Power supplies
7.3 Buffer module
B&R offers buffer modules to bridge temporary power failures and handle longer power failures.
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Buffering for 24 VDC consumers
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Output current up to 20 A
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Can be switched parallel for larger buffer currents and times
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Easy to connect in parallel to the power supply or to the load in the 24 VDC circuit
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Simple and problem-free retrofitting of existing systems
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Industrial-grade since capacitor-based energy storage (no accumulators)
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High MTBF (>500,000 h)
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International approval package
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Wide temperature range from -25 to 70°C
Function principle and application
The buffer module is an accessory for regulated 24 VDC power supplies. The energy from the DC circuit is stored
in capacitors and then used in the event of a power failure or to handle overloads. Machines and systems can be
easily equipped with this buffer module for use worldwide in unstable power circuits. With buffering times less than
4 seconds, this is an ideal alternative to a DC UPS (less expensive, requires less space and maintenance-free).
When short-term current peaks occur, it provides the required energy, therefore preventing the otherwise common
error of overdimensioning the power supply.
Protection during power supply failures
Statistics show that 80% of all power failures occur in 0.2 seconds or less. These power failures are completely
bypassed and do not affect the DC voltage, which increases the reliability and availability of the complete system.
After a power failure or shutdown, the buffer module delivers the load current for a specified amount of time and
reports the loss of power via signal terminals. Process data can be saved and processes terminated before the
DC voltage is switched off. It is then possible to perform a controlled restart.
Easy to operate, expandable and maintenance-free
Buffer
module(s)
Load
Power
supply
The buffer module does not require any control lines. It can be connected in parallel at any location in the load
current circuit. Five buffer modules can be connected in parallel for redundancy or to extend the buffering time.
The double terminals allow easy wiring.
7.3.1 Order data
Order number Short description Figure
Buffer module
0PB0200.1 24 VDC buffer module, 0 to 20 A, buffer time 0.2 s at 20 A to 4
s at 1 A, top-hat rail installation
Table 11: 0PB0200.1 - Order data
Installation / EMC guide 1.36 (April 2021) 37
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