 480VAC, 18kA @ 600Y/347VAC, 18kA @ 600VAC, 50kA @ 250VDC, 50kA @ 500VDC, 50kA @ 750VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P2 Panelboards, Siemens P3 Panelboards, Switchboards, Enclosures |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Motor Operator, Padlock Attachment, DIN Rail Adapter, Lug Kits |
|---|---|
| Accessories | Nut Keeper Kit |
| Standards | IEC 60947-2, UL 489, HACR |
| Approval | ABS, CE, CSA, EAC, IEC, UL, VDE |
| Temp Rating | -25C to 70C |
| Construction Features | HACR Rated, Current Limiting, Reverse Feed |
Product FAQs
8 answersWhat legacy Siemens circuit breaker does the 3VA5212-5EC31-0AA0 replace?
This 3VA5 series breaker is the factory recommended modern replacement for legacy FXD63B125 molded case circuit breakers.
What strap kit is required to mount this breaker in a Siemens P2 or P3 panelboard?
To install this 250A frame breaker in a Siemens P2 or P3 panelboard, you will need a compatible strap kit, such as the BBKVA5262P2S for single horizontal mounting. This kit adapts the breaker to the panel bus and includes the necessary deadfront fillers.
Are the trip settings adjustable on the 3VA5212-5EC31-0AA0?
The thermal overload protection (Long-Time) is fixed at 125A, but the magnetic short-circuit protection (Instantaneous) is adjustable. This allows panel builders to fine-tune the instantaneous trip point for precise coordination with other protective devices.
What is the frame size of the 3VA5212-5EC31-0AA0?
This circuit breaker is built on the Siemens 3VA52 frame, which is a 250A maximum frame size. It is configured from the factory with a 125A thermal-magnetic trip unit.
Can the 3VA5212-5EC31-0AA0 be used in DC voltage applications?
Yes, this thermal-magnetic circuit breaker is rated for DC systems up to 750VDC. It provides a 50kA interrupting capacity at 250VDC, 500VDC, and 750VDC.
Is this molded case circuit breaker suitable for reverse feed applications?
Yes, the Siemens 3VA5212-5EC31-0AA0 is reverse feed capable. Power can be supplied to either the top or bottom terminals without compromising the breaker's protective functions.
Is this 125A Siemens breaker HACR rated?
Yes, it carries an HACR rating, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires group motor protection.
Is the 3VA5212-5EC31-0AA0 a current-limiting circuit breaker?
Yes, this 3VA5 series breaker is current-limiting. It is designed to quickly interrupt high fault currents, reducing the let-through energy and protecting downstream equipment from severe thermal and mechanical stress.
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Reviews
Review summary
Customers rate this product 4.8 out of 5 based on 8 reviews.
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Rating
8 reviews
- EAEdward A.Verified BuyerReviewingSiemens 3VA5112-5EC31-0AA0 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26Quick Shipping
Instock and quick free shipping over a $100
- JFJustin F.Verified BuyerReviewingSiemens 3VA5450-5EC31-0AA0 - 500A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/2/26SIEMENS BREAKER WAS SENT NEXT DAY...
ORDER CAME WHEN IT WAS PROMISSED AND WAS CORRECT... HAPPY CUSTOMER.
THANK YOU,
JUSTIN
- GMGary M.Verified BuyerRated 4 out of 5 stars6/19/26Hard to find Siemens breaker
Great product at a fair price
- RJRene J.Verified BuyerReviewingSiemens 3VA5212-6EF31-0AA0 - 125A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars4/13/26Siemens 3VA5212-6EF31-0AA0
Item arrived quickly and in perfect condition
- DTDENNIS T.Verified BuyerReviewingSiemens 3VA5220-6ED31-0AA0 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/15/26Breaker Purchase
Great price and fast shipment