EFB-Elektronik 1DA Fine Protection with FailSafe, 48 V DC, Data Line Surge Protector, PTC, DIN Rail Mount, Black 46150.48

In industrial automation and building management, a single surge on a data line can bring down critical communication. The EFB-Elektronik 1DA Fine Protection with FailSafe (model 46150.48) is a Type 3 surge protection module engineered for 48 V DC data lines. It combines fine protection with an integrated PTC resettable fuse and a FailSafe function that disconnects the line in the event of a fault, ensuring continuous protection for sensitive equipment.

Key specifications

• Nominal operating voltage: 48 V DC
• Max. continuous operating voltage: 53 V DC
• Number of protected lines: 1 data line (2 wires)
• Nominal discharge current (8/20 µs): 10 kA
• Max. discharge current (8/20 µs): 20 kA
• Voltage protection level: < 600 V
• Response time: < 1 ns
• Overcurrent protection: integrated PTC resettable fuse
• FailSafe function: yes (line disconnection)
• Connection: screw terminals, max. 2.5 mm²
• Mounting: DIN rail TS35
• Housing material: plastic
• Operating temperature: -40 °C to +80 °C
• Standards: IEC 61643-21

Why choose it

This module delivers reliable protection for 48 V DC data lines in harsh environments. The FailSafe feature automatically disconnects the line if the protection circuit is overloaded, preventing damage to downstream devices. The integrated PTC resettable fuse eliminates the need for separate overcurrent protection, simplifying installation and maintenance. Its compact DIN rail design fits standard distribution boards, and the wide operating temperature range makes it suitable for outdoor or unheated locations.

Ideal use cases

• Protecting RS-485 or other 48 V DC data lines in industrial control systems
• Surge protection for building automation networks (e.g., KNX, Modbus)
• Securing telemetry and sensor lines in remote monitoring applications
• Retrofit surge protection in existing DIN rail enclosures

Good to know

The module complies with IEC 61643-21, ensuring tested performance for data line surge protection. It is a single-channel device, so one module protects one data pair. For multiple lines, install one module per line. The screw terminals accept conductors up to 2.5 mm², allowing secure connections in industrial settings. Always follow local electrical codes and install in a suitable enclosure.