Installation
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2021 KEB America, Inc.
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5.4.1.3 DC Side Switching with External MOV
When the brake is de-energized via the DC side switching, some of the energy stored in
the magnetic coil of the brake is absorbed by the varistors in the rectifier. High cycle rates
together with large brake coils can result in an overload of the rectifier. In this case an
external MOV should be used connected in parallel to the brake as shown below. The
voltage rating of the MOV is dependent on the supply voltage of the rectifier.
Figure 12 Rectifier Wiring: External MOV
The following MOVs are recommended for use with the listed supply voltage.
Supply Voltage
KEB Material Number
Varistor Voltage
120V, 208V, 230V, 240V
0090045-2753
275VACrms
400V, 480V
0090045-6255
625VACrms
Rectifier Model
0691010-001U
