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Safety lighting systems In safety lighting systems, loads are supplied with a.c.
voltage during normal operation and with battery-operated
d.c. voltage during emergency operation. Since surges may
occur during both operating states, DEHNsecure M 1 242
(FM) arresters are suited for direct and alternating currents.

DEHNsecure M 1 242 (FM) Technical data

SPD classification according to EN 61643-11 type 1
Type Part No. Max. continuous operating voltage (d.c.) U C 242 V
DSE M 1 242 (FM) 971 122 (971 127) Lightning impulse current (10/350 µs) I imp 25 kA
Voltage protection level U < 2.5 kV
P
Maximum direct current 2000 A
For d.c. and a.c. operation yes
Max. continuous operating voltage (a.c.) U C 253 V
Maximum backup fuse (a.c.) 10 A gL/gG

DEHNsecure

AC/DC
Lightning equipotential bonding,
lightning current arrester / combined arrester
Lightning Protection Zone

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