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Three-pole Siemens BL miniature breaker with toggle actuators and bolt-on lugs, light-grey plastic body

SIEMENS

SIEMENS B320 Miniature Circuit Breaker BL Series 20A 3 Pole 240V AC 10kA

SKU CH-YREH-QKGAQ

Three-pole miniature circuit breaker rated 20 A at 240 V AC with a 10 kA interrupting capacity for Siemens P1 panelboards

  • 20 A rating protects circuits up to 20 amps
  • Three-pole design switches all three phases together
  • 10 kA interrupting capacity at 240 V AC
  • Bolt-on mounting fits Siemens P1 panelboards
  • Lug terminals accept 14-10 AWG copper or 12-10 AWG aluminium

Three-Pole 20 A Protection

The SIEMENS B320 is a bolt-on miniature circuit breaker rated at 20 A and 240 V AC with a 10 kA interrupting capacity. It fits Siemens P1 panelboards and uses lug terminals for 14 to 10 AWG copper or 12 to 10 AWG aluminium conductors.

Sustained 20 A Operation

The breaker carries its full 20 A rating continuously within the P1 enclosure without nuisance tripping. Its thermal-magnetic mechanism responds to prolonged overloads and clears short-circuit currents up to 10 kA at 240 V AC, maintaining protection during extended fault conditions.

Replaces Single or Double-Pole Units

This three-pole unit replaces separate single-pole or double-pole breakers when three-phase circuit protection is required. The step up is justified when a load demands simultaneous disconnection of all three phases, such as motors or balanced distribution branches.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $347.99
Pricier than about 89% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

How much heat does the B320 breaker generate when carrying 20 A continuously?

The breaker is rated for 20 A at 240 V AC with a 10 kA interrupting capacity; normal operation at full load produces only the heat expected from its internal resistance within the 125 A frame.

What panelboard and wire sizes are required to install this three-pole unit?

It bolts onto a Siemens P1 panelboard and accepts copper wire from 14 AWG to 10 AWG or aluminium wire from 12 AWG to 10 AWG.

Will the BL series breaker coordinate with older 125 A frame breakers already in the same P1 panel?

Yes, it shares the 125 A BL frame size and 10 kA AIR rating at 240 V AC, so it fits the same bus and maintains consistent protection levels.

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