34
Hazardous area
Safe
 are
a
6.2.5  MTL5524 - Solenoid Alarm driver
Single channel, powered, logic drive with phase reversal 
The MTL5524 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 certified as intrinsically safe or are classified as non-energy-
storing simple apparatus. 
6
5
4
3
2
1
7
8
9
10
11
12
13
14
Solenoid, alarm 
or other IS device
+
–
Vs–
Vs+
20 to 35V dc
+
–
Control
‡
‡ use link to reverse phase
Terminal Function
1 Output –ve
2 Output +ve
8 Phase reversal link
9 Phase reversal link
11 Control –ve
12 Control +ve
13 Supply –ve
14 Supply +ve
 
Figure 6.14: 
Top label  
for MTL5524