The diode box is an accessory mainly for PU500 models but can be used with any other DC/DC converter or power supply. The advantage of using the diode box is that the series diode thermal losses can be put outside the converter and there is no need to derate the output current.

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The PU500 models do not have built-in series diodes as a standard feature. To achieve redundancy, we can either supply this diode box or use a built in series diodes.  When built in series diodes is used output current is derated. How much derating, depends on model.

	Diode box 24V	Diode box 28 - 110V	Diode box 90-300V
No of Diodes	2	2	2
Max voltage	30Vd.c.	130Vd.c.	300Vd.c.
Max current per diode	21A	14A	12A
Operating temperature range	-25 - +55°C	-25 - +55°C	-25 - +55°C
Dimension (H x W x D)	48x106x189mm	48x106x189mm	48x106x189mm
Isolation input/output to case	2.5kVd.c.	2.5kVd.c.	4.0kVd.c.
Weight	0.47kg	0.47kg	0.47kg

Series diode box used to parallel two DC/DC converters, one AC/DC and one DC/DC or two AC/DC outputs to achieve redundant output.


Series diode box used to parallel two different battery supply for redundant input.