Siemens B345HH Miniature Circuit Breaker
- 45A
- 3 Pole
- Bolt-On
Quantity
Siemens B345HH - 45A 3 Pole Miniature Circuit Breaker
New
Quantity
Description
Built for demanding commercial applications, the B345HH delivers extra-high interrupting capacity. This 3-pole, 45A miniature circuit breaker features thermal-magnetic trip technology for reliable overcurrent protection. The device mounts into Siemens P1 through P5 panelboards using a secure bolt-on connection. It accommodates 8-6 AWG copper or 8-4 AWG aluminum conductors. With a robust 65kAIC rating at 240VAC, this HBL-type breaker safely clears severe short circuits and is HACR rated.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B345HH |
| Series | BL |
| Amperage | 45A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 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 |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens B345HH circuit breaker?
The B345HH is designed for use in Siemens P1, P2, P3, P4, and P5 panelboards. It features a bolt-on connection to securely mount directly to the panel bus.
What does the HH suffix in the B345HH catalog number indicate?
The HH designates this as an HBL type breaker within the Siemens BL series. This indicates an extra-high interrupting rating of 65kAIC at 240VAC, compared to standard BL breakers at 10kAIC or BLH types at 22kAIC.
What wire sizes are accepted by the lugs on the B345HH breaker?
The terminals on this 45A breaker accommodate 8 to 6 AWG copper conductors or 8 to 4 AWG aluminum conductors. Ensure proper torque specifications are followed during installation.
What type of overcurrent protection does the B345HH provide?
This breaker uses a fixed thermal-magnetic trip unit. It provides long-time protection against mild overloads and instantaneous protection to quickly clear severe short circuits.
Is the B345HH considered an HBL type breaker?
Yes, the B345HH is classified as an HBL type breaker within the Siemens BL family. The HBL designation specifically refers to its 65kAIC interrupting capacity at 240VAC.
Is the B345HH suitable for 3-phase applications?
Yes, this is a 3-pole breaker designed for 3-phase electrical distribution systems operating at a maximum of 240VAC.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 35 reviews.
- TSTom S.Verified BuyerReviewingSiemens B3100 3 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars8/3/26Superbreakers is our go to!
Great prices, great service and quick delivery.
- MGMaggie G.Verified BuyerReviewingSiemens B250 - 50A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/24/26Great Service
Came in great condition and in an incredibly timely manner. Will continue superbreakers for all of my orders in the future!
- DBDonnie B.Verified BuyerReviewingSiemens B115 - 15A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/11/26New Breaker
Awesome breaker & Superbreakers is a awesome company!
- BLBrian L.Verified BuyerReviewingSiemens B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/4/26Brian
Works great
- JFJoseph F.Verified BuyerReviewingSiemens B120 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars3/23/26Great value
It was a great value