The Novaris SL range of signal line protectors provide multistage protection for most physical process control protocols. Their design utilises a gas discharge tube front end to provide 10kA of common mode protection with secondary protection components delivering a very low residual voltage during a surge.
With an electrically sealed width of only 7.5mm per signal pair, the SL enables economical use of cabinet real estate and also accommodates straightforward upgrades of existing feed through terminal block installations. The design is modular with 2 standard bases and a range of pluggable modules appropriate to the physical protocol being protected.
The SL utilises the DIN rail mount as a low impedance earth connection and provides earth/shield terminals for convenient equipment and shield grounding.
The two base options in the SL range are the SLDIN/G (G base) and the SLDIN/EC90 (EC90 base). The G base has a direct connection between the earth provided by the DIN rail, the earth terminals on the unit and the surge protection module earth. The EC90 base contains an isolation gas discharge tube between the shield terminals/surge protection module earth, and the DIN rail.
The EC90 base provides 2 functions:
- Ground Loop Isolation: Isolating the surge protection and shield from the ground prevents current flow on the shield and stray voltages being injected onto the signal pairs.
- Equipment Bonding: During a surge the Gas Discharge Tube will fire, bonding the earths of the two sites together through the larger shield conductor. This reduces the earth potential difference between the sites.
The recommended installation technique is to use G bases for protection of the central marshalling cabinet and EC90 bases for all remote equipment. This ensures the installation feeds from the same earth reference point.
The Novaris SSP6A is a series connected slimline ELV power protection device for load currents up to 6A. These SPDs are designed to provide 9.6kA of common mode and 4.8kA of transverse mode protection utilising MOV technology.
With an electrically sealed width of only 7.5mm per signal pair, the SSP6A enables economical use of cabinet real estate and also accommodates straightforward upgrades of existing feed through terminal block installations.
The SSP6A utilises the DIN rail mount as a low impedance earth connection and provides earth terminals for convenient equipment grounding.
It is recommended to use an EC90 base for the field installation end of the cable to prevent ground loop issues.