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Siemens B390 Miniature Circuit Breaker
- 90A
- 3 Pole
- Bolt-On
Siemens
B390
Miniature Circuit Breaker
Brand
Siemens
SKU
B390
Quantity
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Siemens B390 - 90A 3 Pole Miniature Circuit Breaker
New
Quantity
Quantity
Siemens B390 - 90A 3 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Siemens |
|---|---|
| Part Number | B390 |
| Series | B |
| Amperage | 90A |
| 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 | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| 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, Rotary Handle |
|---|---|
| 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, Trip-Free Mechanism |
Sold out
Quantity
Siemens B390 - 90A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Siemens |
|---|---|
| Part Number | B390-R |
| Series | B |
| Amperage | 90A |
| 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 | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| 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, Rotary Handle |
|---|---|
| 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, Trip-Free Mechanism |
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Description
Built for reliable power distribution, the Siemens B390 is a 3-pole, 90A miniature circuit breaker. It operates at 240VAC and utilizes thermal-magnetic trip technology to protect commercial branch circuits from overloads and short circuits. This Type BL breaker features a bolt-on mounting style for secure installation into Siemens P1, P2, and P3 panelboards. It includes load-side lugs that accommodate up to 1/0 AWG conductors. Delivering a 10kAIC rating, the unit is HACR certified.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B390 |
| Series | B |
| Amperage | 90A |
| 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 | 4-1/0 AWG (Cu), 2-1/0 AWG (Al) |
| Max Wire | 1/0 AWG |
| Min Wire | 4 AWG (Cu), 2 AWG (Al) |
| 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, Rotary Handle |
|---|---|
| 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, Trip-Free Mechanism |
Product FAQs
7 answersWhich panelboards are compatible with the Siemens B390 circuit breaker?
The B390 is designed for use with Siemens P1, P2, and P3 panelboards. It features a bolt-on connection for secure mounting directly to the panel bus.
What wire sizes are accepted by the lugs on the B390 breaker?
The load side lugs accept 4 to 1/0 AWG copper wire and 2 to 1/0 AWG aluminum wire.
What does the LI trip function indicate on this breaker?
The LI designation means the breaker uses a thermal magnetic trip unit with Long-Time and Instantaneous protection to guard against overloads and short circuits.
Is the B390 a Type BL circuit breaker?
Yes, the B390 is a Type BL molded case circuit breaker configured specifically for bolt-on panelboard mounting.
Can I install this bolt-on breaker while the panel is energized?
No. Always de-energize the panelboard before installing or servicing bolt-on circuit breakers to prevent electrical shock and arc flash hazards.
Can I use the B390 in a load center that requires plug-on breakers?
No, the B390 has a bolt-on connection type. It cannot be installed in standard residential plug-on load centers.
Is the trip setting adjustable on the Siemens B390?
No, this breaker features a fixed thermal magnetic trip unit. The trip settings cannot be adjusted in the field.
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