Siemens B2125HH Miniature Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Quantity
Siemens B2125HH - 125A 2 Pole Miniature Circuit Breaker
New
Quantity
Description
Designed for high-fault environments, the Siemens B2125HH provides 125A of thermal-magnetic protection. This two-pole HBL series breaker delivers exceptional performance for commercial and industrial electrical distribution systems. It mounts into Siemens P1, P2, P3, P4, and P5 panelboards via a reliable bolt-on connection. The unit accepts 2-1/0 AWG copper or 1/0-2/0 AWG aluminum wiring. Rated at 65 kAIC at 120/240VAC, this HACR-rated breaker features fixed thermal and magnetic trip settings.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B2125HH |
| Series | HBL |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 65kA @ 120/240VAC |
| Frame Type | B |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P1, P2, P3, P4, P5 Panelboards |
| Wire Gauge | 2-1/0 AWG (Cu), 1/0-2/0 AWG (Al) |
| Max Wire | 1/0 AWG (Cu), 2/0 AWG (Al) |
| Min Wire | 2 AWG (Cu), 1/0 AWG (Al) |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| 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, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated |
Product FAQs
8 answersWhich Siemens panelboards are compatible with the B2125HH circuit breaker?
The B2125HH is a bolt-on breaker designed for use in Siemens P1, P2, P3, P4, and P5 commercial panelboards. It is not compatible with standard residential plug-on load centers.
Can I install the B2125HH in a standard Siemens residential load center?
No. The B2125HH is a bolt-on breaker intended for commercial panelboards. Standard Siemens residential load centers require plug-on breakers, such as the QP series.
What does the "HH" in the B2125HH catalog number indicate?
The "HH" designates it as an HBL series breaker with an extra-high interrupting rating of 65kAIC at 120/240VAC. For comparison, the standard B2125 is a BL series rated at 10kAIC, and the B2125H is a BLH series rated at 22kAIC.
Are there lower AIC alternatives to the B2125HH if my system does not require 65kAIC?
Yes. If your fault current requirements are lower, you can use the B2125H (BLH series) rated at 22kAIC, or the standard B2125 (BL series) rated at 10kAIC, provided they meet your panel specifications.
What wire sizes and materials are accepted by the B2125HH lugs?
The load side lugs accept 2 AWG to 1/0 AWG copper wire, or 1/0 AWG to 2/0 AWG aluminum wire.
How does the B2125HH mount into the panelboard?
It features a bolt-on mounting design, securing directly to the bus bar of compatible Siemens P-series panelboards using screws. This provides a secure, vibration-resistant connection typical in commercial and industrial applications.
What type of trip unit does the B2125HH utilize?
It uses a fixed thermal-magnetic trip unit providing Long-Time (L) and Instantaneous (I) protection. The thermal element protects against overloads, while the magnetic element protects against short circuits.
Is the Siemens B2125HH suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is approved for use with heating, air conditioning, and refrigeration equipment that requires this specific certification.
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