Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with UL and IEC certification
230 Manual, 01/2019, L1V30435333-01
As described above, two screw-mounted terminal covers are included in the plug-in socket
complete kit and the plug-in socket conversion kit. These feature molded grips to ease
withdrawal of the molded case circuit breaker from its socket. Since more force is needed to
remove a molded case circuit breaker from its socket, the plug-in technology terminal covers
are screwed to the molded case circuit breaker.
If the terminal area of the plug-in socket needs to be protected by terminal covers, a variety
of terminal covers are available to order as options for this purpose. The circuit breaker
terminal covers and insulation materials can be used because direct mounting on the plug-in
base is also possible.
An autotrip plunger comes with every plug-in technology complete kit and every plug-in
technology conversion kit for the 3VA UL molded case circuit breaker. The plunger performs
safety functions in operation.
When a molded case circuit breaker is converted to a molded case circuit breaker for plug-in
technology, this plunger is installed from the rear of the device and latched. The plunger
performs safety functions in operation. It prevents the molded case circuit breaker from being
switched to the ON position if the breaker is not correctly bolted to the socket. For further
information, see also section "Signal 'Plug-in unit - MCCB correctly bolted to plug-in socket'"
in chapter Position signaling switches (Page 244).
Insertion and withdrawal of the 3VA UL molded case circuit breaker in switched-on state
(circuit breaker position ON) leads to formation of arcs between contacts and can result in
irreparable damage to the molded case circuit breaker and electrical installation as well as
bodily injuries.
Install an auto-trip plunger in all 3VA UL molded case circuit breakers before inserting into
a plug-in or draw-out base. Always turn the circuit breaker OFF before removing from a
plug-in or draw-out base.
Note the color coding and labels for the autotrip plunger:
• Plug-in technology: Black, labeled "Plug-in"
• Draw-out technology: Grey, labeled "Draw-out"
The autotrip plunger cannot be removed from the circuit breaker after installation.
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