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BCD.00989 Rev A, 14-Jun-2021

Page 9 of 16

RCM60 Series

60 W DC-DC Converters

© 2021 Bel Power Solutions & Protection

Description of Options

General conditions:

- T

Option D: Output Voltage Monitor

Option D encompasses an output voltage monitor by a solid state relay. When V

(connecting OK1 with OK2). Max. data of relay contacts: 0.2 A /120 VDC

Note: The trigger levels are typ. ±5 % of V

Option Q: ORing FET for Redundant Systems

The outputs of 2 parallel connected converters are separated with ORing diodes (built by FETs). If one converter fails, the

remaining one must be capable to still deliver the full power to the load. If more power is needed, the system may be extended to

more parallel converters (n+1 redundancy).

Current sharing must be ensured by load lines of equal section and length. In addition, a slight droop characteristic of the output

voltage and a negative temperature coefficient improve the load sharing as well.

To keep the losses as small as possible, the ORing diode is replaced by a FET. The voltage drop is approx. 22 mV (not dependent of I

Note: In the case of a failing converter, the output voltage is maintained by the redundant converters. However, the failing item should be

identified and replaced. We recommend the Out OK function (option D).

Option F: Incorporated Fuse

The railway standard EN 50155 disadvises fuses in the converters. Consequently, the installer must preview an external fuse or

circuit breaker. However, when this is not possible, an incorporated fuse is available (option F). This fuse is not accessible and will

not trip, except if the converter is defect.

Note: Converters with option F are protected against input reverse polarity by a series FET.

Table 4: Recommended external fuses (same as incorporated with option F)

Converter

Specification

12RCM60

15 A fast acting

XRCM60

8 A fast acting

Option K: Pluggable Connectors

This option allows the use of pre-assembled pluggable connectors; for details see Accessories.

Note: Female connectors must be ordered separately.