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Siemens B340 Molded Case Circuit Breaker
- 40A
- 3 Pole
- Bolt-On
Siemens
B340
Molded Case Circuit Breaker
Brand
Siemens
SKU
B340
Quantity
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Siemens B340 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
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Siemens B340 - 40A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | B340 |
| Series | B |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Insta-Wire |
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Siemens B340 - 40A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | B340-R |
| Series | B |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Insta-Wire |
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Description
Engineered for commercial distribution systems, the Siemens B340 is a 40A, 3-pole molded case circuit breaker. Providing a 10kAIC rating at 240VAC, this BL series breaker utilizes thermal-magnetic trip technology for reliable LI protection. It features a bolt-on mounting configuration that fits securely into Siemens P1, P2, and P3 panelboards. With an HACR rating and included load side lugs, it offers a versatile solution for standard branch circuit applications.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B340-R |
| Series | B |
| Amperage | 40A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 240VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 8-6 AWG (Cu), 8-4 AWG (Al) |
| Max Wire | 6 AWG (Cu), 4 AWG (Al) |
| Min Wire | 8 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Available Options | Shunt Trip, Auxiliary Switch, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Insta-Wire |
Product FAQs
7 answersCan I install the Siemens B340 in a standard residential load center?
No. The B340 is a bolt-on circuit breaker designed for commercial and industrial panelboards, such as the Siemens P1, P2, and P3 series. It is not compatible with residential plug-on load centers that require Type QP breakers.
What panelboards are compatible with the B340 breaker?
This B-frame breaker is designed specifically for use in Siemens P1, P2, and P3 commercial panelboards.
How does the B340 connect to the panelboard bus?
It features a direct bolt-on connection that mounts securely to the panelboard branch bus, providing a vibration-resistant electrical connection.
What size and type of wire can be used with this breaker's lugs?
The factory-installed lugs accept 8 to 6 AWG copper (Cu) conductors, or 8 to 4 AWG aluminum (Al) conductors.
What type of overload protection does the B340 provide?
This breaker utilizes a fixed thermal-magnetic trip unit to deliver long-time overload protection and instantaneous short-circuit protection.
Is the thermal-magnetic trip unit on the B340 adjustable?
No. The thermal-magnetic trip settings on this B-frame breaker are fixed at the factory for its 40A continuous current rating and cannot be adjusted in the field.
Are there higher interrupting rating alternatives to the standard 10kAIC B340?
Yes. If your electrical system requires a higher interrupting capacity, Siemens offers the B340H rated for 22kAIC, and the B340HH rated for 65kAIC at 240VAC.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 3 reviews.
Total 5 star reviews: 3 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
3 reviews
- ARAlex R.Verified BuyerRated 5 out of 5 stars4/17/26Great product and service
Great products and service
- CPChristopher P.Verified BuyerRated 5 out of 5 stars9/1/25First time buyer. Will be back.
Competitive pricing and fast shipping.
- KYKenneth Y.Rated 5 out of 5 stars9/8/18Owner
Fast service and good prices!!!!