https://www.beckhoff.com/nl-nl/products/i-o/bus-terminals/kl9xxx-system/kl9540.html
KL9540 | System terminal, surge filter field supply | Beckhoff Nederland
The KL9540 system terminal contains an overvoltage filter for the 24 V field supply. The filter protects the Bus Terminal from line-bound surge voltages...
surge filterfield supplysystemterminalbeckhoff
https://www.geappliances.com/appliance/SURGE-FILTER-BOARD-WB27X22116
SURGE FILTER BOARD - WB27X22116 - GE Appliances
GE Appliances is your home for the best kitchen appliances, home products, parts and accessories, and support.
surge filterboardappliances
https://www.selby.com.au/brands/thor/thor-rf11-smart-rack-guard-11.html
Thor RF11 Smart Guard 1RU Powerboard Filter & Surge Protection for 19 Inch Rack | Selby
surge protectionthorsmartguardpowerboard