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Only a Square D designed breaker can be installed in a Square D manufactured panel.
No, the Square D designed breaker can only be installed in a Square D manufactured panel.
No, if you have a Square D distribution panel only Square D breakers will fit in it.
Breakers are build to snap onto a buss bar in a breaker panel. If they look the same on the back end then they will likely work. If not do not try to force a fit. To add a little more to this: 1st of all it depends on what kind of Square D you are talking about. Square D Homline breakers will fit in a GE panel but GE breakers will not fit into a Homeline panel in my experience. Square D QO is not compatible with either.
According to Square D, it accepts bolt-ons and plug-ins. I'm not much of a Square D guy, so I can't tell you for sure. Check the related link for the PDF containing this information.
No, only Sq D breakers will fit into a Sq D panel. I believe Square D makes at least two styles of breakers. Home and industrial. I have a GE entrance/distribution box that has Square D (home), Murray, Bryant, Westinghouse, and GE breakers, all working together. I hope this helps.
It probably wont fit. But if it does there should be no other reason why it wouldn't work.
John D. Keane has written: 'Systems and Specifications'
Legally, you must use the same brand breaker with the brand panel. They sell Murray breakers at your area electrical contractor shop, but used I am sure. However, square d homeline, siemens ite, GE, cutler hammer BR do fit but will void the UL listing and are dangerous to mix. Upgrade your panelboard. It is old.
A QP type breaker is made by Siemens for a Siemens distribution panel and should not be interchanged with Square D. A Siemens QP type bolt in breaker will bolt into a SQ distribution panel but it is up to the electrical inspector to make the call as to it being safe or not. Square D breaker types are QO and QB. You might be mistaking the QP for a QB on the breaker. The QO breaker is a plug in breaker usually used in home wiring and the QB is a bolt in breaker. QB breakers are usually specified for industrial and commercial use.
See discuss question below
Many panels do not have a ground buss. Look for a set of screws mounted directly on the back of the panel adjacent to the breaker outputs. These are to be used for the ground wires. Square D panels are one of many that use this configuration.