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Accessories
4.4 Plug-in and draw-out technology
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
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Plug-in and draw-out technology for 3VA UL
The following describes the interplay of plug-in and draw-out technology and 3VA UL molded
case circuit breakers. However, the 3VA UL molded case switch (MCS) and motor circuit
protector (MCP) types can also be implemented with plug-in or draw-out technology. The
information given below also applies analogously to these device types.
WARNING
Arcing hazard
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.
Before inserting or withdrawing the molded case circuit breaker into or from the socket, use
the handle to switch it to the OFF position. In order to prevent operating errors, 3VA UL
molded case circuit breakers are equipped with an autotrip plunger when they are converted
to plug-in or draw-out technology. This plunger immediately trips the molded case circuit
breaker (circuit breaker position TRIP) and thus opens the main contacts whenever an
attempt is made to withdraw a switched-on molded case circuit breaker (circuit breaker
position ON) or turn ON a breaker which is not properly engaged with a base.