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Siemens B320HH Molded Case Circuit Breaker
- 20A
- 3 Pole
- Bolt-On
Siemens
B320HH
Molded Case Circuit Breaker
Brand
Siemens
SKU
B320HH
Quantity
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Siemens B320HH - 20A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for high-fault environments, the Siemens B320HH is a 3-pole, 20A molded case circuit breaker delivering an impressive 65 kAIC interrupting capacity at 240VAC. It provides robust thermal-magnetic protection for commercial distribution systems. This bolt-on breaker is compatible with Siemens P1, P2, and P3 panelboards. It includes Insta-Wire connectors for faster installation and supports reverse-feed applications. The unit is fully HACR rated for HVAC equipment loads.Specifications
| Brand | Siemens |
|---|---|
| Part Number | B320HH |
| Series | B |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Siemens P1, P2, P3 Panelboards |
| Wire Gauge | 14-10 AWG (Cu), 12-10 AWG (Al) |
| Max Wire | 10 AWG |
| Min Wire | 14 AWG (Cu), 12 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 |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, UL 489 |
| Approval | CSA, HACR, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Common Trip, Reverse Feed, Extra High Interrupting Capacity, Insta-Wire |
Product FAQs
6 answersWhich panelboards are compatible with the Siemens B320HH circuit breaker?
The B320HH is designed for use in Siemens P1, P2, and P3 series commercial panelboards. Because it uses a bolt-on mounting connection, it is not compatible with standard residential load centers that require plug-on breakers.
Is the Siemens B320HH suitable for use with HVAC equipment?
Yes, this breaker is fully HACR rated, meaning it has been tested and approved for the unique electrical demands of heating, ventilation, and air conditioning equipment loads.
Can the Siemens B320HH be used in reverse-feed applications?
Yes, this breaker supports reverse-feed applications, allowing it to be back-fed when used as a main or subfeed device in compatible panelboards.
What is the difference between the B320, B320H, and B320HH breakers?
These breakers share the same physical footprint but have different interrupting capacities. The standard B320 (Type BL) is rated at 10kAIC, the B320H (Type BLH) is rated at 22kAIC, and the B320HH (Type HBL) offers an extra-high interrupting capacity of 65kAIC at 240VAC.
What wire sizes are accepted by the lugs on the B320HH breaker?
The terminal lugs accept 14 to 10 AWG copper (Cu) wire or 12 to 10 AWG aluminum (Al) wire. Always ensure the connections are tightened to the specific torque values printed on the breaker label to prevent overheating.
How does the thermal-magnetic trip unit on the B320HH operate?
The fixed thermal-magnetic (LI) trip unit provides dual protection. The thermal component responds to prolonged overloads by heating a bimetallic strip, while the magnetic component provides instantaneous tripping during severe short-circuit faults.
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