I added this board to my portable cabinet that contains a three-voltage power supply.   The CGS 63 Power Supply Delay:

The Power Supply Delay is a support module of sorts. Due to rather heavy usage of bypass capacitors in the synth and diy scene (a good thing) some shortcomings of commercial power supplies have come to light. The most frequent is the failure of one or both power rails to come up at power-on, caused by the initial demand of all the bypass capacitors. The power supplies sense this as an overload and shut down.

If modules were brought on-line in groups instead of all at once, the power-up surges would be limited to what the power supply can handle. Of course, once a group of modules has started, its current demands are less, allowing ample capacity for the supply to start another group of modules.

The Power Supply Delay does exactly that. After a predetermined time, it closes a set of relay contacts, powering the modules connected to it.

I built the CGS-63 with two 5-volt relays, taking advantage of the 5-volt power supply. The CGS-63 receives power input from a 6-pin connector and cable from the MOTM-990 power distribution board.  The purpose is to allow full utilization of the +/-15V supplies, should I encounter the start-up issue with a particular load-out of the cabinet.  It also adds five 4-pin power connectors and two 6-pin connectors, all of which are powered after the delay time, which is adjusted to about 500 milliseconds.