25
INM4500-2
Mar 2009
6.2.5 MTL4524 - Solenoid Alarm driver
Swich operated with override, IIC
The MTL4524 enables an on/off device in a hazardous area to be controlled by a volt-free contact
or logic signal in the safe area. It can drive loads such as solenoids, alarms, LEDs and other low
power devices that are certifi ed as intrinsically safe or are classifi ed as non-energy storing simple
apparatus. By connecting a second safe-area switch or logic signal, the output can be disabled to
permit, for example, a safety system to override a control signal.
Note
: Signal plug HAZ1-3 is required for access to the earth leakage detector function.
Figure 6.13
LED indicators
for MTL4524
PWR
STS
MTL4524
Hazardous area
Safe area
1 2 3 4 5 6
7 8 9 10 1112
13 14
Vs+
Vs
2035V dc
+
-
+
-
Control
Override
Solenoid,
alarm or
other IS device
To MTL earth leakage detector
+
Terminal
Function
1
Output
–ve
2
Output
+ve
3
To earth leakage detector*
8
Override
–ve
9
Override
+ve
10
Control
+ve
11
Control
–ve
13
Supply
–ve
14
Supply
+ve
