c) Data sheet – 4 wire data protocol 

VM-RS 485 has been designed to protect all versions of RS 485. It can be used for protection of RS 422 and V.11 protocol as well.

• Category IEC / EN: D1/C1/C2/C3
• Mode of protection: Longitudinal, Transverse
• Coarse Protection: 2 x 3 terminal GDT, 2 x 2 terminal GDT 
• Nominal operating voltage: Un: 5VDC
• Max. operating voltage: Uc: 6VDC
• Serial resistance: 1.7 – 1.9Ω per line
• Frequency range: < 1Mhz
• Surge Discharge Ratings: In: 20kA; Iimp 10/350 :  2.5kA 
• Series load current: 500mA
• Enclosure: DIN 43880 2TE, DIN rail mount
• Terminals: Stranded 2 x 2.5mm2
• Housing: 16 terminal compact design
• Complies with: IEC/EN 61643-21