RCM300 Series
300 W Dual Output DC-DC Converter
The RCM300 Series dual output DC-DC converters are
reliable power supplies for railway and transportation
systems. There are 2 input voltage ranges covering all
common railway batteries. The dual output delivers 300 W
at +24 V / - 24 V. The converters are designed for chassis
mounting and exhibit a closed housing with cooling
openings.
Many features are available, such as an output ORing
FET for redundant operation, interruption time of 10 ms
(class S2), shutdown input, and an output voltage monitor
controlling a relay.
FEATURES
• RoHS lead-free-solder product
• 2 input voltage ranges, covering all common railway
batteries
• Dual output +24 V / -24 V
• Closed housing for chassis mounting
• Extremely high efficiency and high power density
• Low inrush current
• 3 connectors: Input, output, auxiliary
• Overtemperature, overvoltage, overcurrent, and overload
protections
• Multiple options available
• Dimensions:116 x 38 x 188.6 mm (4.57 x 1.5 x 4.43 in)
• Compliant to EN 50155, EN 50121-3-2, AREMA
• Fire and smoke: compliant to EN 45545 & NFPA 130
• 5 year warranty
• Safety-approved to IEC/EN 62368-1 and UL/CSA 62368-1
1
1
pending
Table of Contents
Description........................................................................................1
Model Selection.................................................................................2
Functional Description.......................................................................3
Electrical Input Data..........................................................................4
Electrical Output Data.......................................................................6
Description of Options.......................................................................8
Electromagnetic Compatibility (EMC)................................................9
Immunity to Environmental Conditions............................................10
Mechanical Data.............................................................................. 11
Safety and Installation Instructions..................................................12
Accessories.....................................................................................14
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BCD.20202 Rev. 1 09 September 2022
RCM300 Series
Dual Output DC-DC Converter
MODEL SELECTION
Table 1: Standard models
Input voltage
V
[V]
Vi cont
[V]
1
i min
14.4
43.2
Output
16.8
50.4
(24)
(110)
Vi max
[V]
45
137.5
1
52.5
154
Power
Vo nom
[V]
Io nom
[A]
Po nom
[W]
+24
6.25
300
-24
6.25
300
+24
6.25
300
-24
6.25
300
1
Short time; see table 2 for details.
2
Efficiency at TA = 25 °C, Vi nom, Io nom, Vo nom, only option DM fitted.
Efficiency 2
η min
Model
Options
η typ
[%]
90
92
24RCM300-2424DM
Q, F, K
92
93
110RCM300-2424DM
Part Number Description
110 RCM 300 -2424 D M Q F K
Operating input voltage Vi cont (continuously):
16.8 – 45 VDC ............................................................24
50.4 – 137.5 VDC ...................................................... 110
Series..............................................................................RCM
Output power:
300 W ......................................................................300
Nominal output voltage:
+24 / -24 V...............................................................2424
Auxiliary functions and options:
Out OK, interruption time, shutdown........................... DM
Option: ORing FET........................................................Q
Option: Fuse built-in.......................................................F
Option: Pluggable Connectors ..................................... K
Note: The sequence of options must follow the order above.
Note: All models are RoHS-compliant for all six substances.
Available combinations of options:
24/110RCM300-2424DM (K)
24/110RCM300-2424DMQ (K)
24/110RCM300-2424DMQF (K)
Example: 110RCM300-2424DMQ: DC-DC converter, input voltage range 50.4 to 137.5 V continuously, output providing ± 24 V /6.25 A,
monitoring relay, shutdown input, interruption time 10 ms, integrated ORing FET, operating ambient temperature
TA = –40 to 70 °C, RoHS-compliant for all six substances.
Product Marking
Type designation, applicable safety approval and recognition marks, CE mark, pin allocation, and product logo.
Input voltage range and input current, nominal output voltage and current, degree of protection, batch no., serial no., and data code
including production site, version (modification status) and date of production.
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RCM300 Series
Dual Output DC-DC Converter
FUNCTIONAL DESCRIPTION
The converters are designed as active clamp forward converters with a switching frequency of approximately 120 kHz. The built-in
high-efficient input filter together with a small input capacitance generates very low inrush current of short duration. An antiparallel
diode acts as reverse polarity protection together with the external circuit breaker or fuse.
The circuitry providing the interruption time is located after the input filter.
The rectification on the secondary side is provided by synchronous rectifiers, in order to keep the losses as low as possible. The
output voltage control logic is located on the secondary side and influences the primary logic through magnetic feedback.
An auxiliary converter supplies all circuits with a stable bias voltage.
An output ORing FET is available (option Q) and allows for a redundant power supply system. If there are no external circuit
breakers, it is possible to order the converter with incorporated fuse (opt. F). Because this fuse is not accessible, a serial diode
provides reverse polarity protection.
NTC
The converter option DM encompasses an additional auxiliary connector and allows primary shutdown. An output voltage monitor
controls a solid state relay with normally closed contact (OK to OK0)
Primary
control logic
SD
SD0
Vi+
isolated
driver
Secondary
control logic
OK
OK0
Opt. F
NTC
1
2
Vo+
Input
filter
Opt. Q
Vi-
Output
filter
0V
0V
Opt. Q
VoCy
PE
1
Series diode
Auxiliary
Converter
2
Cy
Bipolar supressor diode with option -F
Fig. 1
Block diagram
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RCM300 Series
Dual Output DC-DC Converter
ELECTRICAL INPUT DATA
General conditions:
- TA = 25 °C, unless TC is specified.
Table 2: Input data of RCM300 models
Model
24RCM300
Characteristics
min
typ
max
min
typ
max
(24)
45.0
50.4
(110)
137.5
52.5
43.2
Operating input voltage continuous
Io = 0 – Io max
TC min – TC max
16.8
Vi 2s
for ≤ 2 s
without shutdown
14.4
Vi nom
Nominal input voltage
Vi abs
Input voltage limits
3 s without damage
Ii
Typical input current
Vi nom, I o nom
24, (36)
Pi 0
No-load input power
Vi min – Vi max, Io = 0
Idle input power
Vi min – Vi max, VSD = 0 V
Ci
Input capacitance 1
Ri
Input resistance
Iinr p
Peak inrush current
tinr d
Duration of inrush current
1
2
0
55
4
0
165
6
4
A
6
2
2
Vi = Vi max, P o nom
0 → Vi min, P o nom
Vi min, P o nom
VSD = 0 → 5 V
V
32
W
2
6
Start-up time after removal of shutdown
154
(72), (96), 110
13.9
P i SD
Start-up time
Unit
Conditions
Vi cont
ton
110RCM300
12
µF
140
140
mΩ
120
150
A
0.5
0.5
1000
1000
300
300
ms
Not smoothed by the inrush current limiter at start-up (for inrush current calculation)
Typ. value at Vi max. At lower Vi, the idle and low-load input power are smaller.
Input Transient and Reverse Polarity Protection
A suppressor diode and a symmetrical input filter form an effective protection against input transients, which typically occur in many
installations, but especially in battery-driven mobile applications.
If the input voltage has the wrong polarity, the incorporated antiparallel diode causes the external input circuit breaker or fuse to
trip. With option F (incorporated fuse), an active reverse-polarity protection circuit prevents the internal fuse to trip.
Input Under- / Overvoltage Lockout
If the input voltage is out of range, an internally generated inhibit signal disables the converter to avoid any damage.
Inrush Current and Stability with Long Supply Lines
The converter operates with relatively small input capacitance C i resulting in low inrush current of short duration.
If a converter is connected to the power source through supply lines with reasonable length, no additional measures are necessary
to ensure stable operation.
Only in the case of very long supply lines exhibiting a considerable inductance Lext, an additional external capacitor Cext connected
across the input pins improves the stability and prevents oscillations; see fig. 2.
Table 3: Recommended values for the capacitor Cext
JM085d
Lext
Rext
Vi+
Ri
Converter
Vo+
Cext
Ci
Vi–
Load
+
ri
Vo–
Vi nom
RCM300
Rated voltage
24 V
3000 μF
40 V
36 V
2000 μF
63 V
72 V
440 μF
125 V
110 V
200 μF
200 V
Fig. 2
Input configuration
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RCM300 Series
Dual Output DC-DC Converter
Actually, the RCM Series converter with its load acts as negative resistor r i, because the input current I i rises, when the input
voltage Vi is decreased. It tends to oscillate with a resonant frequency determined by the line inductance L ex t and the input
capacitance Ci + Cext, damped by the resistor R ext. The whole system is not linear at all and eludes a simple calculation. One basic
condition is given by the formula:
Lext • Po max dV i
_________
____
C i + C ext >
(r =
)
Rext • Vi min²
i dI i
Rext is the series resistor of the voltage source including supply lines. If this condition is not fulfilled, the converter may not reach
stable operating conditions. Worst case conditions are at lowest Vi and highest output power Po.
Recommended values for Cext for different batteries are listed in table 3, which should allow for stable operation up to an input
inductance of 2 mH. Ci is specified in table 2.
Efficiency
100
100
95
95
90
90
Efficiency [%]
Efficiency [%]
The efficiency depends on the model and on the input voltage.
85
80
80
75
75
70
85
70
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0.1
0.2
0.3
0.4
Vin=72Vdc
0.5
Vin=24Vdc
Vin=110Vdc
Fig. 3a
Efficiency versus Vi and Po (110RCM300-2424DMQF)
0.6
0.7
0.8
0.9
1.0
Po/Po_nom
Po/Po_nom
Vin=36Vdc
Fig. 3b
Efficiency versus Vi and Po (24RCM300-2424DMQF)
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RCM300 Series
Dual Output DC-DC Converter
ELECTRICAL OUTPUT DATA
General conditions:
- TA = 25 °C, unless TC is specified
Table 4: Output data of RCM300 models.
Output
+24 V
Characteristics
Conditions
typ
max
min
typ
max
24
24.24
23.76
24
24.24
24.72
23.28
V i nom, 0.5 Io nom
23.76
V ow
Worst case output voltage
Vi min – Vi max
TC min – TC max, 0 - Io nom
23.28
V o droop
Output voltage droop
Vo L
Overvoltage shutdown
Vo P
Overvoltage protection 1
Io nom
Nominal output current
Io L
Output current limit
vo
Output noise 2
vod
- 40
28.5
28.5
Switching frequency
V i nom, Io nom
BW = 20MHz
Total incl. spikes
Voltage deviation 4
Dynamic load
regulation
α vo
Temperature coefficient of vo (NTC)
6.5
7.2
6.5
Vi nom ,
0.1 ↔ 0.9 Io nom
Recovery time
0 - Io nom, TC min – TC max
31.5
6.5
7.2
80
80
120
120
1000
1000
5
- 0.02
30
- 0.02
V
A
mVpp
5
0
V
mV/A
28
31.5
6.5
td 3
3
4
5
30
24.72
- 40
28
5
TC min – TC max
Unit
min
Output voltage
Vo
-24 V
ms
0
%/K
Breakdown voltage of the incorporated suppressor diode at 1 mA . Exceeding this value might damage the suppressor diode.
Measured according to IEC/EN 61204 with a probe described in annex A
Recovery time until Vo returns to ±1% of Vo; see fig. 4.
No overshoot at switch on.
Output overvoltage protection by an electronic circuitry.
1
2
Output Voltage Regulation
Line and load regulation of the output is so good that input voltage and output current have virtually no influence to the output voltage.
Vo
Vod
Vo ±1 %
td
Vod
Vo ±1 %
td
t
Io /Io nom
1
0.5
0
≥ 10 µs
≥ 10 µs
05102c
t
Fig. 4
Typical dynamic load regulation of output voltage
Thermal Considerations and Protection
A temperature protection is incorporated in the primary and secondary control logic each. It generates an internal inhibit signal, which
disables the converter in case of overtemperature. The converter automatically recovers, when the temperature drops below the limit.
The relationship between TA and TC depends heavily upon the conditions of operation and integration into a system.
Caution: The installer must ensure that under all operating conditions TC remains within the limits stated in table 8.
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RCM300 Series
Dual Output DC-DC Converter
Output Current Limitation
The outputs are continuously protected against open-circuit (no load) and short-circuit by an electronic current limitation with
rectangular characteristic and automatic recovery. Over current event on one of the outputs has no effect on performance of the
other one. However LED indicator and Output Monitor signal will change its state and will report it as potential problem with one
of the outputs to the operator or application system.
Series and Parallel Connection
The outputs of several RCM Series converters may be connected in series.
Note: If the sum of the output voltages is greater than 60 V, it cannot be considered as ES1 (Electrical energy source class 1) according to
the safety standards.
Several RCM models of the same type can be operated in parallel connection. To ensures proper current sharing, the load lines
should have equal length and section. The output voltage exhibits a slight droop characteristic, which facilitates current sharing.
In addition, the output voltage tends to be lowered with increasing temperature.
Redundant Systems
For redundant systems, we recommend the options Q, see Options.
LED Indicator
The converters exhibit a green LED “Out OK”, signaling that both output voltages are within the specified range.
Output Monitor, Shutdown
Option D consists of auxiliary functions and encompasses an additional auxiliary connector.
Output Voltage Monitor (D)
The output voltage of both outputs is monitored. When outputs are within regulation range, solid state relay contact between OK0 and
OK1 is closed. If output voltages (one of them or both) is for any reason out of regulation range, relay contact OK0 to OK1 is open.
Note: The trigger levels are typ. ±5 % of Vo nom (with open R-input).
Data of relay contacts: 0.18 A /120 VDC max.
Primary Shutdown (SD)
The outputs of the converter may be enabled or disabled by a logic signal (e.g. CMOS) applied between the shutdown pin SD and
SD0 (= Vi–). If the shutdown function is not required, pin SD can be left open-circuit. Voltage on pin SD:
Converter operating:
Converter disabled:
12 to 154 V or open-circuit
– 2 to +2 V
The output response is shown in fig. 5.
Note: In systems consisting of several converters, this feature may be used to control the activation sequence by logic signals or to enable the
power source to start up, before full load is applied.
Vo /Vo nom
1
0.1
0
tr
tf
td on
ton
SD
1
0
t off
t
Fig. 5
Typical output response to the SD-signal.
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RCM300 Series
Dual Output DC-DC Converter
Interruption Time
The interruption time t hu is specified in the railway standard EN 50155:2021 clause 5.2.4. It is tested at the nominal battery voltage
for interruption and short-circuit of the input. After such an event, the system is ready for another such event after 10 s. Fig. 6
shows the output voltage Vo with option M.
t hu = 10 ms (Class S2) in all other cases.
Vo /Vo nom
1
tr
thu
td on
0.1
0
ton
Vi
0
t
Fig. 6
Typical output response to Vi If option M is not fitted, thu = 0 ms.
DESCRIPTION OF OPTIONS
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 are helpful 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 Io).
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 or option M are protected against input reverse polarity by a series diode.
Table 5: Recommended external fuses (same as with option F)
Converter
Specification
Ordering number
24RCM300
30 A fast acting
BEL 0ADE (P) 9300
110RCM300
10 A fast acting
BEL 0ADE (P) 9100
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.
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RCM300 Series
Dual Output DC-DC Converter
ELECTROMAGNETIC COMPATIBILITY (EMC)
Electromagnetic Immunity
Table 6: Electromagnetic immunity (type tests). Corresponds or Exceeds EN50121-3-2:2016 and AREMA
Phenomenon
Standard
Level
Electrostatic
discharge (to case)
IEC/EN
61000-4-2
4
Electromagnetic
field
IEC/EN
61000-4-3
x
Coupling mode 1
Value
applied
contact discharge
6000 Vp
air discharge
8000 Vp
antenna
20 V/m
Waveform
1/50 ns
AM 80% / 1 kHz
Source
imped.
Test procedure
330 Ω
150 pF
N/A
20 V/m
antenna
20 V/m
5 V/m
IEC/EN
61000-4-4
3
3
Surges
IEC/EN
61000-4-5
3
Conducted
disturbances
IEC/EN
61000-4-6
3
Power frequency
magnetic field
IEC/EN
61000-4-8
3
1
2
capacitive, o/c
i/c, +i/–i
direct coupling
±2000 Vp
i/c
±2000 Vp
+i/– i
±1000 Vp
i/c, +i/–i
±2000 Vp
i, o, signal wires
10 VAC
(140 dBµV)
Perf.
crit. 2
10 pos. & 10
neg. discharges
yes
A
80 – 800 MHz
yes
A
yes
A
60 s positive
60 s negative
transients per
coupling mode
yes
A
5 pos. & 5 neg.
surges per
coupling mode
yes
0.15 – 80 MHz
yes
A
60 s in all 3 axis
yes
A
800 – 1000 MHz
AM 80% / 1 kHz
N/A
3 V/m
Electrical fast
transients/burst
In
oper.
1400 – 2000 MHz
2000 – 2700 MHz
5100 – 6000 MHz
bursts of 5/50 ns;
2.5/5 kHz over 15 ms;
burst period: 300 ms
1.2 / 50 µs
50 Ω
42 Ω
0.5 μF
12 Ω
9 μF
AM 80% / 1 kHz
150 Ω
300 A/m
A
B
i = input, o = output, c = case
A = normal operation, no deviation from specs.; B = normal operation, temporary loss of function or deviation from specs possible
Electromagnetic Emissions
All conducted emissions have been tested as per EN 55011, group 1, class A. These limits are much stronger than requested in
EN 50121-3-2:2016, table 2.1, and coincide with EN 50121-4:2016, table 1.1.
The average values must respect a margin of 10 dBµV below the limits for quasi-peak.
Radiated emissions have been tested according to EN 55011, group 1, class A . These limits are similar to the requirements of
EN 50121-3-2:2016 and EN 50121-4:2016, both calling up EN 61000-6-4+A1:2011, table 1.
Note: The highest frequency of the internal sources of EUT is less than 108 MHz. Hence, Radiated Measurement was made up to 1 GHz.
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RCM300 Series
Dual Output DC-DC Converter
IMMUNITY TO ENVIRONMENTAL CONDITIONS
Table 7: Mechanical and climatic stress. Air pressure 800 – 1200 hPa
Test method
Standard
Test Conditions
Ad
Low temperature
start-up test
EN 50155:2021, clause 13.4.4
IEC/EN 60068-2-1
Temperature, duration:
- 40 °C, 2 h
Performance test:
+25 °C
Dry heat test,
cycle A
EN 50155:2021, clause 13.4.5
IEC/EN 60068-2-2
Temperature:
70 °C
Duration:
6h
Cyclic damp heat
test
EN 50155:2021, clause 13.4.8
IEC/EN 60068-2-30
Temperature:
55 °C and 25 °C
Cycles (respiration effect):
2
Duration:
2x 24 h
Be
Db 2
Ka
-
-
-
Not operating
Temperature:
35 ±2 °C
Duration:
48 h
Functional random
vibration test
EN 50155: 2021, clause 13.4.10.4
EN 61373:2010 clause 8,
class B, body mounted 1
Acceleration amplitude:
0.1 gn = 1.01 m/s2
Frequency band:
5 – 150 Hz
Test duration:
30 min (10 min in each axis)
Simulated long life
testing
EN 50155: 2021, clause 13.4.10.2
EN 61373:2010 clause 9,
class B, body mounted 1
Acceleration amplitude:
0.58 gn = 5.72 m/s2
Frequency band:
5 – 150 Hz
Test duration:
15 h (5 h in each axis)
EN 50155: 2021, clause 13.4.10.3
EN 61373:2010 clause 10,
class B, body mounted 1
Acceleration amplitude:
5.1 g n
Bump duration:
30 ms
Number of bumps:
18 (3 in each direction)
AREMA Part. 11.5.1
class C, D, E, I, J
Displacement amplitude:
0.3” (5 – 10 Hz)
0.07” (5 – 20 Hz)
Acceleration amplitude:
1.5 gn = 14.7 m/s2 (10 – 200 Hz)
Frequency:
5 – 200 Hz
Test duration:
12 h (4 h in each axis)
Acceleration amplitude:
10 g n = 98 m/s2
Bump duration:
11 ms
Number of bumps:
18 (3 in each direction)
Mechanical shock
1
Operating
perf. crit. A
EN 50155: 2021, clause 13.4.13
IEC/EN 60068-2-11
Vibration
sinusoidal
-
Not operating
Salt mist test
sodium chloride
(NaCl) solution
Shock test
-
Status
AREMA Part. 11.5.1
class C, D, E, I, J
Converter not
operating
Operating
perf. crit. A
Not operating
Operating
perf. crit. A
Operating
perf. crit. A
Operating
perf. crit. A
Body mounted = chassis of a railway coach
Temperatures
Table 8: Temperature specifications, valid for an air pressure of 800 – 1200 hPa (800 – 1200 mbar)
Temperature
Characteristics
TA
Ambient temperature
TC
Case temperature 1
TS
Storage temperature
1
EN 50155:2021 Class OT4
Unit
Conditions
min
max
10 minutes
Converter operating
- 40
70
85
- 40
90
- 55
85
Not operational
°C
Measured at the measurement point TC (see Mechanical Data)
Reliability
Table 9: MTBF
Calculation method
Model
MTBF
According to IEC 61709 / SN-29500
24 / 110RCM300-2424
300 000 h min
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RCM300 Series
Dual Output DC-DC Converter
MECHANICAL DATA
4.
5
+1
67.75
LED
(4
x)
38 -0.5
98
164.6
188.6
176.6
134.05
LED
12
6
Ø
9
116
WAGO
745-3104
Phoenix Contact
1874027
WAGO
745-353
6.35
11.3
Standard models
15.55
48.43
73.05
Phoenix Contact
1874027
Phoenix Contact
1923995
Weidmuller
1048510000
11.3
48.4
74.2
Fig. 9
Case of RCM300 (RCM02)
weight approx. 820 g, Aluminum, EP-powder coated
18.05
4.9
5.8
Models with
option K
Fig. 10
Plugged connector for RCM300 with option K
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RCM300 Series
Dual Output DC-DC Converter
SAFETY AND INSTALLATION INSTRUCTION
Connectors and Pin Allocation of RCM300
- Input connector, 3 pins: Wago 745-353: PE, Vi-, Vi+,
wire section: 0.2 – 6 mm 2, 24 – 10 AWG
with option K: Weidmüller 1048500000
- Output connector, 2 pins: Wago 745-3104, Vo-, 0 V, 0 V, Vo+
wire section: 0.2 – 4 mm2, 24 – 12 AWG
with option K: Weidmüller 1048390000
- Auxiliary connector: Phoenix Contact 1874027;
pin allocation see Fig. 11.
OUTPUT
-24V 0V 0V +24V
SIGNALS
OK_A N/A SD
OK_B N/A SD0
PE
INPUT
VIN- VIN+
Fig. 11
Pin allocation of RCM300
Installation Instruction
These converters are components, intended exclusively for inclusion by an industrial assembly process or by a professionally
competent person. Installation must strictly follow the national safety regulations in respect of the enclosure, mounting, creepage
distances, clearances, markings and segregation requirements of the end-use application.
Connection to the system shall only be effected with cables with suitable wire section.
The auxiliary connector shall be connected via the suitable female connector; see Accessories.
Other installation methods may not meet the safety requirements. Check that PE is safely connected to protective earth.
No fuse is incorporated in the converter (except for option F). An external circuit breaker or a fuse in the wiring to one or both
input pins.
Do not open the converters, or the warranty will be invalidated. Make sure that there is sufficient airflow available for convection
cooling and that the temperature of the bottom plate is within the specified range. This should be verified by measuring the case
temperature at the specified measuring point, when the converter is operated in the end-use application. TC max should not be
exceeded. Ensure that a failure of the converter does not result in a hazardous condition.
Standards and Approvals
The RCM Series converters are approved according to the last edition of IEC/EN 62368-1 and UL/CSA 62368-1.
They have been evaluated for:
• Class I equipment
• Building in
• Double or reinforced insulation based on 250 VAC or 240 VDC between input and output, and between input and the relay
contacts (OK, OK0)
• Pollution degree 2 environment.
The converters are subject to manufacturing surveillance in accordance with the above mentioned safety standards and with ISO
9001:2015, IRIS ISO/TS 22163:2017 certified quality and business management system..
Cleaning Liquids and Protection Degree
The converters are not hermetically sealed. In order to avoid possible damage, any penetration of liquids shall be avoided.
The converters correspond to protection degree IP 30.
Railway Applications
The RCM Series converters have been designed observing the railway standards EN 50155:2021, EN 50121-3-2:2016,
EN 50124-1:2017 and AREMA. All boards are coated with a protective lacquer.
The converters comply with the fire & smoke standard EN 45545:2016, HL1 to HL3.
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RCM300 Series
Dual Output DC-DC Converter
Insulation Test
The electric strength test is performed in the factory as routine test in accordance with EN 62911, EN 50155:2021 and AREMA.
It should not be repeated in the field, and the Company will not honor warranty claims resulting from incorrectly executed electric
strength tests.
Table 10: Isolation
Characteristics
Input to
Output 1
Input to
Case
Output
to Case
Input
Case
Outputs
Voltage withstand levels (tested acc. to IEC 62368-1) -RCM150
4.2
2.12
1.0
2.86
N/A 3
N/A 3
kVDC
Voltage withstand levels (tested acc. to IEC 62368-1) -RCM300
4.2
2.86
1.0
2.86
N/A
N/A
3
kVDC
Voltage withstand levels (designed to meet AREMA and factory tested)
4.2 1
2.86
2.86
2.86
2.86
2.86
kVDC
Insulation resistance
>300
>300
>300
>300
>300
>300
MΩ
5.0
3.5
3.5
3.5
3.5
3.5
mm
Creepage distances
2
OK contacts to
3
Unit
Pretest of subassemblies in accordance with IEC/EN 62368-1
Tested at 500 VDC
3
No safety isolation requirements applicable between OK contacts to chassis and OK contacts to output per IEC 62368-1
1
2
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RCM300 Series
Dual Output DC-DC Converter
ACCESSORIES
Female Connectors
A suitable female auxiliary connector (Phoenix Contact 1790302) is available (Fig. 12), wire section: 0.2 – 1.5 mm2, 24 – 16 AWG.
Fig. 12
Female connector 6 pins (Phoenix Contact 1790302)
For converters with option K, use connectors in Fig. 13:
• HZZ02020 (3 poles, Weidmüller 1060640000), wire section: 0.5 – 10 mm 2, 24 – 8 AWG
• HZZ00151-G (4 poles, Phoenix Contact 1942280), wire section: 0.2 – 2.5mm 2, 24 – 12 AWG
Fig. 13a
Female connector for option K, 3 poles (HZZ02020)
Fig. 13b
Female connector for option K, 4 poles (HZZ00151-G)
DIN-Rail Mounting Bracket DMB
A suitable DIN-Rail mounting bracket HZZ00625-G is available, see Fig. 14.
Fig. 14
DIN-Rail mounting bracket for RCM series HZZ00625-G
NUCLEAR AND MEDICAL APPLICATIONS - These products are not designed or intended for use as critical components in life support systems,
equipment used in hazardous environments, or nuclear control systems.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the
date manufactured. Specifications are subject to change without notice.
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