System terminal, surge filter system and field supply KL9550
Power LED
Power LED
Power contact
Power contact
Output +24 V
+24 V
0 V
Input +24 V
Output 0 V
+24 V
0 V
0 V
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range 25g

KL9550 | System terminal, surge filter system and field supply

The KL9550 system terminal contains an overvoltage filter for the 24 V field and system supply. The filter protects the Bus Terminal from line-bound surge voltages that can occur due to high-energy disturbances such as switching overvoltages at inductive consumers or lightning strikes at the supply lines. The KL9550 protects the Bus Terminal station from damage in particularly harsh environments. The ship classification organisations require the use in shipbuilding applications and in the onshore/offshore sector.

Technical data KL9550 | KS9550
Nominal voltage 24 V DC (-15 %/+20 %)
Surge filter field supply yes
Surge filter system supply yes
Rated current field supply ≤ 10 A
Rated current system supply ≤ 0.5 A
PE connection
Weight approx. 50 g
Operating/storage temperature -25…+60 °C/-40…+85 °C
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Pluggable wiring for all KSxxxx Bus Terminals
Approvals/markings CE, UL, ATEX, GL
Ex marking II 3 G Ex nA IIC T4 Gc
Related products
KL9540 Surge filter field supply
KL9540-0010 surge filter field supply for analog terminals