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Siemens BL series 20A single-pole bolt-on breaker, grey toggle, compact rectangular body

SIEMENS

SIEMENS B120HH Miniature Circuit Breaker BL Series 20A 1 Pole 120/240V AC

SKU CH-6GE7-EABTE

Protects 20 A single-phase circuits with a 65 kA interrupting rating at 120 V AC in Siemens P1 panelboards

  • 20 A single-pole protection for 120/240 V AC circuits
  • 65 kA interrupting rating at 120 V AC
  • Bolt-on mounting fits Siemens P1 panelboards
  • Lug terminals accept 14 AWG copper or 12 AWG aluminium
  • Compact 1 × 3 × 4 in frame for space-saving installation

SIEMENS BL Series 20A Single-Pole Breaker

This SIEMENS B120HH miniature circuit breaker provides 20 A overcurrent protection for single-phase 120/240 V AC branch circuits. It is designed for bolt-on installation in compatible Siemens P1 panelboards and load centers. The unit carries a 65 kA interrupting rating at 120 V AC.

Bolt-On Mounting and Lug Terminals

The bolt-on mounting style secures the breaker firmly to the panelboard bus, while the lug terminal accepts copper conductors down to 14 AWG and aluminium conductors down to 12 AWG. These features determine how the device integrates into the enclosure and which wire sizes can be terminated directly.

Verify Panelboard Series and Voltage Before Ordering

Confirm that the target panelboard is a Siemens P1 series unit rated for 120/240 V AC single-phase service. The breaker is not rated for DC applications and requires a 1-pole space in a 125 A BL frame. Buyers needing multi-pole protection or a different interrupting rating should select another device.

How it compares

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

Price $129.99
Pricier than about 74% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSIEMENS

Questions about this item

Will the lug terminal on the BL series breaker need periodic re-torquing?

The lug terminal accepts 12 AWG aluminium or 14 AWG copper wire; follow Siemens torque values at installation and inspect during routine panel maintenance.

What is the maximum fault current the B120HH can interrupt before it must be replaced?

The breaker carries a 65 kA AIR rating at 120 V AC; any fault exceeding that level would require breaker replacement.

How warm does the 20 A single-pole unit get when loaded continuously inside a P1 panelboard?

Rated for 120/240 V AC operation in a 125 A frame; normal temperature rise stays within UL limits for continuous 20 A loading.

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