Built for demanding electrical systems, the Square D QDA221501 is a 150A, 2-pole molded case circuit breaker from the PowerPacT Q-Frame series. Equipped with an I-Line mounting bracket, it easily plugs into Square D I-Line panelboards and switchboards. This model is an exact replacement for the discontinued Q221501 breaker. The breaker provides a 25kAIC rating at 240VAC and utilizes fixed thermal-magnetic trip technology (LI). It is configured with an AB phase connection.
Which panelboards are compatible with the QDA221501 circuit breaker?
This breaker features an I-Line plug-on connection and is designed exclusively for use in Square D I-Line panelboards and switchboards. It will not fit NQ, NF, QO, or Homeline load centers.
What does the 1 at the end of the QDA221501 catalog number indicate?
The 1 indicates that this 2-pole breaker is configured for an A and B phase connection on the I-Line bus.
What is the difference between Square D QDA, QGA, and QJA circuit breakers?
The difference lies in their interrupting ratings. The QDA series is rated for 25kA at 240VAC, while the QGA is rated for 65kA, and the QJA is rated for 100kA at the same voltage. They share the same physical Q-Frame footprint and I-Line mounting.
Is the QDA221501 a direct replacement for older Square D breakers?
Yes, the PowerPacT Q-Frame QDA221501 is the direct replacement for the discontinued Square D Q221501 circuit breaker.
Can the QDA221501 be reverse fed?
Yes, Square D Q-Frame thermal-magnetic circuit breakers are suitable for forward or reverse feeding. When backfeeding an I-Line panelboard, ensure the breaker is properly labeled as a main breaker in accordance with local electrical codes.
Are the trip settings on the QDA221501 adjustable?
No, this breaker features a fixed thermal-magnetic trip unit. Both the long-time (thermal) and instantaneous (magnetic) trip functions are factory-set and non-interchangeable.
What wire sizes and materials are accepted by the standard lugs on the QDA221501?
The standard mechanical lugs on the load side of this breaker accept aluminum or copper (Al/Cu) wire ranging from 4 AWG to 300 kcmil.
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Customers rate this product 5.0 out of 5 based on 6 reviews.