Service and maintenance
7.4 Enclosure, terminals, and control panel
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
213
Enclosure, terminals, and control panel
7.4.1
Checking and cleaning the housing
Follow the safety instructions in Chapter Safety instructions (Page 11).
Checking and cleaning the housing
1. Remove dust, traces of oil, and leaked lubricant with a clean and dry cloth.
In the case of severe contamination, you can use a cleaning agent such as
Henkel 273471, Chemma 18 or an equivalent cleaner.
2. Remove all foreign bodies that are on or next to the circuit breaker or the guide frame.
3. Check whether the labels with the technical data are still affixed and legible.
Clean the labels if necessary with a clean, dry cloth.
4. Check the enclosure for damage (visual inspection).
Checking connections and installation
Check the connections
1. Remove dust and dirt from the terminals with a dry brush or cloth. If necessary, you can
use a mild cleaning agent.
In the case of severe contamination, you can use a cleaning agent such as
Henkel 273471, Chemma 18 or an equivalent cleaner.
2. Check that the terminals do not exhibit any signs of overheating.
One indication of overheating is discoloration in the region of the contacts (without
overheating: bright silver).
3. Check that the connections are firmly secured. If necessary, retighten the connections
with the specified tightening torque (see Chapter Tightening torques at a glance
(Page 164)).
Check installation in the control panel
1. Check that the circuit breaker is securely fastened (fixed-mounted breaker) or that the
guide frame is securely fastened in the control panel.
2. Check correct fastening of the accessories mounted in the control panel (locking device,
cover frame, etc.).
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