The difference is in the construction. The non-plug-in type is shallower in depth with the wiring connected to the contact block by screw terminals. To replace the contact block, remove the wiring. In the plug-in type the depth is deeper with the conduit entry in the back half, along with with screw terminals in a socket. The contact block has stabs that plug into the socket. To replace the contacts, remove the contact block without removing the wiring.
CTA-ID : 2046331
CTA-ID : 2046331