LEESON Chassis Mount PWM Control: 175292.00 - Manual (Page 13)

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Heat sinking
175291.00 and 175292.00 drives are pre-mounted on a heat sink.
For optimum heat transfer, mount the drive with heatsink fins
standing vertically as shown in Figure 3 below.
Fuse / Circuit breaker protection
All LEESON drives should be protected by a fuse or circuit breaker.
Use a fast acting fuse or circuit breaker rated for approximately
200% of the maximum armature current and armature voltage.
Connect the fuse or circuit breaker to the VDC+ IN side of the DC
voltage input.
Installation
Figure 3. Heatsink mounting
Heatsink Fins