Accessories
4.2 Internal accessories
3VA molded case circuit breakers with UL and IEC certification
156 Manual, 01/2019, L1V30435333-01
Auxiliary and alarm switches
The auxiliary and alarm switches for the 3VA UL molded case circuit breaker form a single
family. They can be installed in all sizes of all circuit breakers up to 600 A.
The auxiliary and alarm switches can be very simply snapped into place and connected up in
accessory compartments provided on the front panel of the unit to the left and right of the
handle.
All auxiliary and alarm switches are designed as changeover contacts and therefore provide
a high degree of flexibility for planning and installation purposes.
The switches are available in two versions: High Quantity (HQ) and High Power (HP). HQ
switches are 7 mm wide, and HP switches 14 mm wide.
Both switch versions can be combined extremely flexibly in a molded case circuit breaker.
This level of compatibility means that two HQ switches can be optionally installed in place of
one HP switch.
HQ and HP switches have the same functionality, but differ in terms of the following features:
● Connection technology
– HQ: One conductor per contact point
– HP: Two conductors per contact point possible (two screw terminals support one
internal contact point)
● Key electrical data
– HQ: max. 300 V AC, max. 6 A
– HP: max. 600 V; max. 10 A
Individual key electrical data can be found at the end of this chapter.
All HQ switches are also available in a version suitable for lower-level electronic signals
(HP_el).
The auxiliary switches suitable for electronics (HQ_el) are specially optimized for switching
small voltages and currents. They are thus especially well suited to digital inputs and outputs
in the environment of PLC controllers.
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