Warning
If a coil containing device is connected, e.g. a relay / electromagnetic lock, it is
necessary to protect the intercom output against voltage peak while switching
off the induction load. For this way of protection, we recommend a 1 A / 1000
V diode (e.g., 1N4007, 1N5407, 1N5408) connected antiparallel to the device.
2N TELEKOMUNIKACE a.s., www.2n.cz
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