PISA-M-4ADJ
PISA-M-40X

ELECTRONIC CIRCUIT BREAKER
4 X 24/12 V 1-8 A
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PRODUCT DESCRIPTION

4 current controlled output channels
Fully adjustable and fixed output current versions
Selective tripping of overloaded output channels
Compatible even with large capacitive loads
24 V and 12 V operation
Width only 22.5 mm
Protection function in case of PSU overload
Local control and reset via push buttons
Configurable signaling and communication interface
ON/OFF feature for each individual output channel
Easy wiring via push-in terminals
3 year warranty

SHORT-FORM DATAThe PISA-M devices are miniature 4-channel protection
modules for 24 V and 12 V systems providing all benefitsof electronic circuit breakers in a tiny DIN rail mountablehousing: Fully adjustable current tripping setpoints for 4
independent output channels in one device – including
selection of tripping characteristic combined with different
options for remote signaling and communication, enabling
remote configuration, monitoring and control.
The PISA-M supports multiple, user-selectable, signaling
and communication methods, allowing the selection of
simple alerts and reset function.
All PISA-M devices are equipped with push-in terminals,
which are optimised for automated wiring and allow fastand safe installation.

Input voltage

DC 24 VDC 12 V

Input current
Internal
consumption

max. 20 A
30 mA at 24 V
20 mA at 12 V
1/2/3/4/6/8 A
2/4/6/8 A

Output current
tripping setpoint
per channel
Tripping
characteristics
Tripping delay

slow or fast
< 2 ms0.22 s< 10 ms
1.1 s

Max. capacitive
load

40 mF

Efficiency> 99 % at 24 V
> 98 % at 12 V

- 20 % / + 25 %- 20 % / + 25 %adjustable (PISA-M4ADJ)
fixed (PISA-M-40x)
selectable
at short circuit
for fast tripping at 1.5 x
tripping setpointat short circuit
for slow tripping at 1.5 x
tripping setpoint
at 8 A, 24 V, slow
tripping characteristic

Signaling andCommunication

ORDER NUMBERS
Electronic Circuit Breaker
PISA-M-4ADJ
4 adjustable output channels 1-8 A
PISA-M-402
4 x 2 A fixed output channels
PISA-M-404
4 x 4 A fixed output channels
PISA-M-406
4 x 6 A fixed output channels
PISA-M-408
4 x 8 A fixed output channels
Accessory
ZM3.WallWall mounting bracket

Output channel status
Remote output channel reset
Digital Coded Interface
Temperature range -25 °C to +70 °C
Size (w x h x d)
22.5 x 104 x 98 mm without DIN rail
Weight100 gwithout accessories

MAIN APPROVALS
For details and the complete approval list, see chapter 22.

UL 61010-2-201 planned

UL 2367 planned

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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Index
Page
1. Intended Use .......................................................3
2. Installation Instructions ......................................3
3. Typical Wiring Scheme ........................................4
4. DC Input ...............................................................5
5. DC Output............................................................6
6. Tripping Characteristics ......................................7
7. Charging of Capacitive Loads .............................8
8. Fail-Safe Master Switch .......................................9
9. Power Supply Overload Protection ....................910. Device Overcurrent Protection .........................10
11. Signal Status Output and Control Input ..........10
12. Functional Diagram...........................................11
13. Terminals and Wiring ........................................12
14. Front Side and User Elements ...........................13Page
15. PISA-M Local User Interface: Access Data and
Set Configuration .................................................... 14
16. Digital Coded Interface .................................... 14
17. Lifetime Expectancy ......................................... 16
18. MTBF ................................................................. 16
19. EMC ................................................................... 17
20. Environment ..................................................... 18
21. Safety and Protection Features........................ 19
22. Approved, Fulfilled or Tested Standards......... 20
23. Regulatory Product Compliance ...................... 20
24. Physical Dimensions and Weight ..................... 21
25. Accessory ........................................................... 2225.1. ZM3.Wall mounting bracket .................... 22

The information given in this document is correct to the best of our knowledge and experience at the time of
publication.
If not expressly agreed otherwise, this information does not represent a warranty in the legal sense of the word. As
the state of our knowledge and experience is constantly changing, the information in this data sheet is subject torevision. We therefore kindly ask you to always use the latest issue of this document (available underwww.pulspower.com).
No part of this document may be reproduced or utilised in any form without our prior permission in writing.
Packaging and packaging aids can and should always be recycled. The product itself may not be disposed of as
domestic refuse.

Terminology and Abreviations
t.b.d.

To be defined, value or description will follow later.

DC 24 VA figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ± 15 %) included.

24 VdcA figure with the unit (Vdc) at the end is a momentary figure without any additional
tolerances included.

may

A key word indicating flexibility of choice with no implied preference.

shall

A key word indicating a mandatory requirement.

shouldA key word indicating flexibility of choice with a strongly preferred implementation.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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1. Intended Use
This device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control,
process control, monitoring and measurement equipment or the like. Do not use this device in equipment, where
malfunctioning may cause severe personal injury or threaten human life without additional appropriate safety devices,that are suited for the end-application.
If this device is used in a manner outside of its specification, the protection provided by the device may be impaired.

2. Installation Instructions
Obey the following installation instructions:This device may only be installed and put into operation by qualified personnel. This device does not contain serviceableparts. If damage or malfunction should occur during installation or operation, immediately turn power off and send unit
to the factory for inspection.
Install the device in an enclosure providing protection against electrical, mechanical and fire hazards. Install the device
onto a DIN rail according to EN 60715 with the input terminals on top of the unit.
Use an appropriately sized 24 V or 12 V power supply, which can deliver the peak current required to trip the load
output channels. If peak currents are too low, the PISA-M will trip output channels in case of voltage drops to protect
the power supply from overload.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that aredesigned for a minimum operating temperature of +60 °C for ambient temperatures up to +45 °C, +75 °C for ambient
temperatures up to +60 °C and +90 °C for ambient temperatures up to +70 °C. Ensure that all strands of a stranded wire
enter the terminal connection.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed. The
enclosure of the device provides a degree of ingress protection of IP20. The housing does not provide protection against
spilled liquids.
The isolation of the devices is designed to withstand impulse voltages up to 1.5 kV according to IEC 60664-1.
The input can be powered from a regulated power supply or a similar DC source.
The input must be powered from a PELV or SELV source in order to maintain a SELV or PELV output. Check for correct
input polarity. The device will not operate when the voltage is reversed.
A disconnecting means shall be provided for the input of the device.
The device is designed as “Class of Protection III” equipment according to IEC 61140.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do notcover ventilation grid!
Keep the following minimum installation clearances: 40 mm on top, 30 mm on the bottom, 0 mm left and right side.
Increase the 0 mm to 15 mm in case the adjacent device is a heat source. Between multiple PISA-M modules no clearance
is needed. The device is designed for altitudes up to 5000 m.
The maximum surrounding air temperature is +70 °C. The operational temperature is the same as the ambient or
surrounding air temperature and is defined 3 cm below the device. The device is designed to operate in areas between
5 % and 95 % relative humidity.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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3. Typical Wiring Scheme
One PISA-M device is suitable to distribute the current to 4 consumers.
The (+) pole terminals of the loads must be connected to the output channels of the PISA-M module.
For distribution of the (-) pole, an external distribution node is required.
If several PISA-M modules are connected to a power supply with nominal current exceeding 20 A, the (-) pole of thepower supply shall be connected directly to the distribution node. The (-) pole of the PISA-M is used for the supply of
PISA-M only.

Fig. 3-1: Standard wiring scheme

Fig. 3-2: Wiring scheme for multiple PISA-M modules
connected to one power supply with nominal output current >20 A

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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4. DC Input
The input can be powered from a regulated power supply or a similar DC source.
The input must be powered from a PELV or SELV source or an “Isolated Secondary Circuit” in order to maintain SELV or
PELV outputs.
Check for correct input polarity. The device will not operate when the voltage is reversed.
Use an appropriately sized power supply, which can deliver the required output current.
Input voltage

nom.

Input voltage ranges

DC 24 VDC 12 V

Turn-on voltage

typ.

19.2 - 30 Vdc
9.6 - 15 Vdc
9.6 Vdc

Turn-off voltage
Input current

typ.
max.

8.8 Vdc
20 A

Internal current consumption

typ.

30 mA at DC 24 V
20 mA at DC 12 V

- 20 % / + 25 %- 20 % / + 25 %at DC 24 V
at DC 12 V
Required input voltage for turning-on the
output channels.
The input current corresponds to the sum
output current and the internal current
consumption.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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5. DC Output
Output voltagenom.

DC 24 V / 12 V

Voltage drop per channel

typ.

130 mV at 8 A

typ.
max.
max.
nom.
nom.
max.
max.
typ.
typ.
max.

130 mV
20 A
8/16 A
1/2/3/4/6/8 A
2/4/6/8 A
40 mF
400 ms
350 ms
100 ms
30 V

Sum current for all channels
Output current tripping
setpoint per channel
Load capacitance capability
Turn-on delay of output
channels
Back-feeding voltage

The output voltage is equal to the input voltage minus thevoltage drop of the module.
if one output channel is loaded and all other channels are
not connected to a load
if all output channels are loaded with 5 A
PISA-M-4ADJ, PISA-M-406, PISA-M-408
PISA-M-402 / PISA-M-404
adjustable for PISA-M-4ADJ only
PISA-M-402 / -404 / -406 / -408
at 24 V, 8 A, slow tripping characteristic, see chapter 7
until all output channels turned on after power-on
until all output channels turned on after power-on
delay between output channels
Do not apply voltages >30 V.

To prevent excessive peak currents on the 24 V or 12 V supply during power up the consumers, the output channels areactivated sequentially with delayed intervals. CH1 activates 50 ms after applying the supply voltage. CH2 – CH4 will
follow with a 100 ms delay for each, see Fig 5-1.

Fig. 5-1: Turn-on sequence after applying supply voltage

Output channels can be switched on and off independently by pushing the Channel Control Button or remotely. The
status of each output channel is shown via the associated LED. Factory setting: All output channels are switched on.
Please consider the following information:• Do not parallel output channels for higher output currents.
• Do not connect output channels in a series connection for higher output voltages.
• Do not connect batteries for charging purposes to the output channels of the device.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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6. Tripping Characteristics
The PISA-M-4ADJ allows individual adjustment of the tripping current on each output channel.
All other PISA-M-40x versions come with four fixed output channels which cannot be adjusted. Please refer to the ordernumbers on page 1.
The tripping characteristics can be uniformly configured as slow or fast for all output channels on all PISA-M versions.
Tripping characteristic
Tripping delay

typ.
typ.
max.
max.

slow / fast
0.22 s
1.1 s
2 ms
10 ms

selectable, factory setting is fast
for all output channels in fast characteristic at 1.5 x tripping setpoint
for all output channels in slow characteristic at 1.5 x tripping setpointin case of short circuit in fast tripping characteristic
in case of short circuit in slow tripping characteristic

The following curves show the let-through current areas, which are located to the left of the curves, and the tripping
areas, which are located to the right of the curves depending on the adjusted or fixed output channel tripping setpoint.

Fig. 6-1: Tripping delay depending on current
fast tripping characteristic

Fig. 6-2: Tripping delay depending on current
slow tripping characteristic

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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7. Charging of Capacitive Loads
Large input capacitors of drives, monitors or other consumers can result in an unintended tripping of the output channel
when trying to turn-on such types of loads. This especially can occur after a reset or by turning on an output channel via
the Channel Control Button or remotely. The PISA-M is designed to be exceptionally compatible with such types of loads.
The permissible capacitor sizes which can be connected to the output channel of the PISA-M depends on:•

Actual load current•

Output channel tripping setpoint•

Tripping characteristics: Slow / Fast

Connecting larger capacitors than those specified below may unintentionally trip the output channels. In cases of
uncertainty or when the input capacitance of your load is unknown, we advise conducting tests with the actual load.
Maximum capacitive loads supported with 24 Vdc operation:
•
•
•
•
•
•

8 A fast tripping, resistive load and capacities up to: 30 mF at 8 A current
6 A fast tripping, resistive load and capacities up to: 20 mF at 6 A current
4 A fast tripping, resistive load and capacities up to: 6 mF at 4 A current
8 A slow tripping, resistive load with capacities up to: 40 mF at 8 A current
6 A slow tripping, resistive load with capacities up to: 40 mF at 6 A current
4 A slow tripping, resistive load with capacities up to: 45 mF at 4 A current

Note: The selected power supply must be able to keep a stable output voltage even with high currents when attachingcapacitive loads to the PISA-M. If the power supply cannot keep a stable output voltage, the max. capacitive loads will
be differing from the charts below.

Fig. 7-1: Typical capacitive loads for slow tripping
characteristic at 24V

Fig. 7-2: Typical capacitive loads for fast tripping characteristic at
24V

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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8. Fail-Safe Master Switch
The electronic circuit breakers from PULS do not include built-in melting fuses as fail-safe backup, but an intelligent failsafe master switch.
The fail-safe master switch is continuously monitoring the total input current and all output currents. If a deviation of ≥1 A is detected between total output and input current for more than 1 s, then a fault is detected, and the fail-safe
master switch disables the PISA-M unit.
The benefits of the fail-safe master switch are the accuracy and protection of lines and devices, as the deviation detection
is related to the actual currents and tripping limitations set by the user. Thus, the effective maximum current for each
output channel in a device failure is limited to the selected tripping limitation + 1 A.

9. Power Supply Overload Protection
The electronic circuit breaker PISA-M offers a power supply overload protection. This means that if an overload occurs at
an output channel, causing the output voltage of the upstream power supply to be affected, a separate circuit quickly
shuts down the overloaded output channel by overriding the tripping characteristics. This rapid protection function
ensures that sensitive devices such as PLCs controllers or sensors continue to be supplied with voltage reliably and without
interruption, avoiding the risk of undervoltage shutdown for these kinds of devices.
The activation thresholds for the power supply overload protection shutdowns depend on the nominal supply voltage:
Activation threshold
Reaction time

typ.
typ.
typ.
typ.

10 V
20 V
0.4 ms2.0 msat DC 12 V
at DC 24 V
at high sensitivity
at low sensitivity

To ensure high flexibility for different types of loads, the sensitivity of the Power Supply Overload Protection can be
configured.
The following modes are available:
High sensitivity (factory setting)This mode is recommended for sensitive loads such as PLC controller or sensors. The overloaded output channel will trip
if the supply voltage falls below the activation threshold for > 0.4 ms.
Low sensitivity
This mode is recommended for capacitive loads and devices which are not sensitive to short voltage drops. The
overloaded output channel will trip if the supply voltage falls below the activation threshold for > 2 ms.
Disabled
The Power Supply Protection Mode can be turned off.
Use this mode for huge capacitive loads and devices which are not sensitive to supply voltage dips.
Note: The Power Supply Overload Protection serves as a fault-back protection feature, it does not replace the necessity
for proper system design, including:•Choosing a power supply with sufficient power reserves.
PULS recommends the usage of PULS power supplies with Easy Fuse Breaking Mode.

•

Selecting appropriate wire cross-sections.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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10. Device Overcurrent Protection
The PISA-M comes with a built-in safeguard mechanism to prevent overcurrent. It constantly monitors all output channel
currents. If the total current exceeds the rated maximum of 20 A for 2 s or more, the device will reduce the total output
current by switching of output channels, starting with overloaded output channels, then continuing with CH4 to CH1
until the total output current is 20 A or less.
This protection sequence is handled independently from selected fast or slow tripping characteristic or configured
current limit.
All output channels tripped by this device protection mechanism will be indicated by continuous red double-flashing of
the output channel status LED.

11. Signal Status Output and Control Input
The device is equipped with two signal ports: Signal status output (pin 3.1 - 3.2) and signal control input (pin 3.3 - 3.4).
The ports are galvanically isolated from the power circuits via optocouplers.

Fig. 11-1: Signaling interface using optocouplers

Signal Status Output (3.1 – 3.2)
The device is equipped with an electronical status output switch which provides information about the output channel
status of the PISA-M module.
Signal output voltage ratings
Signal output current rating
Isolation voltage

min.
0 Vdc
max.
35 Vdcmax.
10 mA
see chapter 21

The electronical status switch can be configured with options:
Option 1:
Option 2:
Option 3:
Option 4:

Switch closes if one or more output channels are tripped by overcurrent (factory setting).
Digital Coded Interface, see chapter 16.
Switch closes if one or more output channels are tripped or turned off manually.
Switch closes if no output channel has tripped and all output channels are turned on.

Note: For detailed instructions on how to configure the status output, see the PISA-M user manual.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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Signal Control Input (3.3 – 3.4)
The device is equipped with a control input for resetting all tripped output channels remotely. Therefore, apply avoltage between 10 and 30 Vdc for longer than 1 s to the status control input.
Reset voltage ratings
Reset delay
Signal input voltage ratings
Signal input current rating
Isolation voltage

min.
max.
min.

10 Vdc30 Vdc1s

Apply the reset voltage for at least this time to turn on
output channels again.

min.
-35 Vdcmax.
35 Vdcmax.
10 mA
see chapter 21

Note: The signal control input and status output ports can be configured as a Digital Coded Interface, see chapter 16
and user manual.

12. Functional Diagram

Fig. 12-1: Functional diagram

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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13. Terminals and Wiring
The terminals are IP20 finger safe and suitable for field- and factory wiring. All terminals are facing to front.

Type
Solid wire
Stranded wire
Stranded wire with ferrules without
isolation
Stranded wire with ferrules withisolation
American wire gauge
Max. wire diameter (including ferrules– cramped ferrules shall be round or
square, but not flattened or similar)
Wire stripping length
Ferrule length (ferrules without
isolation)
Ferrule length (conducting part for
ferrules with isolation)
Screwdriver

Input Terminals
push-in terminals
max. 2.5 mm²
max. 2.5 mm²
max. 2.5 mm²

Output Terminals
push-in terminals
max. 2.5 mm²
max. 2.5 mm²
max. 2.5 mm²

Signal Terminals
push-in terminals
max. 1.5 mm²
max. 1.5 mm²
max. 1.5 mm²

max. 1.5 mm²

max. 1.5 mm²

max. 0.75 mm²

AWG 12
2.5 mmAWG 12
2.5 mmAWG 160.75 mm

10 mm
10 mm

10 mm
10 mm

10 mm
10 mm

10 mm

10 mm

10 mm

3 mm slotted to open
the spring(0.5 x 3.0 mm)

3 mm slotted to open
the spring(0.5 x 3.0 mm)

2.5 mm slotted to open
the spring(0.4 x 2.5 mm)

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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14. Front Side and User Elements
A Input Terminals
Identical poles are internally connected.
(+) 1.1
Positive input pole(-) 1.2, 1.3 Negative input pole
B

Output Terminals(+) 2.1 Channel 1 positive output pole(+) 2.2 Channel 2 positive output pole(+) 2.3 Channel 3 positive output pole(+) 2.4 Channel 4 positive output poleC

Control Signal Input(+) 3.1 Signal input positive pole(-) 3.2 Signal input negative pole
Signal input can be used to send reset signal (1 s active) orfor data communication using Digital Coded Interface.

D Status Signal Output(+) 3.3 Signal output positive pole(-) 3.4 Signal output negative pole
Signal output can be set to several operation modes.
E

Channel Control Buttons
 Press of single button to toggle selected output channel ON / OFF
Required duration of button-press can be configured
 Long press of single button to reset selected channel
 Press of button combinations to enter configuration modes
Note: See user manual for more information

F

Output Channel Status LEDs•
Green: Output channel ON•
Yellow: Output channel overload – prewarning before tripping
channel•Red: Output channel turned OFF (manually or remotely)•
Red (flashing): Output channel tripped due to overload of thischannel•Red (double-flashing): Output channel tripped due to device
overload protection or power supply protection, see chapter 9
and 10•
LED OFF: Device is not powered
Note: For other blinking codes, see user manualG

QR code for direct access to documentation

Fig. 14-1: Front side

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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15. PISA-M Local User Interface: Access Data and Set Configuration
The PISA-M allows users to customise settings through its local user interface. Configurable options include:•

Output current tripping setpoint per channel (only for PISA-M-4ADJ): 1/2/3/4/6/8 A•

Tripping characteristic: Slow / Fast•

Button reaction style: Standard (quick-press) and long-press•

Communication•

Power supply voltage protection: high sensitivity / low sensitivity / disabled

Additionally, the local user interface of the PISA-M provides access to the following data:•

Actual output current tripping setpoint per channel•

Output channel status

Note: See PISA-M user manual for detailed instructions on accessing data and modifying the device configuration.

16. Digital Coded Interface
PISA-M features an easy and efficient communication via Digital Coded Interface (DCI), which allows an unidirectionaland bidirectional communication via digital I/O of a PLC.
Note: The communication mode needs to be configured to DCI, as defined in the user manual.
Unidirectional Communication (factory setting)
Unidirectional communication transmits the status of each individual output channel. The status only differentiates
between tripped output channels (high level) and not tripped output channels (low level). Not tripped output channels
can be either on or off.
Each data sequence starts with a 200 ms start bit, followed by a 100 ms pause and 100 ms status signal. The statuses ofthe output channels 1 to 4 are transmitted in order, resulting in a total sequence duration of 1100 ms.

Fig. 16-1: Digital Coded Sequence (unidirectional) – PISA-M to PLC

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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Bidirectional Communication
The bidirectional communication mode enables extended functions. In addition to transmitting tripped output channels,
the channels can also be remotely turned off and on. This also expands the scope of information transmitted by thedevice in the data sequence:•

The transmitted data sequence starts with a 150 ms start bit followed by a 100 ms pause.

•

Tripped output channels are indicated by a high-level state lasting 100 ms.

•

Output channels that are turned off are signaled with a high-level duration of 50 ms.

•

Conversely, output channels that are turned on are indicated by a low-level duration of 100 ms.

Fig. 16-2: Digital Coded Sequence (bidirectional) PISA-M to PLC (top) and PLC to PISA-M (bottom)

To enable the bidirectional mode, a data sequence as defined in Fig. 16.2 must be transmitted to the PISA-M. The module
autonomously identifies incoming communication and switches to bidirectional mode.
Note: The PISA-M switches directly to bidirectional mode after receiving the first sequence.
Power shortages or switching the power off and on will reset the DCI back to unidirectional mode. Sending acorrect data sequence to the PISA-M will enable the bidirectional mode again.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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17. Lifetime Expectancy
The lifetime expectancy shown in the table indicates the minimum operating hours (service lifetime) and is mainly
determined by the lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified inoperational hours and is calculated according to the capacitor’s manufacturer specification.
Note: The manufacturer of the electrolytic capacitors only guarantees a maximum lifetime of up to 15 years (131 400 h).
Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
Lifetime expectancy

268 000 h
268 000 h

at 24 V, 4 x 5 A, ambient temperature +40 °C
at 12 V, 4 x 5 A, ambient temperature +40 °C

18. MTBF
MTBF stands for Mean Time Between Failures, which is calculated according to statistical device failures, and indicatesreliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily
represent the lifetime of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000 hmeans that statistically one unit out of 10 000 installed units will fail every 100 hours. However, it can not be determined
if the failed unit has been running for 50 000 h or only for 100 h.
For these types of units the MTTF (Mean Time To Failure) value is the same value as the MTBF value.
MTBF SN 29500, IEC 61709

MTBF MIL HDBK 217F

1 142 000 h
2 016 000 h
1 281 000 h
2 262 000 h
409 000 h
556 000 h
85 000 h
112 000 h
425 000 h
576 000 h
88 000 h
115 000 h

at 24 V, 4 x 5 A and +40 °C
at 24 V, 4 x 5 A and +25 °C
at 12 V, 4 x 5 A and +40 °C
at 12 V, 4 x 5 A and +25 °C
at 24 V, 4 x 5 A and +40 °C, Ground Benign GB40
at 24 V, 4 x 5 A and +25 °C, Ground Benign GB25
at 24 V, 4 x 5 A and +40 °C, Ground Fixed GB40
at 24 V, 4 x 5 A and +25 °C, Ground Fixed GB25
at 12 V, 4 x 5 A and +40 °C, Ground Benign GB40
at 12 V, 4 x 5 A and +25 °C, Ground Benign GB25
at 12 V, 4 x 5 A and +40 °C, Ground Fixed GB40
at 12 V, 4 x 5 A and +25 °C, Ground Fixed GB25

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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19. EMCThe EMC behaviour of the device is designed for applications in industrial environment as well as in residential,commercial and light industry environment without any restrictions.
The device complies with EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4. The device complies with FCC Part 15
rules. Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) thisdevice must accept any interference received, including interference that may cause undesired operation.
EMC immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)
Surge voltage on
input lines

Power lines and housing
contact discharge
EN 61000-4-2
air discharge
EN 61000-4-3
80 MHz-6 GHz
input lines
EN 61000-4-4
output lines(+) → (−)
EN 61000-4-5(+) / (−) → PE (DIN rail)

Surge voltage on
output lines

EN 61000-4-5(+) → (−)(+) / (−) → PE (DIN rail)

Conducted disturbanceEN 61000-4-6

0.15-80 MHz

EMC immunity
Electromagnetic RF field
Fast transients (Burst)
Surge
Conducted disturbance

Signal lines and housing
EN 61000-4-3
80 MHz-6 GHz
EN 61000-4-4
with coupling clamp
EN 61000-4-5
signal lines → PE (DIN rail)
EN 61000-4-6
0.15-80 MHz

8 kV
8 kV
10 V/m
2 kV
2 kV
500 V
1 kV

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion B

500 V
1 kV
10 V

Criterion B

10 V/m
2 kV
1 kV
10 V

Criterion A
Criterion A
Criterion B
Criterion A

Criterion A

Performance Criterions:
A: The device shows normal operation behaviour within the defined limits.
B: The device operates continuously during and after the test. During the test minor temporary impairments may occur,
which will be corrected by the device itself.
EMC emissions
Conducted emission

Radiated emission

Switching frequencies
Microcontroller
Internal auxiliary voltage

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1

input lines
output lines
signal lines

EN 55011, EN 55032, CISPR 11,
CISPR 32

16 MHz
100 kHz

Limits for DC power ports fulfilled.
Limits for DC power ports fulfilled.
Limits for wired network ports
fulfilled.
Class B

fixed frequency
fixed frequency

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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20. Environment
Operational temperature

Storage temperature
Output derating

Humidity
Atmospheric pressure
AltitudeDegree of pollution
Vibration sinusoidal

Shock

The operational temperature is the ambientor surrounding temperature and is definedas the air temperature 3 cm below thedevice.
- 25 °C to + 85 °C
for storage and transportation
No derating in standard mounting
1.25 A / 1000 m ororientation below 2000 m altitude.
5 °C / 1000 m
For altitudes > 2000 m, see Fig. 20.2 fordetails.
The derating is not hardware controlled. The user has to take this into consideration tostay below the derated current limits in order not to overload the unit.
5 to 95 % r.H.
IEC 60068-2-30
110-54 kPa
see Fig. 20.2 for details
0 to 5000 m
see Fig. 20.2 for details
2
IEC 62103, EN 50178, not conductive
2-17.8 Hz: ± 1.6 mm;
according to IEC 60068-2-6
17.8-500 Hz: 2 g
2 hours / axis
30 g 6 ms, 20 g 11 ms, 10 g 16 ms
according to IEC 60068-2-27
3 shocks per direction,
18 bumps in total
Shock and vibration is tested in combination with DIN rails according to EN 60715 with aheight of 15 mm and a thickness of 1.3 mm.
- 25 °C to + 70 °C

Fig. 20-1: Output current vs. ambient temperature

Fig. 20-2: Output current vs. altitude

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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21. Safety and Protection Features
Isolation resistance
Isolation voltage
Class of protection
Degree of protection
Overtemperature protection
Input overvoltage protection
Reverse polarity protection; input
voltage
Touch current (leakage current)> 10 MOhm
500 Vac
500 Vac
III
IP20
not included
max. 31.4 V
not included

at delivered condition between power port andsignals, measured with 500 Vdc
power ports to signal ports
power ports / signal ports to housinga PE (Protective Earth) connection is not required
according to EN/IEC 60529

no harm or defect of the unit
make sure that the input voltage polarity is correct
before applying the input voltage
The leakage current which is produced by the module itself depends on the input
voltage ripple and need to be investigated in the final application. For a smooth DC
input voltage, the produced leakage current is less than 100 μA.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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22. Approved, Fulfilled or Tested Standards
UL 61010-2-201

UL Certificate
Listed equipment for category NMTR - Electrical Equipment
for Measurement, Control and Laboratory Use - Particularrequirements for control equipment
Applicable for US and Canada
E-File: E198865
UL Certificate
Recognized component for category QVRQ - UL 2367
Standard for
Solid State Overcurrent Protectors
Applicable for US
E-File: E342020

plannedUL 2367
planned23. Regulatory Product Compliance
EU Declaration ofConformity

REACH Regulation (EU)

WEEE Directive

The CE mark indicates conformance with the- EMC directive- ATEX directive- RoHS directive
Manufacturer's Statement
EU regulation regarding the Registration, Evaluation,
Authorisation and Restriction of Chemicals (REACH) fulfilled.
Manufacturer's Statement
EU-Regulation on Waste Electrical and Electronic Equipment(WEEE)
registered in Germany as business to business (B2B) products.
WEEE Reg.-Nr. DE 555837529

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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24. Physical Dimensions and Weight
Plastic housing with DIN rail mount. Housing in black colour.
Width
HeightDepth

WeightDIN rail
Installation clearances
Penetration protection

Fig. 24-1: Front view

22.5 mm
104 mm
98 mm
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.
100 g
Use 35 mm DIN rail according to EN 60715 or EN 50022 with a height of 7.5 or 15 mm.
see chapter 2
small parts like screws, nuts, etc. with a diameter larger than 4 mm

Fig. 24-2: Side view

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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25. Accessory
25.1.

ZM3.Wall mounting bracket

Available from stock.
Bulk package with 25 pcs.
Short DIN rail element for wall or panel mounting made from high-grade polycarbonate material.
Shipped without screws or further fastening material. Mounting hole diameter: 4.2 mm.

Fig. 25-1: Mechanical dimensions

Note: The picture is for representation only.
Protection module not included.

All parameters are specified at 24 Vdc, 4 x 5A, +25 °C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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