SIEMENS
SIEMENS B320H Miniature Circuit Breaker BL 20A 3 Pole 240V AC 22kA
Three-pole miniature circuit breaker rated 20 A at 240 V AC with 22 kA interrupting capacity for Siemens P1 panelboards
- 20 A rating protects standard three-phase circuits
- 22 kA interrupting capacity handles high fault currents
- Bolt-on mounting fits Siemens P1 panelboards directly
- Three-pole design breaks all phases simultaneously
- 240 V AC rating matches common commercial supply
Siemens B320H Circuit Breaker Overview
The Siemens B320H is a BL series miniature circuit breaker rated at 20 amps with three poles for 240V AC systems. It provides standard overcurrent protection for commercial and residential electrical panels. The unit features a bolt-on mounting style and toggle actuator for secure installation in compatible load centers. Electricians and facility managers use it for branch circuit protection in three-phase applications.
Interrupting Capacity and Voltage Limits
This breaker delivers a maximum AIR rating of 22kA at 240V AC, defining its short-circuit interrupting capability. It carries no DC voltage rating, restricting use to alternating current circuits only. The frame size is 125A/BLH, setting the upper boundary for the breaker family. Terminal connections accept a minimum of 12 AWG aluminium or 14 AWG copper conductors for safe termination.
Bolt-On Installation and Panel Compatibility
Installation requires a Siemens P1 panelboard or load center, as the bolt-on design mates directly with that series bus structure. The three-inch length and width fit standard BL pole spacing, while the four-inch depth clears typical enclosure gutters. Misalignment with non-P1 bus bars is the most common error, followed by undersized lug torque on aluminium wire. Verifying the panel series before mounting avoids rework.
Highlights
- 20 A rating protects standard three-phase circuits
- 22 kA interrupting capacity handles high fault currents
- Bolt-on mounting fits Siemens P1 panelboards directly
- Three-pole design breaks all phases simultaneously
- 240 V AC rating matches common commercial supply
Specifications
| Brand | SIEMENS |
|---|
Questions about this item
Should I choose the 20 A version or a different amperage for my three-phase circuit?
Choose the 20 A rating when your load calculation and upstream protection require exactly 20 amperes per pole; the breaker is offered in this single current rating for the BL series frame.
What does the 22 kA rating mean once the breaker is installed in a panel?
It means the breaker can safely interrupt up to 22 000 amperes of prospective fault current at 240 V AC without damage, protecting downstream wiring and equipment.
Does the bolt-on mounting work with any 240 V panel or only specific Siemens models?
The bolt-on design is made for Siemens P1 panelboards and load centers; it will not fit panels that require plug-in or DIN-rail mounting styles.
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