Square D A1L350 Circuit Breaker
- 50
- 3 Pole
Quantity
Square D A1L350 3 Pole Circuit Breaker
Re-Certified
Quantity
Description
Square D A1L350 3 Pole Circuit Breaker
The Square D A1L350 is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 50 Amps and a voltage rating of 240VAC, 48VDC. It has an interrupting rating of 10kAIC at 240V. The A1L350 has a bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
Product FAQs
6 answersIs the Square D A1L350 still manufactured, or is there a direct replacement?
The A1L350 is a legacy circuit breaker that is no longer in active production. For a modern equivalent, the Square D QOU350 serves as the direct replacement for 3-pole, 50-amp unit-mount applications.
How is the A1L350 installed in an electrical system?
The A1L350 features a unit-mount, feed-thru design. It bolts directly to a backpan, DIN rail, or enclosure using mounting brackets, rather than plugging onto a traditional panelboard bus bar. Line and load connections are made via the integrated box lugs.
Is the A1L350 rated for direct current (DC) systems?
Yes, alongside its standard AC ratings, the A1L350 carries a 48VDC rating. This makes it suitable for low-voltage DC control panels, battery backups, and industrial DC distribution.
Can the A1L350 be installed in a standard Square D QO or Homeline load center?
No. The A1L350 is a unit-mount breaker designed for OEM panels and standalone enclosures. It lacks the plug-on or bolt-on bus clips required for QO, QOB, or Homeline residential and commercial panelboards.
How does the thermal-magnetic trip unit in the A1L350 operate?
The thermal-magnetic mechanism provides dual-level protection. The thermal element offers a delayed trip for sustained overloads, preventing nuisance trips from temporary motor inrush currents. The magnetic element provides an instantaneous trip response to clear severe short circuits.
What wire sizes are accepted by the A1L350 box lugs?
The standard box lugs on the A1L frame typically accommodate 14 AWG to 2 AWG copper or aluminum conductors. Electricians must ensure proper torque is applied according to the label specifications to prevent high-resistance connections.
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